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IRAUDAMP7S
25W-500W Scalable Output Power Class D Audio Power Amplifier Reference Design Using the IRS2092S Protected Digital Audio Driver
By Jun Honda, Manuel Rodríguez, Liwei Zheng
CAUTION: International Rectifier suggests the following guidelines for safe operation and handling of IRAUDAMP7S Demo Board: · Always wear safety glasses whenever operating Demo Board · Avoid personal contact with exposed metal surfaces when operating Demo Board · Turn off Demo Board when placing or removing measurement probes
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Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
Table of Contents Introduction of scalable design ........................................................... Power table values for each power model............................................. Specifications................................................................................. Connection setup............................................................................ Test procedure................................................................................ Performance and test graphs............................................................. Clipping characteristics..................................................................... Efficiency....................................................................................... Thermal considerations..................................................................... PSRR, half bridge, full bridge............................................................. Short circuit response....................................................................... IRAUDAMP7S Overview................................................................... Functions Descriptions..................................................................... Selectable dead Time....................................................................... Protection Features.......................................................................... Click and pop noise control................................................................ Bus pumping.................................................................................. Bridged configuration........................................................................ Input signal and Gain....................................................................... Gain settings.................................................................................. Schematics.................................................................................... Bill of Materials................................................................................ IRAUDAMP7S models differential table................................................ Hardware....................................................................................... PCB specifications........................................................................... Assembly Drawings......................................................................... Revision changes descriptions...........................................................
Page 3 4 4-5 6 7 8-13 14 14-16 16 16-17 17-18 18-19 20-22 22 23-25 25 26-27 27 29 29 30-32 33-36 37 38-39 40 41 42
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Introduction
The IRAUDAMP7S reference design is a two-channel Class D audio power amplifier that features output power scalability. The IRAUDAMP7S offers selectable half-bridge (stereo) and full-bridge (bridged) modes. This reference design demonstrates how to use the IRS2092 Class D audio driver IC, along with IR's digital audio dual MOSFETs, such as IRFI4024H-117P, IRFI4019H-117P, IRFI4212H-117P and IRFI4020H-117P, on a single layer PCB. The design shows how to implement peripheral circuits on an optimum PCB layout using a single sided board. The resulting design requires a small heatsink for normal operation (one-eighth of continuous rated power). The reference design provides all the required housekeeping power supplies and protections. Unless otherwise noted, this user's manual is based on 150V model, IRAUDAMP7S-150. Other output power versions can be configured by replacing components given in the component selection of Table 5 on page 36 Applications · · · · · · · AV receivers Home theater systems Mini component stereos Powered speakers Sub-woofers Musical Instrument amplifiers Automotive after market amplifiers
Features Output Power: Residual Noise: Distortion: Efficiency: Multiple Protection Features: Scalable output power from 25W- 500W (see Table 1) 200 V, IHF-A weighted, AES-17 filter 0.007 % THD+N @ 60W, 4 90 % @ 500W, 8 , Class D stage Over-current protection (OCP), high side and low side MOSFET Over-voltage protection (OVP), Under-voltage protection (UVP), high side and low side MOSFET DC-protection (DCP), Over-temperature protection (OTP) Self-oscillating PWM, half-bridge or full-bridge topologies selectable
PWM topology:
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Table 1 IRAUDAMP7S Specification Table Series
Item IR Power FET1A, MOSFET FET1B 8 Half Bridge 4 Full Bridge 8 Nominal +B, -B Supply Voltage Min/Max +B, -B Supply Voltage Voltage Gv Gain Notes: · · All the power ratings are at clipping power (THD+N = 1 %). To estimate power ratings at THD+N=10%, multiply them by 1.33 See Table 5 on page 36 for the complete listing of components table. AMP7S-55 IRFI4024H-117P 25W x 2 50W x 2 100W x 1 ±25V ±20V ~ ±28V 20 Model Name AMP7S-100 AMP7S-150 IRFI4212H-117P 60W x 2 120W x 2 240W x 1 ±35V ±28V ~ ±45V 30 IRFI4019H-117P 125W x 2 250W x 2 500W x 1 ±50V ±45V ~ ±60V 36 AMP7S-200 IRFI4020H-117P 250W x 2 Not Supported Not Supported ±70V ±60V ~ ±80V 40
Specifications
General Test Conditions for IRAUDAMP7S-150 (unless otherwise noted) Power Supply Voltages ± 50V Load Impedance 4 Self-Oscillating Frequency 400kHz Voltage Gain 36 Notes / Conditions
Typical Notes / Conditions IRS2092, Protected digital audio driver IRFI4024H-117P, IRFI4019H-117P, IRFI4212H-117P, IRFI4020H117P Digital audio MOSFETs PWM Modulator Self-oscillating, second order sigma-delta modulation, analog input Power Supply Range ± 45V to ± 60V Or see table 1 above Output Power CH1-2: (1 % THD+N) 300W 1kHz Output Power CH1-2: (10 % THD+N) 400W 1kHz Rated Load Impedance 8-4 Resistive load Standby Supply Current +50 mA/-80 mA No input signal Total Idle Power Consumption 7W No input signal Channel Efficiency 90 % Single-channel driven, 250W IR Devices Used .
Electrical Data
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Audio Performance
THD+N, 1W THD+N, 10W THD+N, 60W THD+N, 100W Dynamic Range Residual Noise Damping Factor Channel Separation Frequency Response : 20 Hz20kHz Before Demodulator 0.01 % 0.005 % 0.005 % 0.007 % 101 dB 200 V 2000 95 dB 85 dB 75 dB 20 Hz-35kHz Class D Output 0.02 % 0.007 % 0.007 % 0.008 % 101 dB 200 V 120 90 dB 80 dB 65 dB ±3 dB Notes / Conditions 1kHz, Single-channel driven A-weighted, AES-17 filter, Single-channel operation 22 Hz 20kHz, AES17 filter Self-oscillating frequency 400kHz 1kHz, relative to 4 load 100Hz 1kHz 10kHz 1W, 4 8 Load
Thermal Performance (TA=25 °C)
Condition Idling 2 ch x 31W (1/8 rated power) 2 ch x 250W (Rated power) Typical TC =30 °C TPCB=37 °C TC =54 °C TPCB=67 °C TC =80 °C TPCB=106 °C Notes / Conditions No signal input
OTP shutdown after 150 s
Physical Specifications
Dimensions Weight 5.7"(L) x 4"(W) x 1.25"(H) 145 mm (L) x 100 mm (W) x 35 mm(H) 0.330kgm
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Test Setup
+B, 5A DC supply -B, 5A DC supply
4 Ohm
G SPK1A CNN1
4 Ohm
SPK1B
LED1 A LED2 A RCA1A
LED1 B S1 LED2 S300 B RCA1B
Audio Signal Fig 1 Typical Test Setup Connector Description
CH1 IN CH2 IN SUPPLY CH1 OUT CH2 OUT RCA1A RCA1B CNN1 SPK1A SPK1B Analog input for CH1 Analog input for CH2 Positive and negative supply (+B / -B) Output for CH1 Output for CH2
Switches Descriptions
S1 S300 Shutdown PWM Half bridge / Full bridge select
Indicator Description
LED1A, B LED2A,B PWM (presence of low side gate signal) Protection
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Test Procedures
Test Setup:
1. On the unit under test (UUT), set switch S1 to OFF and S300 to Stereo positions. 2. Connect 4 -200 W dummy loads to output connectors, SPKR1A and SPKR1B, as shown on Fig 1. 3. Set up a dual power supply ±50V with 5A current limit 4. Turn OFF the dual power supply before connecting to UUT. 5. Connect the dual power supply to CNN1, as shown in Fig 1. Power up: 6. Turn ON the dual power supply. The ±B supplies must be applied and removed at the same time. 7. The red LEDs (Protections) turn ON immediately and stay on as long as S1 is in OFF position. Blue LEDs stay OFF. 8. Quiescent current for the positive and negative supplies must be less than 50mA, while S1 is in OFF position. Under this condition, IRS2092 is in shutdown mode. 9. Slide S1 to ON position; after one second delay, the two blue LEDs turn ON and the red LEDs turns off. The two blue LEDs indicate that PWM oscillation is present. This transition delay time is controlled by CSD pin of IRS2092, capacitor CP3 10. Under the normal operating condition with no input signal applied, quiescent current for the positive supply must be less than 50 mA; the negative supply current must be less than 100 mA.
Switching Frequency Test:
11. With an oscilloscope, monitor switching waveform at test points VS1 & VS2 Adjust P1A & P1B to change self oscillating frequency to 400kHz ± 25kHz. Note: To change self-oscillating switching frequency, Adjust the potentiometer resistances of P11A and P11B for CH1 and CH2 respectively.
Audio Functionality Tests:
12. Set the signal generator to 1kHz, 20 mVRMS output. 13. Connect audio signal generators to RCA1A and RCA1B. 14. Sweep the audio signal voltage from 15 mVRMS to 1 VRMS. 15. Monitor the output signals at SPK1A/B with an oscilloscope. Waveform must be a non distorted sinusoidal signal. 16. Observe 1 VRMS input generates output voltage of 36 VRMS. The ratio, R8/(R7+R2), determines the voltage gain of IRAUDAMP7S. 17. Set switch S300 to Bridged position. 18. Observe that voltage gain doubles.
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Test Setup using Audio Precision (Ap):
19. Use unbalance-floating signal generator outputs. 20. Use balanced inputs taken across output terminals, SPKR1A and SPKR1B. 21. Connect Ap frame ground to GND in terminal CNN1. 22. Place AES-17 filter for all the testing except frequency response. 23. Use signal voltage sweep range from 15 mVRMS to 1 VRMS. 24. Run Ap test programs for all subsequent tests as shown in Fig 2- Fig 13 below.
Test Results
10 5 2 1 0.5 0.2 % 0.1 0.05 0.02 0.01 0.005 0.002 0.001 100m 200m 500m 1 2 W 5 10 20 50 100
Red = CH1, Blue = CH2
±B Supply = ±25V, 4 Resistive Load
Fig 2 IRAUDAMP7S-55, THD+N versus Power, Stereo, 4
.
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10 5 2 1 0.5 0.2 % 0.1 0.05 0.02 0.01 0.005 0.002 0.001 100m 200m 500m 1 2 5 W 10 20 50 100 200
Red = CH1, Blue = CH2
±B Supply = ±35V, 4 Resistive Load
Fig 3 IRAUDAMP7S-100, THD+N versus Power, Stereo, 4
.
10 5 2 1 0.5 0.2 % 0.1 0.05 0.02 0.01 0.005 0.002 0.001 100m 200m 500m 1 2 5 W 10 20 50 100 200 500
±B Supply = ±35V, 8 Resistive Load, Bridged
Fig 4 IRAUDAMP7S-100, THD+N versus Power, Bridged, 8
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.
10 5 2 1 0.5 0.2 % 0.1 0.05 0.02 0.01 0.005 0.002 0.001 100m 200m 500m 1 2 5 W 10 20 50 100 200 500
Red = CH1, Blue = CH2
±B Supply = ±50V, 4 Resistive Load
Fig 5 IRAUDAMP7S-150, THD+N versus Power, Stereo, 4
.
10 5 2 1 0.5 0.2 % 0.1 0.05 0.02 0.01 0.005 0.002 0.001 100m 200m 500m 1 2 5 10 W 20 50 100 200 700
±B Supply = ±50V, 8 Resistive Load
Fig 6 IRAUDAMP7S-150, THD+N versus Power, Bridged 8
.
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.
+4 +2 +0 d B r A -2 -4 -6 -8
-10 20
50
100
200
500
1k
2k Hz
5k
10k
20k
50k
100k 200k
Red Blue
CH1 - 4 , 2 V Output referenced CH1 - 8 , 2 V Output referenced
Fig 8 Frequency Response (All Models) .
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10
T
5 2 1 0.5 0.2 % 0.1 0.05 0.02 0.01 0.005 0.002 0.001 20 50 100 200 500 Hz 1k 2k 5k 10k 20k
Red Blue
CH1, 10W Output CH1, 50W Output
Fig 9 IRAUDAMP7S-150, THD+N versus Frequency, 4 .
+0 -10 -20 -30 -40 d B V -50 -60 -70 -80 -90 -100 -110 20
50
100
200
500 Hz
1k
2k
5k
10k
20k
Red = CH1, Blue = CH2
1V Output
Fig 10 IRAUDAMP7S-150, 1 kHz 1 V Output Spectrum, Stereo
.
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+0 -10 -20 -30 -40 d B V -50 -60 -70 -80 -90 -100 -110 20 50 100 200 500 Hz 1k 2k 5k 10k 20k
1V Output
Fig 11 IRAUDAMP7S-150, 1 kHz - 1V Output Spectrum, Bridged
.
+20 +0 -20 -40 d B V -60 -80 -100 -120 -140 10 20 50 100 200 500 Hz 1k 2k 5k 10k 20k
Red Blue
CH1 - ACD, No signal, Self Oscillator @ 400kHz CH2 - ACD, No signal, Self Oscillator @ 400kHz
Fig 12 IRAUDAMP7S-150 Noise Floor
.
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Clipping characteristics
Red Trace: Total Distortion + Noise Voltage Gold Trace: Output Voltage
210 W / 4 , 1 kHz, THD+N = 0.02 %
310 W / 4 , 1 kHz, THD+N = 10 %
Measured Output and Distortion Waveforms
Fig 13 Clipping Characteristics
.
Efficiency
Figs 14-19 show efficiency characteristics of the IRAUDAMP7S. The high efficiency is achieved by following major factors: 1) Low conduction loss due to the dual FETs offering low RDS(ON) 2) Low switching loss due to the dual FETs offering low input capacitance for fast rise and fall times 3) Secure dead-time provided by the IRS2092, avoiding cross-conduction
100% 90% 80%
Efficiency (%)
70% 60% 50% 40% 30% 20% 10% 0% 0 10 20 30 40 50 60
25V-4ohms
Output power (W)
±B Supply = ±25 V Fig 14 Efficiency versus Output Power, IRAUDAMP7S-55, 4 , Stereo .
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100% 90% 80%
Efficiency (%)
70% 60% 50% 40% 30% 20% 10% 0% 0 20 40 60 80 100 120 140 160 35V-4ohms
Output power (W)
±B Supply = ±35 V Fig 15 Efficiency versus Output Power, IRAUDAMP7S-100, 4 , Stereo .
100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 0 50 100 150 200 250 300
Efficiency (%)
35V-8ohms-Full bridge
Output power (W)
±B Supply = ±35V Fig 16 Efficiency versus Output Power, IRAUDAMP7S-100, 8 , Bridged .
90% 80%
Efficiency (%)
70% 60% 50% 40% 30% 20% 10% 0% 0 50 100 150 200 250 300 50V-4ohms
Output power (W)
±B Supply = ±50V Fig 17 Efficiency versus Output Power, IRAUDAMP7S-150, 4 , Stereo
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.
100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 0 50 100 150 200 250 300 350 400 450 500 550
Efficiency (%)
50V-8ohms-Full bridge
Output power (W)
±B Supply = ±50V Fig 18 Efficiency versus Output Power, IRAUDAMP7S-150, 8 , Bridged .
100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 0 50 100 150 200 250 300
Efficiency (%)
70V-8ohms
Output power (W)
±B supply = ±70V Fig 19 Efficiency versus Output Power, IRAUDAMP7S-200, 8 , Stereo
Thermal Considerations
With this high efficiency, the IRAUDAMP7S design can handle one-eighth of the continuous rated power, which is generally considered to be a normal operating condition for safety standards, without additional heatsink or forced air-cooling.
Power Supply Rejection Ratio (PSRR)
The IRAUDAMP7S obtains good power supply rejection ratio of -65 dB at 1kHz shown in Fig 20. With this high PSRR, IRAUDAMP7S accepts any power supply topology as far as the supply voltages fit in the min and max range.
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Red: VAA & VSS are fed by +/-B bus Green: VAA & VSS are fed by external +/-5 V regulated power supplies. Fig 20 IRAUDAMP7S Power Supply Rejection Ratio
Short Circuit Protection Response
Figs 21-23 show over current protection reaction time of the IRAUDAMP7S in a short circuit event. As soon as the IRS2092 detects over current condition, it shuts down PWM. After one second, the IRS2092 tries to resume the PWM. If the short circuit persists, the IRS2092 repeats try and fail sequences until the short circuit is removed.
Short Circuit in Positive and Negative Load Current
CSD pin
CSD pin
VS pin
Positive OCP
VS pin
Load current
Load current
Negative OCP
Fig 21 Positive and Negative OCP Waveforms
.
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OCP Waveforms Showing CSD Trip and Hiccup
CSD pin VS pin Load current Load current VS pin
CSD pin
.
Fig 22 OCP Response with Continuous Short Circuit .
Actual Reaction Time
OCP Waveforms Showing actual reaction time
.
Fig. 23 High and Low Side OCP current waveform reaction time
IRAUDAMP7S Overview
The IRAUDAMP7S features a self-oscillating type PWM modulator for the lowest component count, highest performance and robust design. This topology represents an analog version of a second-order sigma-delta modulation having a Class D switching stage inside the loop. The
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benefit of the sigma-delta modulation, in comparison to the carrier-signal based modulation, is that all the error in the audible frequency range is shifted to the inaudible upper-frequency range by nature of its operation. Also, sigma-delta modulation allows a designer to apply a sufficient amount of error correction. The IRAUDAMP7S self-oscillating topology consists of following essential functional blocks. · Front-end integrator · PWM comparator · Level shifters · Gate drivers and MOSFETs · Output LPF
Integrator
Referring to Fig 24 below, the input operational amplifier of the IRS2092 forms a front-end secondorder integrator with R7, C4, C6, P1, and R11. The integrator that receives a rectangular feedback signal from the PWM output via R8 and audio input signal via R7 generates quadratic carrier signal in COMP pin. The analog input signal shifts the average value of the quadratic waveform such that the duty cycle varies according to the instantaneous voltage of the analog input signal.
PWM Comparator
The carrier signal in COMP pin is converted to PWM signal by an internal comparator that has threshold at middle point between VAA and VSS. The comparator has no hysteresis in its input threshold.
Level Shifters
The internal input level-shifter transfers the PWM signal down to the low-side gate driver section. The gate driver section has another level-shifter that level shifts up the high-side gate signal to the high-side gate driver section.
Gate Drivers and MOSFETs
The received PWM signal is sent to the dead-time generation block where a programmable amount of dead time is added into the PWM signal between the two gate output signals of LO and HO to prevent potential cross conduction across the output power MOSFETs. The high-side levelshifter shifts up the high-side gate drive signal out of the dead-time block. The IRS2092 drives two MOSFETs, high- and low-sides, in the power stage providing the amplified PWM waveform.
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Output LPF
The amplified PWM output is reconstructed back to analog signal by the output LC LPF. Demodulation LC low-pass filter (LPF) formed by L1 and C12, filters out the Class D switching carrier signal leaving the audio output at the speaker load. A single stage output filter can be used with switching frequencies of 400 kHz and greater; a design with a lower switching frequency may require an additional stage of LPF.
.
R8 R117
+B
CP4
0V
C4 R11 C6
+VAA VB IRS2092 HO
CP6 R24
+B 0V -B LP Filter
FET1 IRFI4024H-117P IRFI4212H-117P IRFI4019H-117P IRFI4020H-117P D3 L1 C12
COMP
C7
0V
R7
INPUT
INGND
0V
+
.
Modulator and Shift level Integrator
VS VCC LO
.
R25
CP2
CP5
-VSS
COM
+VCC
-B
R118
.
Fig 24 Simplified Block Diagram of IRAUDAMP7S Class D Amplifier
Functional Descriptions
IRS2092 Gate Driver IC
The IRAUDAMP7S uses IRS2092, a high-voltage (up to 200 V), high-speed power MOSFET driver with internal dead-time and protection functions specifically designed for Class D audio amplifier applications. These functions include OCP and UVP. The IRS2092 integrates bidirectional over current protection for both high-side and low-side MOSFETs. The dead-time can be selected for optimized performance according to the size of the MOSFET, minimizing deadtime while preventing shoot-through. As a result, there is no gate-timing adjustment required externally. Selectable dead-time through the DT pin voltage is an easy and reliable function which requires only two external resistors, R26 and R27 as shown on Fig 25 below.
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The IRS2092 offers the following functions. · PWM modulator · Dead-time insertion · Over current protection · Under voltage protection · Level shifters Refer to IRS2092 datasheet and AN-1138 for more details.
VS1
Feedback
R8 *120k 1% RCA1 RCA1 CP1 22uF R2 330 C2 1nF CP4 Z103 5.6V R14 4.7k RED PROT CSD1 3 FET2 BS250F R3 SD D1 100R CP3 Z104 5.6V R118 *3.3k 1W 10uF 6 CP2 22uF R13 10k 8 R12 *7.5k OCSET IRS2092S DT 9 R26 10k R27 10k CP5 22uF 7 VSS VREF LO COM 11 10 2 C4 C6 1 1nF 1nF 22uF 2K POT P1 +VAA 1 R11 100R 3 C7 1nF 4 5 INCOMP CSD HO VS VCC 14 13 12 D3 2 VAA GND CSH VB 16 15 R7 *3.01K 1% U1 R22 10k R117 *3.3k 1w R17
+B
*47k R18 *9.1k R19 10k CP6 22uF D4 C9 FET1 *IRFI4019H-117P 5 HS1 R29 150pF,250V
+B C11 0.1uF,100V C10 CP8 *470uF,100V
R1
100k
0.1uF,400V
R24 20R
+B L1 22uH CH_OUT *MUR120RLG D5 C12 0.47uF, 400V *470uF,100V 0.1uF,100V CP7 R30 10, 1W D6 R31 2.2k
4 3 R28
10R
CH1 OUT
SPKR1 1 2
R20 4.7R R25 20R LED1 Blue 2 R114 *1k 1W R115 1 *15k 1 2
10R
+ CH1 -
150pF,250V
-B *MUR120RLG C13 0.1uF, 400V
R21 10R VCC 3 TIP31C Q105 Z102
R23 10k
-B CP101
15V 22uF
Fig 25 System-level View of IRAUDAMP7S Self-Oscillating Frequency
Self-oscillating frequency is determined by the total delay time along the control loop of the system; the propagation delay of the IRS2092, the MOSFETs switching speed, the time-constant of front-end integrator (P1, R7, R11 R8, C4, C6, C7). Variations in +B and B supply voltages also affect the self-oscillating frequency. The self-oscillating frequency changes with the duty ratio. The frequency is highest at idling. It drops as duty cycle varies away from 50%.
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C14 -B
C8
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Adjustments of Self-Oscillating Frequency
Use P1 & R11 to set different self-oscillating frequencies. The PWM switching frequency in this type of self-oscillating switching scheme greatly impacts the audio performance, both in absolute frequency and frequency relative to the other channels. In the absolute terms, at higher frequencies distortion due to switching-time becomes significant, while at lower frequencies, the bandwidth of the amplifier suffers. In relative terms, interference between channels is most significant if the relative frequency difference is within the audible range. Normally, when adjusting the self-oscillating frequency of the different channels, it is suggested to either match the frequencies accurately, or have them separated by at least 25kHz. Under the normal operating condition with no audio input signal, the switching-frequency is set around 400kHz in the IRAUDAMP7S.
Selectable Dead-time
The dead-time of the IRS2092 is set based on the voltage applied to the DT pin. Fig 26 lists the suggested component value for each programmable dead-time between 25 and 105 ns. All the IRAUDAMP7S models use DT2 (45ns) dead-time.
Dead-time Mode DT1 DT2 DT3 DT4
R1 <10k 5.6k 8.2k Open
R2 Open 4.7k 3.3k <10k
DT/SD Voltage Vcc 0.46 x Vcc 0.29 x Vcc COM
Recommended Resistor Values for Dead Time Selection
Dead- time
IRS2092(S)
25nS 45nS
>0.5mA
Vcc R1
75nS 105nS VDT
DT R2
0.23xVcc 0.36xVcc 0.57xVcc Vcc
COM
Fig 26 Dead-time Settings vs. VDT Voltage
Protection System Overview
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The IRS2092 integrates over current protection (OCP) inside the IC. The rest of the protections, such as over-voltage protection (OVP), under-voltage protection (UVP), speaker DC offset protection (DCP) and over temperature protection (OTP), are realized externally to the IRS2092 (Fig 27). In the event that any of these external fault conditions are detected, the external shutdown circuit will disable the output by pulling down CSD pins, turning on red LEDs, and turning off blue LEDs (Fig 28). If the fault condition persists, the protection circuit stays in shutdown until the fault is removed. Once the fault is cleared, the blue LEDs turn on and red LEDs turn off.
TH100 is thermally connected with Heat sink
DCP
Q102 2N3906
R108 CH1_OUT 100k R109 CH2_OUT 100k R110 100k CP100
OTP
R103 715R
TH100 2.2k
2N3906
R101 4.7k Q103 2N3906
R104 4.7k Q101
330uF, 10V -VSS1 1 S1 2 3 4 5 +B +B Z100 *68V R111 10k Z101 *39V
OVP
-VSS1
SD R102 10k Q100 2N3904
6 SW DPDT
R105 10k
R106 10k
R107 10k
JW3
R112 47K
C100 0.1uF
Q104 2N3904
R113 10k -VSS1 -VSS1
Fig 27 DCP, OTP, UVP and OVP Protection Circuits .
.
R17
CSH
R18 R19
D4
BAV19
+ 1.2V +VAA
FET2 PROT
VB HO
FET1
LP Filter CSD VS CSD VCC OCSET LO
BLUE
.
RED
UVP
+B
.
-VSS
CP3
OCREF 5.1V OCREF
R13
R12
LED1
-B
OCSET
COM
Fig 28 Simplified Functional Diagram of OCP and Associated LED Indicators
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Over-Current Protection (OCP) Low-Side Current Sensing
The low-side current sensing feature protects the low side MOSFET from an overload condition in negative load current by measuring drain-to-source voltage across RDS(ON) during its on state. OCP shuts down the switching operation if the drain-to-source voltage exceeds a preset trip level. The voltage setting on the OCSET pin programs the threshold for low-side over-current sensing. When the VS voltage during low-side conduction gets higher than the OCSET voltage, the IRS2092 turns off outputs and pulls CSD down to -VSS.
High-Side Current Sensing
The high-side current sensing protects the high side MOSFET from an overload condition in positive load current by measuring drain-to-source voltage across RDS(ON) during its on state. OCP shuts down the switching operation if the drain-to-source voltage exceeds a preset trip level. High-side over-current sensing monitors drain-to-source voltage of the high-side MOSFET while it is in the on state through the CSH and VS pins. The CSH pin detects the drain voltage with reference to the VS pin, which is the source of the high-side MOSFET. In contrast to the low-side current sensing, the threshold of CSH pin to trigger OC protection is internally fixed at 1.2V. An external resistive divider R19, R18 and R17 are used to program a threshold as shown in Fig 26. An external reverse blocking diode D4 is required to block high voltage feeding into the CSH pin during low-side conduction. By subtracting a forward voltage drop of 0.6V at D4, the minimum threshold which can be set for the high-side is 0.6V across the drain-to-source.
Table 2 Actual OCP table setting thresholds
Device R12A R12B Tested OCP current 25oC CSH R18A R18B Tested OCP current 25oC Peak load current at rated power Function OCSET Amp7-55 1.3K Amp7-100 3.9K 23A 0.0 4.7K 23A 6.0A 8.7A Amp7-150 7.5K 30A 9.1K 29A 12.2A Amp7-200 5.1K 23A 8.2K 23A 8.9A
Over-Voltage Protection (OVP)
OVP is provided externally to the IRS2092. OVP shuts down the amplifier if the bus voltage between GND and +B exceeds 75V. The threshold is determined by a Zener diode Z100. OVP
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IRAUDAMP7S REV 1.3
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protects the board from harmful excessive supply voltages, such as due to bus pumping at very low frequency continuous output in stereo mode.
Under-Voltage Protection (UVP)
UVP is provided externally to the IRS2092. UVP prevents unwanted audible noise output from unstable PWM operation during power up and down. UVP shuts down the amplifier if the bus voltage between GND and +B falls below a voltage set by Zener diode Z101.
Speaker DC-Voltage Protection (DCP)
DCP protects speakers against DC output current feeding to its voice coil. DC offset detection detects abnormal DC offset and shuts down PWM. If this abnormal condition is caused by a MOSFET failure because one of the high-side or low-side MOSFETs short circuited and remained in the on state, the power supply needs to be cut off in order to protect the speakers. Output DC offset greater than ±4V triggers DCP.
Offset Null (DC Offset) Adjustment
The IRAUDAMP7S requires no output-offset adjustment. DC offsets are tested to be less than ±20 mV.
Over-Temperature Protection (OTP)
A NTC resistor, TH100 in Fig 25, is placed in close proximity to two dual MOSFETs on a heatsink to monitor heatsink temperature. If the heatsink temperature rises above 100 °C, the OTP shuts down both channels by pulling down CSD pins of the IRS2092. OTP recovers once the temperature has cooled down.
ON-OFF Switch
OFF position of S1 forces the IRAUDAMP7S to stay in shutdown mode by pulling down the CSD pin. During the shutdown mode the output MOSFETs are kept off.
Click and POP Noise Reduction
Thanks to the click and pop elimination function built into the IRS2092, IRAUDAMP7S does not use any additional components for this function.
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Power Supply Requirements
For convenience, the IRAUDAMP7S has all the necessary housekeeping power supplies onboard and only requires a pair of symmetric power supplies. Power supply voltage depends on the model and is shown in the power selection in Table 1.
House Keeping Power Supply
The internally-generated housekeeping power supplies include ±5.6V for analog signal processing, and +12V supply (VCC) referred to negative supply rail -B for MOSFET gate drive. The VAA and VSS supplying floating input section are fed from +B and -B power stage bus supplies via R117 and R118, respectively. Gate driver section of IRS2092 uses VCC to drive gates of MOSFETs. The VCC is referenced to B (negative power supply). D3 and CP6 form a bootstrap floating supply for the HO gate driver.
Bus Pumping
When the IRAUDAMP7S is running in the stereo mode, bus pumping effect takes place with low frequency high output. Since the energy flowing in the Class D switching stage is bi-directional, there is a period where the Class D amplifier feeds energy back to the power supply. The majority of the energy flowing back to the supply is from the energy stored in the inductor in the output LPF. Usually, the power supply has no way to absorb the energy coming back from the load. Consequently the bus voltage is pumped up, creating bus voltage fluctuations. Following conditions make bus pumping worse: 1. Lower output frequencies (bus-pumping duration is longer per half cycle) 2. Higher power output voltage and/or lower load impedance (more energy transfers between supplies) 3. Smaller bus capacitance (the same energy will cause a larger voltage increase) The OVP protects IRAUDAMP7S from failure in case of excessive bus pumping. One of the easiest counter measures of bus pumping is to drive both of the channels in a stereo configuration out-of-phase so that one channel consumes the energy flow from the other and does not return it to the power supply. Bus voltage detection monitors only +B supply, assuming the bus pumping on the supplies is symmetric in +B and -B supplies. There is no bus pumping effect in full bridge mode.
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Cyan: Positive Rail voltage (+B), Green: Speaker Output, Pink: Negative Rail voltage (-B) Fig 29 Bus Pumping in Half Bridge Mode
Bridged Configuration
By selecting S300 to Bridged position, the IRAUDAMP7S realizes full bridge mode, also known as bridge-tied-load, or BTL configuration. Full bridge operation is achieved by feeding out-of-phase audio input signals to the two input channels as shown in the Fig 30 below. In bridged mode, IRAUDAMP7S receives audio input signal from channel A only. The on-board inverter feed out-of-phase signal to Channel B. The speaker output must be connected between (+) of Channel A and (+) of Channel B in bridged mode. In bridged mode, nominal load impedance is 8 . (See power table in Table 1)
.
C300 R301 22k R302 +VAA 7 0.1uF 1 2 6 3 5 4 C301 5 6 SW DPDT 100 8 U300 TL072CP
Bridged
CP1B+ S300 1 2 3 4
From Ch B
RCA2
From Ch A
RCA1 JW8
R300 22k
Steereo
R303 -VSS 100
0.1uF
Fig 30 Bridged Configuration (BTL)
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Load Impedance
Each channel is optimized for a 4 speaker load in half bridge and 8 load in full bridge.
Output Filter Selection
Since the output filter is not included in the control loop of the IRAUDAMP7S, the control loop has no ability to compensate performance deterioration caused by the output filter. Therefore, it is necessary to understand what characteristics are preferable when designing the output filter. 1) The DC resistance of the inductor should be minimized to 20 m or less. 2) The linearity of the output inductor and capacitor should be high with output current and voltage. Fig 31 demonstrates THD performance difference with various inductors.
T
100 T 10
1
%
0.1
0.01
0.001
0.0001 100m 200m 500m 1 2 5 W 10 20 50 100 200
Fig 31 THD+N vs. Output Power with Different kind of Output Inductors
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Input Signal and Gain Setting
A proper input signal is an analog signal ranging from 20Hz to 20kHz with up to 3 VRMS amplitude with a source impedance of no more than 600 . Input signal with frequencies from 30kHz to 60kHz may cause LC resonance in the output LPF, causing a large reactive current flowing through the switching stage, especially with greater than 8 load impedances, and the LC resonance can activate OCP. The IRAUDAMP7S has an RC network called Zobel network (R30 and C13) to damp the resonance and prevent peaking frequency response with light loading impedance. (Fig 32) The Zobel network is not thermally rated to handle continuous supersonic frequencies above 20kHz. These supersonic input frequencies can be filtered out by adding R2 and C2 as shown on main schematic Fig 33 and Fig 34. This RC filter works also as an input RF filter to prevent potential radio frequency interferences.
. LP Filter . 0V
L1 C12
0V .
C13
R30
.
Fig 32 Output Low Pass Filter and Zobel Network
Gain Setting
The ratio of resistors R8/R2 in Fig 33 sets voltage gain. The IRAUDAMP7S has no on board volume control. To change the voltage gain, change the input resistor term R2. Changing R8 affects PWM control loop design and may result poor audio performance.
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VS1
Feedback
Note: R2 & C2 are RF filters, optional RCA1 RCA1 CP1 22uF R2 330 C2 1nF CP4 Z103 5.6V R14 4.7k RED PROT CSD1 3 FET2 BS250F R3 SD D1 100R -VSS Z104 5.6V CP3 10uF 6 R118 *3.3k 1W CP2 22uF R13 10k 8 R12 *7.5k OCSET IRS2092S DT 9 R26 10k R27 10k CP5 22uF 7 VSS VREF LO COM 11 10 2 C4 C6 1 1nF 1nF 22uF 2K POT P1 +VAA 1 R11 100R 3 C7 1nF 4 5 INCOMP CSD HO VS VCC 14 13 12 D3 2 VAA GND CSH VB 16 15 R7 *3.01K 1% U1 R22 R8 *120k 1% R117 *3.3k 1w R17
+B
R1
100k
C9
*9.1k R19 10k CP6 22uF
D4 FET1 *IRFI4019H-117P 5 HS1
150pF,250V
CH1
10k
*47k R18
+B C11 0.1uF,100V C10 CP8 *470uF,100V
0.1uF,400V
R24 20R
4 3 R28
R29
+B L1 22uH CH_OUT *MUR120RLG D5 C12 0.47uF, 400V *470uF,100V 0.1uF,100V CP7 R30 10, 1W D6 R31 2.2k
10R
CH1 OUT
SPKR1 1 2
R20 4.7R R25 20R LED1 Blue 2 R114 *1k 1W R115 1 *15k 1 2
10R
+ CH1 -
150pF,250V
-B *MUR120RLG C13 0.1uF, 400V
R21 10R VCC 3 TIP31C Q105 Z102
R23 10k
Note: Com ponents values m arked on red or * are according to power table IRAUDAMP7-55, +B,-B are +/-25V with FET1 as IRFI4024H-117P IRAUDAMP7-100, +B,-B are +/-35Vwith FET1 as IRFI4212H-117P IRAUDAMP7-150, +B,-B are +/-50Vwith FET1 as IRFI4019H-117P IRAUDAMP7-200, +B,-B are +/-70Vwith FET1 as IRFI4020H-117P
-B CP101
15V 22uF
IRAUDAMP7S Rev 1.0
Fig 33 Amplifier Schematic, Channel 1 & Channel 2
.
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IRAUDAMP7S REV 1.3
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C14 -B
C8
JW2 SD JW3 JW4 JW5 VCC -B VCC +B -B JW7 JW8 JW9 JW10 JW11 VCC -B VCC +B -B SD
TH1 is thermally connected with FET1
DCP
Q102 MMBT5401
R108 CH2_OUT 100k R109 100k R110 100k CP100
OTP
R103 715R
TH100 TH2.2k
JW12
CH1_OUT
MMBT5401
R101 4.7k -VSS 1 Q103 MMBT5401
R104 4.7k
Q101 S1 2 3 4 5 6 SW DPDT +B Z100 *68V
330uF,10V +B R111 10k Z101 *39V
-VSS
OVP
SD Q100 MMBT5551
C100 0.1uF
Q104 MMBT5551
UVP
R102 10k
R105 10k
R106 10k
R107 10k
R112 47k
R113 10k -VSS -VSS
Note: Com ponents values m arked on red or * are according to power table
Fig 34 Protection Schematic
.
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Bridged
S300 CP1B+ 1 3 4 5 C300 R301 22k JW1 R302 100 8 6 3 5 C301 4 U300 TLC081IDR 7 6 SW DPDT JW6 2
FromCh B
RCA2
Steereo
+VAA
FromCh A
RCA1
0.1uF 1 2
R300 22k
R303 -VSS 100
0.1uF
Fig 35 Bridge Preamp Schematic
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IRAUDAMP7S-150 Fabrication Materials
Table 3 IRAUDAMP7S-150 Electrical Bill of Materials
Quantity 8 4 4 4 2 3 1 12 Value 1nF,250V 150pF,250V 0.1uF,400V 0.1uF,100V 0.47uF, 400V 0.1uF, 10V ED365/3 22uF Description CAP CER 1000PF 250V C0G 5% CAP CER 150PF 250V U2J CAP .10UF 400V METAL POLYPRO CAP .10UF 100V CERAMIC X7R CAP .47UF 400V METAL POLYPRO CAP CER 0.1UF 10V SL 5% TERMINAL BLOCK 7.50MM 3POS PCB CAP 22UF 25V ELECT VR RADIAL Designator C2A, C2B, C4A, C4B, C6A, C6B, C7A, C7B C8A, C8B, C9A, C9B C10A, C10B, C13B C11A, C11B, C14B C12A, C12B C13A, C14A, Digikey P/N 445-2325-1-ND 490-5025-1-ND 495-1311-ND PCC2239CT-ND 495-1315-ND 445-2686-1-ND ED2355-ND 493-1058-ND Vendor TDK Corporation Murata Electronics EPCOS Inc Panasonic - ECG EPCOS Inc TDK Corporation On Shore Technology Inc Nichicon
C100, C300, C301 CONN1 CP1A, CP1B, CP2A, CP2B, CP4A, CP4B, CP5A, CP5B, CP6A, CP6B, CP101A, CP101B CP3A, CP3B CP7A, CP8B CP100 CP7B, CP8A,
2 4 1 2 2 2 2 4 2 2 1 1 3 1 1 2 2 2
10uF, 16V 470uF,100V 330uF, 10V Red LED 1N4148WS MURA120T3G BAV19WS MURA120T3G IRFI4019H117P BS250P Heat Sink JW-300 JW-300 JW-1500 JW-1500 JW-1800 JW-2000 22uH, 13A
CAP ELECT 10UF 16V KS RADIAL CAP 470UF 100V ELECT PW RADIAL CAP 330UF 10V ALUM LYTIC RADIAL LED 3MM HI-EFF RED TRANSPARENT DIODE SWITCH 75V 200MW DIODE ULTRA FAST 1A 200V DIODE SWITCH 100V 200MW DIODE ULTRA FAST 1A 200V IRFI4019H-117P, Dual MOSFET TO-220-5 MOSFET P-CH 45V 90MA Aluminum heat spreader Wire Jumper insulated Wire Jumper insulated Wire Jumper insulated Wire Jumper insulated Wire Jumper insulated Wire Jumper insulated Class D Inductor, #20 #20 #20 #20 #20 #20 22UH AWG AWG AWG AWG AWG AWG
P966-ND 493-1985-ND P5125-ND 160-1140-ND 1N4148WS-FDICT-ND MURA120T3GOSCTND BAV19WS-FDICT-ND MURA120T3GOSCTND IR's Part No. BS250FTC-ND Drawing IRHS_Amp1 Custom Custom Custom Custom Custom Custom Sagami 7G17A-220MR or IN09063 160-1600-ND 3362H-202LF-ND MMBT5551FSCT-ND
Panasonic - ECG Nichicon Panasonic - ECG Lite-On Inc Diodes Inc ON Semiconductor Diodes Inc ON Semiconductor International Rectifier Zetex Inc Custom made Custom Custom Custom Custom Custom Custom Inductors, Inc. or ICE Components, Inc. LITE-ON INC Bourns Inc. Fairchild Semiconductor
CSD1A, CSD1B D1A, D1B D3A, D3B D4A, D4B D5A, D5B, D6A, D6B FET1A, FET1B FET2A, FET2B HS1A JW1 JW2, JW4, JW10 JW3 JW5 JW6, JW7 JW8, JW9 L1A, L1B
2 2 2
Blue LED 2K POT MMBT5551
LED 3MM DUAL BLUE CLEAR POTENTIOMETER
FLANGE
LED1A, LED1B P1A, P1B Q100, Q104
TRANSISTOR NPN 160V
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3 2 3 1 1 2 2 2 2 2 18
MMBT5401 TIP31C 100k 330 330 100R 3.01K 120k 1% 100R 7.5k 10k
TRANS PNP 150V 350MW SMD TRANSISTOR NPN 100V 3A RES 100K OHM 1/8W 5% RES 330 OHM 1/8W 1% RES 330 OHM CARBON FILM RES 100 OHM 1/8W 5% RES 3.01K OHM 1/8W 1% RES METAL FILM 120K OHM 1/4W RES 100 OHM 1/8W 5% RES 7.5K OHM 1/8W 5% RES 10K OHM 1/8W 5%
Q101, Q102, Q103 Q105A, Q105B R1A, R1B, R110 R2A R2B R3A, R3B R7A, R7B R8A, R8B R11A, R11B R12A, R12B R13A, R13B, R19A, R19B, R22A, R22B, R23A, R23B, R26A, R26B, R27A, R27B, R102, R105, R106, R107, R111, R113 R14A, R14B, R101, R104 R17A, R17B R18A, R18B R20A, R20B R21A, R21B R24A, R24B, R25B R28A, R28B, R29B R30A, R30B R31A, R31B R103 R108 R109 R112 R114A, R114B R115A, R115B R117A, R117B, R118A, R118B R300, R301 R302, R303 RCA1A RCA1B S1, S300 SPKR1A, SPKR1B TH100 U1A, U1B U300 Z102A, Z102B R25A, R29A,
MMBT5401-FDICT-ND 497-2615-5-ND RHM100KARCT-ND RHM330CRCT-ND P330BACT-ND P100ACT-ND RHM3.01KCCT-ND P120KCACT-ND RHM100ARCT-ND RHM7.5KARCT-ND RHM10KARCT-ND
Diodes Inc STMicroelectronics Rohm Rohm Panasonic - ECG Panasonic - ECG Rohm Panasonic - ECG Rohm Rohm Rohm
4 2 2 2 2 4 4 2 2 1 1 1 1 2 2 4 2 2 2 2 2 2 1 2 1 2
4.7k 47k 9.1k 4.7R 10R 20R 10R 10, 1W 2.2k 715R 100k 100k 47k 1k 1W 15k 3.3k 1w 22k 100 RCJ-012 RCJ-013 EG2209A ED365/2 2.2k at 25C IRS2092SPBF TLC071CD 15V
RES 4.7K OHM 1/8W 5% RES 47K OHM 1/8W 5% RES 9.1K OHM 1/8W 5% RES 4.7 OHM 1/4W 1% RES 10.0 OHM 1/4W 1% RES 20.0 OHM 1/8W 1% RES 10.0 OHM 1/8W 1% RES 10 OHM 1W 5% RES 2.2K OHM 1/4W 5% RES 715 OHM 1/8W 1% RES 100K OHM 1/8W 5% RES 100K OHM CARBON FILM 1/4W 5% RES 47K OHM 1/8W 5% RES 1.0K OHM 1W 5% METAL OXIDE RES 15K OHM CARBON FILM 1/4W 5% RES 3.3K OHM 1W 5% METAL OXIDE RES 22K OHM 1/8W 5% RES 100 OHM 1/8W 5% CONN RCA JACK METAL R/A RED PCB CONN RCA JACK METAL R/A WHT PCB SWITCH SLIDE DPDT 12V .1A L=4 TERMINAL BLOCK 7.50MM 2POS PCB THERMISTOR NTC 2.2K OHM LEADED Class D Controller, IRS2092SPbF 16-Lead SOIC IC SINGLE SUPPLY OPAMP 8-SOIC DIODE ZENER 500MW 15V
RHM4.7KARCT-ND RHM47KARCT-ND RHM9.1KARCT-ND P4.7RCT-ND RHM10.0FRCT-ND RHM20.0CRCT-ND RHM10.0CRCT-ND PT10XCT-ND RHM2.2KERCT-ND RHM715CCT-ND RHM100KARCT-ND P100KBATB-ND RHM47KARCT-ND 1.0KW-1-ND P15KBACT-ND 3.3KW-1-ND RHM22KARCT-ND RHM100ARCT-ND CP-1401-ND (Red) CP-1402-ND (White) EG1908-ND ED2354-ND BC2304-ND IR's P/N 296-2414-5-ND IRS2092SPBF MMSZ4702T1GOSCTND
Rohm Rohm Rohm Panasonic - ECG Rohm Rohm Rohm Panasonic - ECG Rohm Rohm Rohm Panasonic - ECG Rohm Yageo Panasonic - ECG Yageo Rohm Rohm CUI Inc CUI Inc E-Switch On Shore Technology Vishay/BC Components International Rectifier Texas Instruments ON Semiconductor
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1 1 4
68V 39V 5.6V
DIODE ZENER 375MW 68V DIODE ZENER 500MW 39V
Z100 Z101
568-3782-1-ND
BZT52C39-TPMSCTND DIODE ZENER 500MW 5.6V Z103A, Z103B, Z104A, BZT52C5V6Z104B TPMSCT-ND Note all ½ W and 1W resistors are flame proof part numbers
NXP Semiconductors Micro Commercial Co Micro Commercial Co
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Table 4 IRAUDAMP7S Mechanical Bill of Materials
Quantit y 5 1 Value Washer #4 SS PCB Screw 440X5/16 Stand off 0.5" Stand off 0.5" AAVID 4880G Description WASHER LOCK INTERNAL #4 SS Print Circuit Board IRAUDAMP7S_Rev 2.2 .PCB SCREW MACHINE PHILLIPS 4-40X5/16 STANDOFF HEX 440THR .500"L ALUM STANDOFF HEX M/F 440 .500" ALUM, Chassis GND Thermalloy TO-220 mounting kit with screw Designator Lock washer 1, Lock washer 2, Lock washer 3, Lock washer 4, Lock washer 5 PCB 1 Screw 1, Screw 2, Screw 3, Screw 4, Screw 5, Screw 6, Screw 7, Screw 8, Screw 9, Screw 10, Screw 11, Screw 12 Stand Off 1, Stand Off 2, Stand Off 3, Stand Off 4 Stand Off 5 TO-220 mounting kit 1 H343ND 1893KND 8401KND Newuark 82K609 6 Digikey P/N H729ND Vendor Building Fastener s Custom Building Fastener s Keystone Electronics Keystone Electronics Thermalloy
12
4 1 1
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Table 5 IRAUDAMP7S Models Differential Table
Model Name Item IR Power MOSFE TS Half Bridge Output Full Bridge Output Power Supply Audio Gain Feedbac k +VAA -VSS AMP7S-55 FET1 8 4 8 IRFI4024H-117P 25 W x 2 50 W x 2 100 W x 1 ±25 V ±3 V 20 68k 1 k, 1 W 1 k, 1 W 100,1 W 4.7 k 1.3 k (20 A) 0.0 (20A) 20 k 24 V BZT52C24TPMSCT-ND 12 V MMSZ5242BT1GO SCT-ND MURA120T3OSCTND AMP7S-100 IRFI4212H-117P 60 W x 2 120 W x 2 240 W x 1 ±35 V ±5 V 30 100k 2.2 k, 1 W 2.2 k, 1 W 220, 1 W 10 k 3.9 k (23 A) 4.7 k (23A) 33 k 47 V MMSZ5261BT1GO SCT-ND 30 V MMSZ5256BT1GO SCT-ND MURA120T3OSCTND AMP7S-150 IRFI4019H-117P 125 W x 2 250 W x 2 500 W x 1 ±50 V ±8 V 36 120k 3.3 k, 1 W 3.3 k, 1 W 1 k, 1 W 15 k 7.5 k (30 A) 9.1 k (29A) 47 k 68 V 568-3782-1-ND 39 V BZT52C39TPMSCT-ND IMURA120T3OS CT-ND AMP7S-200 IRFI4020H-117P 250 W x 2 N/A N/A ±70 V ±10 V 40 130 k 5.1 k, 1 W 5.1 k, 1 W 2.2 k 1 W 20 k 5.1 k (23 A) 8.2 k (23 A) 75 k 91 V MMSZ5270BT1G OSCT-ND 51 V MMSZ5262BT1G OSCT-ND N/A Zener Digikey P/N Zener Digikey P/N (Trip level) (Trip level) Stereo Stereo Bridged Notes
+B, -B ±B Voltage Range Gain R8A,R8 B R117A* R117B* R118A* R118B* R114A* R114B* R115A R115B R12A R12B R18A R18B R17A R17B Z100 Z101 D5A D5B D6A D6B
VCC OCSET CSH VB OVP UVP Clampin g Diode
* Marked components are axial, ±5 %, ¼ w, and flame proof type.
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IRAUDAMP7S Hardware
Heat sink Put silicone grease between the heat spreader and TO-220-5
Heatsink threaded
Screw Lock washer Flat Washer #4 Dual FET TO-220-5
Heatsink threaded PCB Lock washer Screws H343-ND Screw
Lock washers H729-ND
Fig 36 Dual MOSFET Mounting
Heat Sink
TO-220 Pad insulator Shoulder Washer
Heatsink threaded
Screw Lock washer Flat Washer #4
TO-220 Heatsink threaded PCB Lock washer Lock washers H729-ND Screws H343-ND
Screw
Fig 37 +VCC Regulator TO-220 Mounting
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Fig 38 Heat Spreader
.
Screw H343-ND Lock washer incert thermistor into this hole and put silicone grease Screw H343-ND Lock washer
Screw H343-ND Lock washer
Stand Off 3 1893K-ND
Screw H343-ND Lock washer Lock washer
Stand Off 2 1893K-ND
Lock washer Screw Stand Off 4 1893K-ND Lock washers H729-ND Screws H343-ND GND Standoff Screw Stand Off 5 8401K-ND
Stand Off 1 1893K-ND
Fig 39 Hardware Assemblies
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IRAUDAMP7S PCB Specifications
PCB: 1. 2. 3. 4. 5. 6. Single Layers SMT PCB with through holes 1/16 thickness 2/0 OZ Cu FR4 material 10 mil lines and spaces Solder Mask to be Green enamel EMP110 DBG (CARAPACE) or Enthone Endplate DSR-3241or equivalent. 7. Top Silk Screen to be white epoxy non conductive per IPCRB 276 Standard. 8. All exposed copper must finished with TIN-LEAD Sn 60 or 63 for 100u inches thick. 9. Tolerance of PCB size shall be 0.010 0.000 inches 10. Tolerance of all Holes is -.000 + 0.003" 11. PCB acceptance criteria as defined for class II PCB'S standards. Gerber Files Apertures Description: All Gerber files stored in the attached CD-ROM were generated from Protel Altium Designer Altium Designer 6. Each file name extension means the following: 1. .gbl 2. .gto 3. .gbo 4. .gbs 5. .gko 6. .gm1 7. .gd1 8. .gg1 9. .txt 10. .apr Bottom copper, bottom side Top silk screen Bottom silk screen Bottom Solder Mask Keep Out, Mechanical Drill Drawing Drill locations CNC data Apertures data
Additional files for assembly that may not be related with Gerber files: 11. .pcb 12. .bom 13. .cpl 14. .sch 15. .csv 16. .net 17. .bak 18. .lib PCB file Bill of materials Components locations Schematic Pick and Place Components Net List Back up files PCB libraries
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Fig 40 IRAUDAMP7S PCB Top Overlay (Top View)
Fig 41 IRAUDAMP7S PCB Bottom Layer (Top View)
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Revision changes descriptions
Revision Rev 1.1 Rev 1.2 Rev 1.3 Changes description Released ROHS Compliant(BOM updated) BOM updated :Ice Components as a second vender of the inductor Date Sep, 03 2008 May, 29 2009 October 28, 2009
WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245 Tel: (310) 252-7105 Data and specifications subject to change without notice. 08/29/2008
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IRAUDAMP7S REV 1.3
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