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TDA7250
60 W HI-FI DUAL AUDIO DRIVER

. . . . . . .

WIDE SUPPLY VOLTAGE RANGE : 20 TO 90 V (± 10 to ± 45 V) VERY LOW DISTORTION AUTOMATIC QUIESCENT CURRENT CONTROL FOR THE POWER TRANSISTORS WITHOUT TEMPERATURE SENSE ELEMENTS OVERLOAD CURRENT PROTECTION FOR THE POWER TRANSISTORS MUTE/STAND-BY FUNCTIONS LOW POWER CONSUMPTION OUTPUT POWER 60 W/8 AND 100 W/4

DIP20 ORDERING NUMBER : TDA7250

DESCRIPTION The TDA7250 stereo audio driver is designed to drive two pair of complementary output transistor in the Hi-Fi power amplifiers. APPLICATION CIRCUIT

March 1995

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TDA7250
PIN CONNECTION (top view)

ABSOLUTE MAXIMUM RATINGS
Symbol Vs Ptot Tj, Tstg Supply Voltage Power Dissipation at Tamb = 60 °C Storage and Junction Temperature Parameter Value 100 1.4 ­ 40 to + 150 Unit V W °C

THERMAL DATA
Symbol Rth j-amb Parameter Thermal Resistance Junction-ambient Max. Value 65 Unit °C/W

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TDA7250
PIN FUNCTIONS
N° 1 2 3 4 5 Name VS ­ POWER SUPPLY NON­INV. INP. CH. 1 QUIESC. CURRENT CONTR. CAP. CH1 SENSE (­) CH. 1 ST. BY / MUTE / PLAY Negative Supply Voltage. Channel 1 Input Signal. This capacitor works as an integrator, to control the quiescent current to output devices in no-signal conditions on channel 1. Negative voltage sense input for overload protection and for automatic quiescent current control. Three-functions Terminal. For VIN = 1 to 3 V, the device is in MUTE and only quiescent current flows in the power stages ; - for VIN < 1 V, the device is in STAND-BY mode and no quiescent current is present in the power stages ; - for VIN > 3 V, the devic High Impedance Power-stages Monitor. Negative Voltage Sense Input for Overload Protection and for Automatic Quiescent Current Control. This capacitor works as an integrator, to control the quiescent current to output devices in no-signal conditions on channel 2. If the voltage at its terminals drops under 250 mV, it also resets the device from high-impedance state of output stages. Channel 2 Input Signals. Negative Supply Voltage. Feedback from Output (channel 2). Out Signal to Lower Driver Transistor of Channel 2. Out Signal to Higher Driver Transistor of Channel 2. Positive Voltage Sense Input for Overload Protection and for Automatic Quiescent Current Control. AC Input Ground in MUTE Condition. Positive Supply Voltage. Positive Voltage Sense Input for Overload Protection and for Automatic Quiescent Current Control. Out Signal to High Driver Transistor of Channel 1. Out Signal to Low Driver Transistor of Channel 1. Feedback from Output (channel 1). Function

6 7 8

CURRENT PROGRAM SENSE (­) CH. 2 QUIESC. CURRENT CONTR. CAP. CH. 2

9 10 11 12 13 14 15 16 17 18 19 20

NON­INV. INP. CH. 2 Vs ­ POWER SUPPLY INVERT. INP. CH. 2 OUT (­) CH. 2 OUT (+) CH. 2 SENSE (+) CH. 2 COMMON AC GROUND VS + POWER SUPPLY SENSE (+) CH. 1 OUT (+) CH. 1 OUT (­) CH. 1 INVERT. INP. CH. 1

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TDA7250
BLOCK DIAGRAM

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TDA7250
ELECTRICAL CHARACTERISTICS (Tamb = 25 °C, Vs = ± 35 V, play mode, unless otherwise specified)
Symbol Parameter Vs Supply Voltage Quiescent Drain Current Id Ib Vos Ios Gv eN SR d Input Bias Current Input Offset Voltage Input Offset Current Open Loop Voltage Gain Input Noise Voltage Slew Rate Total Harmonic Distortion Test Conditions Stand-by Mode Play Mode Min. ± 10 Typ. 8 10 0.2 1 100 90 60 3 10 Gv = 26 dB, Po = 40 W f = 1 kHz f = 20 kHz Vs = ± 35 V, R L = 8 Vs = ± 30 V, R L = 8 Vs = ± 35 V, R L = 4 f = 100 Hz f = 1 kHz 0.004 0.03 60 60 40 100 ±5 75 75 Max. ± 45 14 1 ± 10 200 Unit V mA µA mV nA dB µV V/µs % % Vpp W W W mA dB dB

f = 100 Hz f = 10 kHz RG = 600 B = 20 Hz to 20 kHz

Vopp Po

Output Voltage Swing Output Power (*)

Io SVR Cs

Output Current Supply Voltage Rejection Channel Separation

MUTE / STANDBY/ PLAY FUNCTIONS
Symbol Ii Vth H Vth H Vi Parameter Input Current (pin 5) Comparator Standby Threshold (**) Comparator Mute / Play Threshold (**) Hysteresis Mute / Play Mute Attenuation Input Voltage Max. (pin 5)
f = 1 KHz ; d = 0.1 % ;

Test Conditions / Mute

Min. 1.0

Typ. 0.1 1.25 200

Max. 1.5

Unit µA V mV

Hysteresis Standby / Mute 2.4

3.0 300

3.6

V mV dB V

f = 1 kHz 12 (**)
G v =26 dB.

60

(*) Appli cation circuit of fig. 1 (**) Referred to - Vs .

CURRENT SURVEY CIRCUITRY
Symbol Parameter Comparator Reference td Delay Time to + VS to ­ VS Test Conditions Min. 0.8 0.8 10 Typ. 1 1 Max. 1.4 1.4 Unit V V µs

QUIESCENT CURRENT CONTROL
Symbol Parameter Capacitor Current Comparator Reference Test Conditions Charge Discharge to + VS to ­ VS Min. 30 250 10 Typ. 60 500 20 10 25 Max. Unit µA µA mV mV 5/11

TDA7250
Figure 1 : Application Circuit with Power Darlingtons.

Note : Q1/Q2 = Q3/Q4 = TIP 142/TIP147 GV = 1 + R1/R2

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TDA7250
Figure 2 : Output Power vs. Supply Voltage. Figure 3 : Distortion vs.Output Power (*).

Figure 4 : Channel Separation.

Figure 5 : Supply Voltage Rejection vs. Frequency.

Figure 6 : Quiescent Current vs. Supply Voltage.

Figure 7 : Quiescent Current vs. Tamb.

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TDA7250
Figure 8 : Total Dissipated Power vs. Output Powe r (*). Figure 9 : Efficiency vs. Output Power (*).

Figure 10 : Play-mute Standby Operation.

(*) Complete circuit

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TDA7250
Figure 11 : Application Circuit Using Power Transistors.

Figure 12 : Suggested Transistor Types for Various Loads and Powers. RL = 8
15W BDX 53/54A +30W BDX 53/54B +50W BDW 93/94B +70W TIP 142/147

TL = 4
30W BDW 93/94A +50W BDW 93/94B +90W BDV 64/65B +130W MJ 11013/11014

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TDA7250
DIP20 PACKAGE MECHANICAL DATA
DIM. MIN. a1 B b b1 D E e e3 F I L Z 3.30 1.27 8.80 2.54 22.86 7.10 5.10 0.130 0.050 0.38 0.51 0.85 0.50 0.50 24.80 0.346 0.100 0.900 0.280 0.201 0.015 1.40 mm TYP. MAX. MIN. 0.020 0.033 0.020 0.020 0.976 0.055 inch TYP. MAX.

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TDA7250

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. © 1995 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A.

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