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Ordering number: 2134B


Thick Film Hybrid IC

STK4040V

AF Power Amplifier (Split Power Supply)
(70W min, THD = 0.08%)



Features Package Dimensions
Small-sized package permitting audio sets to be made unit: mm
slimmer (up to 70W) 4062
The STK4024Vseries are available for output 20W to
[STK4040V]
100W (200W) and are pin-compatible.
(120W to 200W : 18 pins)
Facilitates thermal design of slim stereo sets.
Distortion 0.08% due to current mirror circuit
Possible to design electronic supplementary circuits
(pop noise muting at the time of power ON/OFF, load
short protector, thermal shutdown)




Specifications
Maximum Ratings at Ta = 25C

Parameter Symbol Conditions Ratings Unit
Maximum supply voltage VCC max 62 V
Thermal resistance j-c 1.4 C/W
Junction Temperature Tj 150 C
Operating substrate temperature Tc 125 C
Storage temperature Tstg -30 to +125 C
Available time for load short-circuit ts*1 VCC = 42V, RL = 8, f = 50Hz, Po = 70W 1 s


Recommended Operating Conditions at Ta = 25C

Parameter Symbol Conditions Ratings Unit
Recommended supply voltage VCC 42 V
Load resistance RL 8




SANYO Electric Co., Ltd. Semiconductor Business Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
70397HA (ID) / D218MO / 9208MO, TS No. 2134--1/9
STK4040V



Operating Characteristics at Ta = 25C, VCC = 42V, RL = 8, VG = 40dB, Rg = 600,
100kHz LPF ON, RL : noninductive load

Parameter Symbol Conditions min typ max Unit
Quiescent current Icco VCC = 50.5V 15 120 mA
THD = 0.08%,
Po (1) 70 W
f = 20Hz to 20kHz
Output power
VCC = 36V, THD = 0.2%,
Po (2) 70 W
RL = 4, f = 1kHz
Total harmonic distortion THD Po = 1.0W, f = 1kHz 0.08 %
+0
Frequency response fL, fH Po = 1.0W, dB 20 to 50k Hz
3
Input impedance ri Po = 1.0W, f = 1kHz 55 k
Output noise voltage VNO *2 VCC = 50.5V, Rg = 10k 1.2 mVrms
Neutral voltage VN VCC = 50.5V 70 0 +70 mV


Notes. For power supply at the time of test, use a constant-voltage power
supply unless otherwise specified.
*1 For measurement of the available time for load short-circuit and out-
put noise voltage, use the specified transformer power supply shown
right.
*2 The output noise voltage is represented by the peak value on rms
scale (VTVM) of average value indicating type. The noise voltage
waveform includes no flicker noise.
Specified Transformer Power Supply
(Equivalent to MG-200)



Equivalent Circuit




No. 2134--2/9
STK4040V


Sample Application Circuit: 70W min Single-Channel AF Power Amplifier




Sample Printed Circuit Pattern for Application Circuit (Cu-foiled side)




No. 2134--3/9
Voltage gain, VG - dB Total harmonic distortion, THD - % Output power, Po - W




Frequency, f - Hz
Output power, Po - W
Input voltage, Vi - mV

Quiescent current, Icco - mA Output power, Po - W Total harmonic distortion, THD - %
STK4040V




Frequency, f - Hz
Output power, Po - W




Operating substrate temperature, Tc - C
Neutral voltage, VN - mV




No. 2134--4/9
Voltage gain, VG - dB IC power dissipation, Pd - W Quiescent current, Icco - mA




Frequency, f - Hz
Output power, Po - W
Supply voltage, VCC - V
Neutral voltage, VN - mV

Current drain, ICC - A IC power dissipation, Pd - W Output power, Po - W
STK4040V




Frequency, f - Hz
Output power, Po - W
Supply voltage, VCC - V




No. 2134--5/9
STK4040V




Output noise voltage, VNO - mVrms
Current drain, ICC - A




Output power, Po - W Signal source resistance, Rg -


Description of External Parts




No. 2134--6/9
STK4040V




Input filter circuit
R1, C1
Used to reduce noise at high frequencies.
Input coupling capacitor
C2 Used to block DC current. When the reactance of the capacitor increases at low frequencies, the dependence of 1/f noise on signal source
resistance causes the output noise to worsen. It is better to decrease the reactance.
Input bias resistor
Used to bias the input pin to zero.
R2
Affects VN stability. (See NF circuit.)
Because of differential input, this resistor fixes the input resistance practically.
NFB circuit (AC NF circuit). It is desirable that the error of the resistor value is 1% or less.




C3 : Capacitor for AC NF
R4, R5 : Used to set VG
R4, R5
C3 (R2) VG setting obtained by using R4, R5
R5
log 20 -----
- 40dB is recommended.
R4
Low cutoff frequency setting obtained by using, R4, C3.
f L = ---------------------------- Hz
2 R4 C3

To change VG setting, it is desirable to change R4. In this case, the low cutoff frequency setting needs to be rechecked. When VG setting is
changed by changing R5, R5 must be made equal to R2 to ensure VN balance. If the resistor value is increased more than the existing
value, it may be hard to ensure VN balance and the temperature characteristic of VN may be also deteriorated.
R3 Differential constant-current bias resistor
R6, R7 Used for oscillation blocking and phase compensation
Used for oscillation blocking and phase compensation
R7, C4
(C4 : A polyester film capacitor is recommended.)
Used for oscillation blocking and phase compensation
C6, C9 Power amp stage (Must be connected near the pin) C6 : Power amp on (+) side
C9 : Power amp on () side
Used for oscillation blocking and phase compensation
C8
(Used for oscillation blocking before clip at power amp stage)
C5 Used for oscillation blocking and distortion improvement
R8, C10 Ripple filter circuit on (+) side
R9, C13 Ripple filter circuit on () side
Used for oscillation blocking
C11, C12 Used to decrease the power supply impedance to operate the IC stably. Must be connected near the IC pin. It is desirable to use an
electrolytic capacitor.




No. 2134--7/9
STK4040V


Sample Application Circuit (protection circuit and muting circuit)




Thermal Design
The IC power dissipation of the STK4040V at the IC-operated mode is 47.4W max. at load resistance 8 and 70.5W
max. at load resistance 4 for continuous sine wave as shown in Figure 1 and 2.
IC Power dissipation, Pd - W




IC Power dissipation, Pd - W




Output power, Po - W Output power, Po - W

Figure 1. STK4040V Pd Po (RL = 8) Figure 2. STK4040V Pd Po (RL = 4)




No. 2134--8/9
STK4040V


In an actual application where a music signal is used, it is impractical to estimate the power dissipation based on the con-
tinuous signal as shown above, because too large a heat sink must be used. It is reasonable to estimate the power dissipa-
tion as 1/10 Po max. (EIAJ).
That is, Pd = 30.6W at 8, Pd = 38.2W at 4
Thermal resistance c-a of a heat sink for this IC power dissipation (Pd) is fixed under conditions 1 and 2 shown below.
Condition 1: TC = Pd c-a + Ta 125C .............................................. (1)
where Ta : Specified ambient temperature
TC : Operating substrate temperature
Condition 2: Tj= Pd (c-a) + Pd/2 (j-c) + Ta 150C..................... (2)
where Tj : Junction temperature of power transistor
Assuming that the power dissipation is shared equally between the two power transistors, thermal resistance j-c is
1.4C/W and
Pd (c-a + 1.4/2) + Ta 150C........................................ (3)
Thermal resistance c-a of a heat sink must satisfy ine-
qualities (1) and (3).
Figure 3 shows the relation between Pd and c-a given Thermal resistance of heat sink, c-a - C/W
from (1) and (3) with Ta as a parameter.


[Example] The thermal resistance of a heat sink is
obtained when the ambient temperature speci-
fied for a stereo amplifier is 50C.
Assuming VCC = 42V, RL = 8,
VCC = 36V, RL = 4,
RL = 8 : Pd1 = 30.6W at 1/10 Po max.
RL = 4 : Pd2 = 38.2W at 1/10 Po max.
The thermal resistance of a heat sink is
obtained from Figure 3.
RL = 8 : c-a1 = 2.45C/W IC Power dissipation, Pd - W
RL = 4 : c-a2 = 1.89C/W Figure 3. STK4040V c-a Pd
Tj when a heat sink is used is obtained from
(3).
RL = 8 : Tj = 146.4C
RL = 4 : Tj = 148.9C
This design is based on the use of a constant-voltage regulated power supply. Pd differs when a transformer power supply
is used. Redesign must be made based on Pd that suits the regulation of each transformer.




s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear
power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury,
death or property loss.
s Anyone purchasing any products described or contained herein for an above-mentioned use shall:
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their
officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated
with such use:
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO.,
LTD., its affiliates, subsidiaries and distributors or any of their officers and employees, jointly or severally.
s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO
believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of
intellectual property rights or other rights of third parties.

This catalog provides information as of July, 1997. Specifications and information herein are subject to change without notice.
No. 2134--9/9