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Ordering number : ENN7342

Thick-Film Hybrid IC

STK404-050
One-Channel Class AB Audio Power Amplifier IC
30 W

Overview Package Dimensions

The STK404-000 series products are audio power unit: mm
amplifier hybrid ICs that consist of optimally-designed 4198-SIP10
discrete component power amplifier circuits that have
been miniaturized using SANYO's unique insulated metal [STK404-050]
substrate technology (IMST). The adoption of a newly-
developed low thermal resistance substrate allows this
44.0
series of devices to be provided in miniature packages 8.5
36.5
significantly more compact than earlier Sanyo products
with similar specifications.

25.6
3.6

13.0
Features

20.0
• Series of pin compatible power amplifiers ranging from 1 10
2.54 0.5 0.4
45 W to 180 W (10%/1 kHz) devices. The same printed

4.0
(6.82) 2.9
circuit board can be used depending on the output power 9 × 2.54 = 22.86
grade.
• Miniature packages
SANYO: SIP10
— 30 W to 40 W (THD = 0.4%, f = 20 Hz to
20 kHz); 44.0 mm × 25.5 mm × 8.5 mm *
— 50 W to 80 W (THD = 0.4%, f = 20 Hz to
20 kHz); 46.6 mm × 25.5 mm × 8.5 mm *
— 100 W to 120 W (THD = 0.4%, f = 20 Hz to
20 kHz); 59.2 mm × 25.5 mm × 8.5 mm *
*: Not including the pins.
• Output load impedance: RL = 6 Ω
• Allowable load shorted time: 0.3 seconds
• Supports the use of standby, muting, and load shorting
protection circuits.

Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
21504TN (OT) No. 7342-1/5
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STK404-050

Series Organization
These products are organized as a series based on their output capacity.
Type No.
Item
STK404-050 STK404-070 STK404-090 STK404-100 STK404-120 STK404-130 STK404-140
Output 1 (0.4%/20 Hz to 20 kHz) 30 W 40 W 50 W 60 W 80 W 100 W 120 W
Output 2 (10%/1 kHz) 45 W 60 W 80 W 90 W 120 W 150 W 180 W
Maximum supply voltage (6 Ω) ±37 V ±43 V ±46 V ±51 V ±59 V ±64 V ±73 V
Recommended supply voltage (6 Ω) ±26 V ±30 V ±32 V ±35 V ±41 V ±45 V ±51 V
Remarks — Built-in thermal protection circuit
Package 44.0 mm × 25.5 mm × 8.5 mm 46.6 mm × 25.5 mm × 8.5 mm 59.2 mm × 25.5 mm × 8.5 mm

Specifications
Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage (No signal) VCC max(0) ±40 V
Maximum supply voltage VCC max(1) RL = 6 Ω ±37 V
Thermal resistance θ j -c Per power transistor 3.0 °C/W
Junction temperature Tj max 150 °C
Both the Tj max and the Tc max conditions must be met.
Operating IC substrate temperature Tc max 125 °C
Storage temperature Tstg –30 to +125 °C
Allowable load shorted time *3 ts VCC = ±26.0 V, RL = 6 Ω, f = 50 Hz, PO = 30 W 0.3 s

Operating Characteristics at Tc = 25°C, RL = 6 Ω (noninductive load), Rg = 600 Ω, VG = 30 dB

Conditions*1 Ratings
Parameter Symbol Unit
VCC (V) f (Hz) PO (W) THD (%) min typ max
PO (1) ±26.0 20 to 20 k 0.4 30
Output power W
PO (2) ±26.0 1k 10 45
Frequency characteristics fL, fH ±26.0 1.0 +0 –3 dB 20 to 20 k Hz
Input impedance ri ±26.0 1k 1.0 55 kΩ
Output noise voltage *2 VNO ±32.0 Rg = 10 kΩ 1.2 mVrms
Quiescent current ICCO ±32.0 No loading 50 mA
Neutral voltage VN ±32.0 –100 0 +100 mV

Notes: 1. Unless otherwise noted, use a constant-voltage supply for the power supply used during inspection.
2. The output noise voltage values shown are peak values read with a VTVM. However, an AC stabilized (50 Hz) power supply should be used to
minimize the influence of AC primary side flicker noise on the reading.
3. Use the transformer power supply circuit shown in the figure below for allowable load shorted time measurement and output noise voltage
measurement.
This IC is designed assuming that applications will provide a load-shorting protection function that operates within 0.3 seconds of the load being
shorted and that either cuts off power to the IC or eliminates the load-shorted state in some other manner.

DBA40C 10000µF
+VCC
+
500Ω

+
500Ω
--VCC
10000µF

Designated Transformer Power Supply (MG-250 equivalent)

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STK404-050

Internal Equivalent Circuit

TR7

R1
TR6
R4

TR1 TR2

R5 TR8
R2 C2

C1
TR5

TR3 TR4 D1 R3 R6

SUB

1 2 3 4 5 6 7 8 9 10

ITF02213

Sample Application Circuit

STK404-050
1 2 3 4 5 6 7 8 9 10

1kΩ
0.22Ω
10µF 1.8kΩ

+
100µF

IN 100Ω / 1W +
10µF

10µF

+
470pF

2.2µF +
4.7kΩ
56kΩ

+
100µF

+
+12V
+VCC
3pF + 4.7kΩ --VCC
47µF

4.7Ω / 1W
OUT
2.2µH
0.1µF

56kΩ
4.7Ω / 1W

RL

ITF02214

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STK404-050

Thermal Design Example

The heat sink thermal resistance, θc-a, required to handle the total power dissipated within this hybrid IC is determined as
follows:
Condition 1: The IC substrate temperature Tc must not exceed 125°C.
Pd × θc-a + Ta < 125°C ... (1)
Ta: Guaranteed ambient temperature for the end product.
Condition 2: The junction temperature of each transistor must not exceed 150°C.
Pd × θc-a + Pd/N × θj-c + Ta < 150°C ... (2)
N: Number of power transistors
θj-c: Thermal resistance per power transistor
We take the power dissipation in the power transistors to be Pd evenly distributed across those N power transistors.
If we solve for θc-a in equations (1) and (2), we get the following inequalities:
θc-a < (125 – Ta)/Pd ... (1)’
θc-a < (150 – Ta)/Pd – θj-c/N ... (2)’
Values that satisfy both these inequalities at the same time are the required heat sink thermal resistance values.
Determining the following specifications allows us to obtain the required heat sink thermal resistance from inequalities
(1)’ and (2)’:
• Supply voltage: VCC
• Load resistance: RL
• Guaranteed ambient temperature: Ta

Example:
Assume that the IC supply voltage, VCC, is ±26 V, RL is 6 Ω, and that the signal is a continuous sine wave. In this case,
from the Pd – PO characteristics, the maximum power will be 23 W for a signal with a frequency of 1 kHz.
For actual music signals, it is usual to use a Pd of 1/8 of POmax, which is the power estimated for continuous signals in
this manner. (Note that depending on the particular safety standard used, a value somewhat different from the value of
1/8 used here may be used.)
That is:
Pd = 15 W (when 1/8 POmax is 3.75 W)
The number, N, of power transistors in the hybrid IC's audio amplifier block is 2. Since the thermal resistance, θj-c, per
transistor is 3.0°C/W, the required heat sink thermal resistance, θc-a, for a guaranteed ambient temperature of 50°C will
be as follows:
From inequality (1)’: θc-a < (125 – 50)/15
< 5.0
From inequality (2)’: θc-a < (150 – 50)/15 – 3.0/2
< 5.17
Therefore, the thermal resistance that satisfies both these expressions at the same time is 5.0°C/W.
Note that this thermal design example assumes the use of a constant-voltage power supply, and is only provided as an
example for reference purposes. Thermal designs must be tested in an actual end product.

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STK404-050

THD — PO Pd — PO
2 35
VCC = ±26 V f = 1 kHz
10
RL = 6 Ω RL = 6 Ω

Total device power dissipation, Pd — W

7
Total harmonic distortion, THD — %

5 VG = 30 dB 30
VG = 30 dB

V
3

29
Tc = 25°C Tc = 25°C
2

=
Rg = 600 Ω 25 Rg = 600 Ω

CC
1.0 V

V
7 26
5
20
3
2 23 V
0.1 15
7
5
3 20 kHz 10
2
0.01
7 1 kHz 5
5
3 20 Hz
2 0
0.1 2 3 5 7 1.0 2 3 5 7 10 2 3 5 7 0.1 2 3 5 7 1.0 2 3 5 7 10 2 3 5 7
Output power, PO — W ITF02215 Output power, PO — W ITF02216
PO — VCC PO — f
50 60
THD = 0.4%
45
RL = 6 Ω
VG = 30 dB
Tc = 25°C THD = 10%
40 50
Rg = 600 Ω
Output power, PO — W

Output power, PO — W

35

%
30 , 0.4 40
THD = 0.4%
Hz
1k
25

VCC = ±26 V
20 30
RL = 6 Ω
VG = 30 dB
15
Rg = 600 Ω
10 20
Tc = 25°C
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 10 2 3 5 7 100 2 3 5 7 1k 2 3 5 7 10k 2 3
Supply voltage, ±VCC — V ITF02217 Frequency, f — Hz ITF02218

Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer’s
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer’s products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.
In the event that any or all SANYO products (including technical data, services) described or contained
herein are controlled under any of applicable local export control laws and regulations, such products must
not be exported without obtaining the export license from the authorities concerned in accordance with the
above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co., Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification”
for the SANYO product that you intend to use.
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 February, 2004. Specifications and information herein are subject
to change without notice.

PS No. 7342-5/5