Ordering number : ENN*7375
21604TN (OT) No. 7375-1/8
Overview
The STK403-400 series products are audio power
amplifier hybrid ICs that consist of optimally-designed
discrete component power amplifier circuits that have
been miniaturized using SANYO’s unique insulated metal
substrate technology (IMST). The adoption of a newly-
developed low thermal resistance substrate allows this
product to integrate six power amplifier channels in a
single compact package. The adoption of a standby circuit
in this device allows it to reduce impulse noise
significantly as compared to earlier Sanyo products, in
particular, the STK402-*00 series products.
Features
• Series of pin compatible power amplifiers ranging from
30 W/ch to 45 W/ch (10%/1 kHz) devices. The same
printed circuit board can be used depending on the
output power grade.
• Miniature packages
— 78.0 mm ×32.0 mm ×9.0 mm *
*: Not including the pins.
• Output load impedance: RL= 6 Ω
• Allowable load shorted time: 0.3 seconds
• Supports the use of standby and muting circuits.
Package Dimensions
unit: mm
4202-SIP28
Preliminary
SANYO: SIP28
[STK403-440]
STK403-440
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Six-Channel Class AB Audio Power Amplifier IC
25 W ×6 Channels
Thick-Film Hybrid IC
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.
No. 7375-2/8
STK403-440
Item Type No.
STK403-430 STK403-440 STK403-450
Output 1 (10%/1 kHz) 30 W ×6 ch 40 W ×6 ch 45 W ×6 ch
Output 2 (0.6%/20 Hz to 20 kHz)
20 W ×6 ch 25 W ×6 ch 30 W ×6 ch
Maximum supply voltage (No signal) ±36 V ±38 V ±40 V
Maximum supply voltage (6 Ω) ±34 V ±36 V ±38 V
Recommended supply voltage (6 Ω) ±23 V ±26 V ±28 V
Package 78.0 mm × 32.0 mm × 9.0 mm
Series Organization
Specifications
Maximum Ratings at Ta = 25°C
These products are organized as a series based on their output capacity.
Operating Characteristics at Tc = 25°C, RL= 6 Ω(noninductive load), Rg = 600 Ω, VG = 30 dB
Notes: 1. 1ch drive
2. Unless otherwise noted, use a constant-voltage supply for the power supply used during inspection.
3. 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.
4. Use the transformer power supply circuit shown in the figure below for allowable load shorted time measurement and output noise voltage
measurement.
5. Design applications so that the minus pre-VCC line (pin 17) is at the lowest potential at all times.
6. A limiting resistor that assures that the maximum operating current flowing into the standby pin (pin 23) does not exceed the maximum rating must
be included in application circuits. This IC operates when a voltage higher than VBE (about 0.6 V) is applied to the standby pin.
4700 µF
4700 µF
DBA30C
500 Ω
500 Ω
+VCC
--VCC
+
+
Designated Transformer Power Supply (RP-25 equivalent)
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage (No signal) VCC max(0) ±38 V
Maximum supply voltage VCC max(1) RL≥6 Ω±36 V
Minimum operating supply voltage VCC min ±10 V
Maximum operation flow-in current (pin 23)
IST OFF max 1.2 mA
Thermal resistance θj-c Per power transistor 3.6 °C/W
Junction temperature Tj max Both the Tj max and the Tc max conditions must be met. 150 °C
Operating IC substrate temperature Tc max 125 °C
Storage temperature Tstg –30 to +125 °C
Allowable load shorted time *4ts VCC = ±26.0 V, RL= 6 Ω, f = 50 Hz, PO= 25 W, 1ch drive 0.3 s
Parameter Symbol Conditions*1Ratings Unit
VCC (V) f (Hz) PO(W) THD (%) min typ max
PO(1) ±26.0 20 to 20 k 0.6 23 25
Output power *1PO(2) ±26.0 1 k 10 40 W
THD (1) ±26.0 20 to 20 k 5.0 VG = 30 dB 0.6
Total harmonic distortion *1THD (2) ±26.0 1 k 5.0 VG = 30 dB 0.03 %
Frequency characteristics fL, fH±26.0 1.0 +0 –3 dB
20 to 50 k
Hz
Input impedance ri ±26.0 1 k 1.0 55 kΩ
Output noise voltage *2VNO ±31.0 Rg = 2.2 kΩ1.0 mVrms
Quiescent current ICCO ±31.0 No loading 60 110 180 mA
Neutral voltage VN±31.0 –70 0 +70 mV
Current flowing into pin 23 IST ON ±26.0
V23 = 5 V, current limiting
0 mA
in standby mode *6
resistance: 6.2 kΩ
Current flowing into pin 23 IST OFF ±26.0 0.4 1.2 mA
in operating mode *6
No. 7375-3/8
STK403-440
Internal Equivalent Circuit
11
5 6 7 8
9
23
19
18
2
3
4
1
10
12
13
16
15
Pre driver IC
(CH2 / CH3)
Pre driver IC
(CH1)
Bias circuit
24 25 26 27
28
Pre driver IC
(CH5 / CH6)
22
21
20
17
14
Pre driver IC
(CH4)
ITF02247
C13
TR7
TR8
TR17
SUB
TR16
C16
C12
TR4
TR5
C15
TR13
TR14
C11
TR1
TR2
C14
TR10
TR11
TR9R24
R25
TR6
R22
R23
TR3R20
R21
R5
R6
R3
R4
R1
R2
TR12
R27
R26 TR15
R29
R28 TR18
R31
R30
R8
R7
R10
R9
R12
R11
C3C2
C1
C4 C5 C6
No. 7375-4/8
STK403-440
Sample Application Circuit
28272625242322212019181716151413121110
987654321
STK403-400 series
Ch1
OUT +PRE --PRE
Ch1
IN Ch1
NF Ch2
NF Ch2
IN Ch3
IN Ch3
NF Ch3
OUT Ch2
OUT +VCC --VCC --VCC +VCC Ch4
OUT Ch5
OUT SUB
GND GND
SUB
+PRE Ch4
IN Ch4
NF
BIAS
(ST-BY)
Ch5
NF Ch5
IN Ch6
IN Ch6
NF Ch6
OUT
Ch6
IN
Ch1
IN
Ch2
IN
Ch3
IN
Ch5
IN
Ch4
IN
1 kΩ2.2 µF
3 µF
0.1 µF
10 µF
100 µF
1 kΩ2.2 µF
1 kΩ2.2 µF
56 kΩ
470 pF
1 kΩ2.2 µF
56 kΩ
470 pF
1 kΩ2.2 µF
56 kΩ
470 pF
1 kΩ2.2 µF
56 kΩ
470 pF
56 kΩ
1.8 kΩ3 kΩ
3 kΩ
3 kΩ
6.2 kΩ
10 µF 1.8 kΩ
10 µF
470 µF
470 µF
1.8 kΩ
10 µF 1.8 kΩ
10 µF 1.8 kΩ
10 µF 1.8 kΩ
56 kΩ
56 kΩ56 kΩ
100 Ω
470 pF
4.7 Ω
4.7 Ω
3 µF
0.1 µF
4.7 Ω
4.7 Ω
4.7 Ω
3 µF
0.1 µF
4.7 Ω
3 µF
0.1 µF
4.7 Ω
4.7 Ω
4.7 Ω
3 µF
0.1 µF
4.7 Ω
4.7 Ω
3 µF
0.1 µF
4.7 Ω
3 pF
3 pF
56 kΩ
3 pF
56 kΩ
3 pF
56 kΩ
3 pF
3 pF
56 kΩ
470 pF
220 pF
220 pF
220 pF
3 kΩ
3 kΩ
3 kΩ
220 pF
220 pF
220 pF
+
+
+
+++
+
+
+
+++
+
+
+
Stand-by
control
*
Ch6
OUT
Ch5
OUT
Ch4
OUT
--VCC
+VCC
Ch2
OUT
Ch3
OUT
Ch1
OUT
ITF02248
*: Use a value for the limiting resistor that assures that the maximum operating current flowing into the standby pin (pin 23) does not exceed the maximum rating.
No. 7375-5/8
STK403-440
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, RLis 6 Ω, and that the signal is a continuous sine wave. In this case,
from the Pd – POcharacteristics, the maximum power will be 134 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 = 85 W (when 1/8 POmax is 3.1 W)
The number, N, of power transistors in the hybrid IC's audio amplifier block is 12. Since the thermal resistance, θj-c, per
transistor is 3.6°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)/85
< 0.88
From inequality (2)’: θc-a < (150 – 50)/85 – 3.6/12
< 0.87
Therefore, the thermal resistance that satisfies both these expressions at the same time is 0.87°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.
No. 7375-6/8
STK403-440
Stand-by & Mute Sample Application Circuit
28272625242322212019181716151413121110
987654321
STK403-400 series
Ch1
OUT +PRE --PRE
Ch1
IN Ch1
NF Ch2
NF Ch2
IN Ch3
IN Ch3
NF Ch3
OUT Ch2
OUT +VCC --VCC --VCC +VCC Ch4
OUT Ch5
OUT SUB
GND GND
SUB
+PRE Ch4
IN Ch4
NF
BIAS
(ST-BY)
Ch5
NF Ch5
IN Ch6
IN Ch6
NF Ch6
OUT
Ch6
IN
Ch1
IN
Ch2
IN
Ch3
IN
Ch5
IN
Ch4
IN
10 kΩ
10 kΩ
10 kΩ
2.2 kΩ
10 kΩ
+
+
+
+++
+
+
+
+
+++
+
+
+
Ch6
OUT
Ch5
OUT
Ch4
OUT
--VCC
+VCC
Ch2
OUT
Ch3
OUT
Ch1
OUT
ITF02249
*: Use a value for the limiting resistor that assures that the maximum operating current
flowing into the standby pin (pin 23) does not exceed the maximum rating.
10 kΩ
10 kΩ
10 kΩ
2.2 kΩ
10 kΩ
3 kΩ
33 kΩ
2 kΩ
33 µF
6.2 kΩ
Mute control
H : Single mute
L : Normal
Mute control
H : Single mute
L : Normal
*
Stand-by
control
H : Operation
L : Stand-by
Stand-by
control
Mute
control
+5
+5
ST-BY ST-BYPlay
Mute
Mute
No. 7375-7/8
STK403-440
Standby Mode Control
28272625242322212019181716151413121110
987654321
STK403-400 series
Ch1
OUT +PRE --PRE
Ch1
IN Ch1
NF Ch2
NF Ch2
IN Ch3
IN Ch3
NF Ch3
OUT Ch2
OUT +VCC --VCC --VCC +VCC Ch4
OUT Ch5
OUT SUB
GND GND
SUB
+PRE Ch4
IN Ch4
NF
BIAS
(ST-BY)
Ch5
NF Ch5
IN Ch6
IN Ch6
NF Ch6
OUT
+
ITF02250
3 kΩ
33 kΩ
2 kΩ
33 µF
/ 10 V
6.2 kΩ *
Stand-by control
H : Operation mode (+5 V)
L : Stand-by mode (0 V)
R1
IST= (applied voltage – VBE × 2) / R1
= (5--0.6 × 2) / 6.2 kΩ
≈ 0.63 (mA)
Current flowing in IST
ITF02263
V : 200 mV / 1div
T : 100 ms / 1div
OFF
(Stand-by
mode)
ON
(Operation
mode)
0.1 V
0.16 V
• Applied voltage (VST) ..................
• Current flowing into pin 23 (IST) ...
An internal transistor turns on when a voltage over 0.6 V is applied
and the IC enters into operating mode.
Use a value for the limiting resistor that assures that the maximum
operating current flowing into this pin due to the control voltage applied
by the microcontroller or other circuit does not exceed the maximum rating.
• Impulse noise that occurs at power on and power off can be reduced significantly by using a standby circuit.
• End product design is made easier by using a limiting resistor (*) to match the control voltage provided by the microcontroller or other control circuit.
• Standby control is available by controlling the current (IST) flowing into the standby pin (pin 23).
PS No. 7375-8/8
STK403-440
This catalog provides information as of February, 2004. Specifications and information herein are subject
to change without notice.
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.
THD — PO
ITF02255
1.00.1
7
5
0.1
0.01
3
7
5
3
2
7
5
3
2
2
2
1.0
10
2 3 5 2 3 57 72 3 5 7 10
Pd — PO
ITF02256
01.00.1
160
120
140
80
100
60
20
40
2 3 5 7 2 3 5 2 3 57 7
10
PO — VCC
Output power, PO — W
Supply voltage, ±VCC — V ITF02257
40
50
60
70
0
10
20
30
10 14 18 22 26 30 34 38
VCC = ±26 V
RL = 6 Ω
VG = 30 dB
Rg = 600 Ω
Tc = 25°C
6ch drive
RL = 6 Ω
f = 1 kHz
VG = 30 dB
Rg = 600 Ω
Tc = 25°C
6ch drive
THD = 10%
THD = 0.6%
f = 20 kHz, THD = 0.6%
Total harmonic distortion, THD — %
Output power, PO — W
Total device power dissipation, Pd — W
Output power, PO — W
PO — f
Output power, PO — W
Frequency, f — Hz ITF02258
1k10 100
50
20
30
40
2 3 5 7 2 3 5 7 2 3 5 7 2 3
10k
THD = 10%
THD = 0.6%
VCC = ±26 V, RL = 6 Ω
VG = 30 dB, Rg = 600 Ω
Tc = 25°C
6ch drive
VCC = ±26 V
RL = 6 Ω
f = 1 kHz
VG = 30 dB
Rg = 600 Ω
Tc = 25°C
6ch drive
(same output rating)
f = 20 kHz
f = 1 kHz
