SANYO STK402-240 Service Manual
Ordering number : ENN7070
N1102AS (OT) No. 7070-1/4
Overview
The STK402-200 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). SANYO has adopted a new
low thermal resistance substrate in these products to
reduce the package size by about 60% as compared to the
earlier SANYO STK408-000 series.
Features
• Series of pin compatible power amplifiers ranging from
20 W × 3 channels to 60 W × 3 channels (10%/1 kHz)
devices. The same printed circuit board can be used
depending on the output power grade.
• The pin arrangement is compatible with that of the 2channel STK402-000 series. This means that 3-channel
printed circuit boards can also be used for 2-channel
products.
• Miniature packages
— 15 W/ch to 40 W/ch (THD = 0.4%, f = 20 Hz to
20 kHz); 59.2 mm × 31.0 mm × 8.5 mm *
*: Not including the pins.
• Achieves superlative heat dissipation due to the adoption
of SANYO's Insulated Metal Substrate Technology
(IMST).
• Output load impedance: RL= 6 Ω
• Allowable load shorted time: 0.3 seconds
• Supports the use of standby, muting, and load shorting
protection circuits.
Package Dimensions
unit: mm
4191-SIP19
SANYO: SIP19
[STK402-240]
STK402-240
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Three-Channel Class AB Audio Power Amplifier IC
25 W + 25 W + 25 W
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. 7070-2/4
STK402-240
Item
Type No.
STK402-220 STK402-230 STK402-240 STK402-250 STK402-270
Output 1 (10%/1 kHz) 20 W + 20 W + 20 W 30 W + 30 W + 30 W 40 W + 40 W + 40 W 45 W +45 W +45 W 60 W + 60 W + 60 W
Output 2 (0.4%/20 Hz to 20 kHz)
15 W + 15 W + 15 W 20 W + 20 W + 20 W 25 W + 25 W + 25 W 30 W + 30 W + 30 W 40 W + 40 W + 40 W
Maximum supply voltage
±30 V ±34 V ±38 V ±40 V ±50 V
(No signal)
Maximum supply voltage
±28 V ±32 V ±36 V ±38 V ±44 V
(6 Ω)
Recommended supply voltage
±19 V ±22 V ±25 V ±26.5 V ±30 V
(6 Ω)
Package 59.2 mm × 31.0 mm ×8.5 mm
Series Organization
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage (No signal) V
CC
max(1) ±38 V
Maximum supply voltage V
CC
max(2) RL= 6 Ω, 8 Ω ±36 V
Thermal resistance θj-c Per power transistor 3.5 °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 *
2
ts VCC= ±25 V, RL= 6 Ω, Tc = 25°C, f = 50 Hz, PO= 25 W, 1ch drive 0.3 s
Specifications
Maximum Ratings at Ta = 25°C
These products are organized as a series based on their output capacity.
Parameter Symbol
Conditions*
1
Ratings
Unit
V
CC
(V) f (Hz) PO(W) THD (%) min typ max
P
O
(1) ±25.0 20 to 20 k 0.4 25
Output power P
O
(2) ±25.0 1 k 10 40 W
P
O
(3) ±25.0 20 to 20 k 0.4 at 8 Ω
23
Total harmonic distortion
THD (1) ±25.0 20 to 20 k 1.0 0.4
%
THD (2) ±25.0 1 k 5.0 0.01
Frequency characteristics f
L
, f
H
±25.0 1.0 +0 –3 dB
20 to 50 k
Hz
Input impedance ri ±25.0 1 k 1.0 55 kΩ
Output noise voltage *
3
V
NO
±30.0 Rg = 2.2 kΩ 1.2 mVrms
Quiescent current I
CCO
±30.0 10 60 110 mA
Neutral voltage V
N
±30.0 –70 0 +70 mV
Operating Characteristics at Tc = 25°C, RL= 6 Ω (noninductive load), Rg = 600 Ω, VG = 30 dB
Notes: 1. Unless otherwise noted, use a constant-voltage supply for the power supply used during inspection.
2. Use the transformer power supply circuit stipulated in the figure below for allowable load shorted time measurement and output noise voltage
measurement.
DBA40G
4700 µF
4700 µF
500 Ω
500 Ω
+V
CC
--V
CC
Stipulated Transformer Power Supply (RP-25 equivalent)
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.
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