LG STK402 070 Service Manual

Ordering number : ENN7047

92801RM (OT) No. 7047-1/6

Overview

The STK402-000 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 STK407-000 series.

Features

• Series of pin compatible power amplifiers ranging from

20 W × 2 channels to 120 W × 2 channel (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 3­channel STK402-200 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); 46.6 mm × 25.5 mm × 8.5 mm *

— 50 W/ch to 80 W/ch (THD = 0.4%, f = 20 Hz to

20 kHz); 59.2 mm × 31.0 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.

Package Dimensions

unit: mm

4189-SIP15

SANYO: SIP15

[STK402-070]

STK402-070

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

Two-Channel Class AB Audio Power Amplifier IC

40W + 40W

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. 7047-2/6

STK402-070

Item

Type No.

STK402-020 STK402-030 STK402-040 STK402-050 STK402-070 STK402-090 STK402-100 STK402-120

Output 1 (10%/1 kHz) 20 W + 20 W 30 W + 30 W 40 W + 40 W 45 W +45 W 60 W + 60 W 80 W + 80 W

100 W + 100 W120 W + 120 W

Output 2 (0.4%/20 Hz to 20 kHz)

15 W + 15 W 20 W + 20 W 25 W + 25 W 30 W + 30 W 40 W + 40 W 50 W + 50 W 60 W + 60 W 80 W + 80 W

Maximum supply voltage

±30 V ±34 V ±38 V ±40 V ±50 V ±54 V ±57 V ±65 V

(No signal)
Maximum supply voltage

±28 V ±32 V ±36 V ±38 V ±44 V ±47 V ±50 V ±57 V

(6 Ω)
Recommended supply voltage

±19 V ±22 V ±25 V ±26.5 V ±30 V ±32 V ±35 V ±39 V

(6 Ω)

Package 46.6 mm × 25.5 mm × 8.5 mm 59.2 mm × 31.0 mm × 8.5 mm

Series Organization

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage (No signal) V

CC

max(0) ±50 V

Maximum supply voltage V

CC

max(1) RL= 6 Ω ±44 V
Thermal resistance θj-c Per power transistor 3.2 °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 ts V

CC

= ±30.0 V, RL= 6 Ω, f = 50 Hz, PO= 40 W 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

Output power P

O

(1) ±30.0 20 to 20 k 0.4 38 40

W

(continuous output) P

O

(2) ±30.0 1 k 10 60

Total harmonic distortion

THD (1) ±30.0 20 to 20 k 1.0 VG = 30 dB 0.4

%

THD (2) ±30.0 1 k 5.0 VG = 30 dB 0.01

Frequency characteristics f

L

, f

H

±30.0 1.0 +0 –3 dB

20 to 50 k

Hz
Input impedance ri ±30.0 1 k 1.0 55 kΩ
Output noise voltage *

2

V

NO

±36.0 Rg = 2.2 kΩ 1.2 mVrms

Quiescent current I

CCO

±36.0 10 40 80 mA

Neutral voltage V

N

±36.0 –70 0 +70 mV

Operating Characteristics at Ta = 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. 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.
Use the transformer power supply circuit stipulated in the figure below for output noise voltage measurement.

3. Use the transformer power supply circuit stipulated in the figure below for allowable load shorted time measurement.

DBA40C

10000µF

10000µF

500Ω

500Ω

+V

CC

--V

CC

Stipulated Transformer Power Supply (MG-200 equivalent)

No. 7047-3/6

STK402-070

Internal Equivalent Circuit

TR4

TR1

TR6

R2 R7

R1

R3

R4

R6

C1

R5

TR3

TR2

1

4

2

13

7125 6

TR5

TR7

TR8

D1

SUB

TR11

TR15

TR13

R14R9

R13

R11

R12

R8

C2

R10

TR16

TR14

11

9

10

8

14 15

TR12

TR9

TR10

Sample Application Circuit

Ch.1INCh.1

NF

Pre

-V

CC

Pre
+V

CC

-V

CC

+V

CC

BIAS

Ch.2
+VE

Ch.2
NF

SUB
GND

Ch.2
IN

Ch.2

-VE

Ch.1
+VE

Ch.1

-VE

1 2 4 5 6 7 8 9 10 11 12 13 14 15

Ch.2 IN

-V

CC

470pF0.1µF

1.8kΩ

56kΩ

10kΩ

0.22Ω

0.22Ω

0.22Ω

0.22Ω

4.7Ω

33µF

3pF

220pF

2.2µF

1kΩ

56kΩ

100µF

10µF

100Ω

3µH

SUB

Ch.2 OUT

4.7Ω

Ch.1 IN

+V

CC

470pF

0.1µF

1.8kΩ

56kΩ

4.7Ω

33µF

3pF

220pF

2.2µF

1kΩ

56kΩ

100µF

10µF

100Ω

3µH

Ch.1 OUT

4.7Ω

Ch.2Ch.1