Panasonic AN7125 Service Manual
ICs for Audio Common Use
AN7125
Dual Channel BTL Power Amplifier
■ Overview
AN7125 is a monolithic integrated circuit designed for
13.5 W (12 V,4 Ω) output audio power amplifier.It is a
dual channel BTL IC suitable for stereo operation in radio
cassette and TV application.
■ Features
• Built-in muting pin
• Built-in stand by pin
• Built-in thermal shutdown protection circuit
• Built-in current limiting circuit
• High power :(13.5 W/12 V/4 Ω)
(13.0 W/15 V/8 Ω)
• Few external components
• Operating voltage range 6 V ∼ 18 V (12 V typ.)
■ Applications
•
Radio-cassette
■ Block Diagram
28.0±0.3
29.75±0.30
φ3.6
(10.0)(10.0)
20.0±0.3
R1.8
0.6
1.2±0.1
HSIP012-P-0000A
7.7±0.3
(12.5)
21.9±0.3
19.1±0.3
(1.2)
Unit : mm
121
(1.27) (1.3)
(1.27)
+0.15
–0.05
0.6
2.54
+0.10
–0.05
1.45±0.151.80±0.15
0.25
29.6±0.3
3.5±0.3
REF
TSD
protection
circuit
Standby
circuit
1
2
3
4
5
CC
V
GND
6
Mute
7
GND
8
9
10
11
12
GND
1
AN7125 ICs for Audio Common Use
■ Pin Descriptions
Pin No. Description
1V
CC
2 ch.1 + ve Phase Output
3 ch.1 Output GND
4 ch.1−ve Phase Output
5 Standby
6 ch.1 Input
■ Absolute Maximum Ratings
Parameter Symbol Ratings Unit
Supply voltage
Supply current I
Power dissipation
Operating ambient temperature T
Storage temperature T
Note) *1: Without input signal,VCC is up to 24 V
*2:Ta = 75 °C.
*1
2
*
V
CC
CC
P
D
opr
stg
Pin No. Description
7 Pre GND
8 ch.2 Input
9 Mute
10 ch.2 −ve Phase Output
11 ch.2 Output GND
12 ch.2 +ve Phase Output
24 V
6.0 A
38.5 W
−25 to +75 °C
−55 to +150 °C
■ Recommended Operating Range
Parameter Symbol Range Unit
Supply voltage V
CC
6.0 to 18.0 V
■ Electrical Caracteristics at VCC = 12 V, RL = 4 Ω, freq. = 1 kHz, 2 channel outputs, Ta = 25 °C
Parameter Symbol Conditions Min Typ Max Unit
Quiescent circuit current I
Output noise voltage
*1
V
Voltage gain G
Total harmonic distortion
*2
THD VIN = 20 mV 0.07 0.4 %
Maximum output power P
Channel balance CB VIN = 20 mV −10 1dB
Channel crosstalk
*2
Output offset voltage V
Ripple rejection
*1
Standby current I
Muting effects
Note) *1: With a filter band 20 Hz to 20 kHz(12 dB/OCT)used.
*2: With a filter band 400 Hz to 30 kHz used.
*2
MT VIN = 20 mV 70 80 dB
VIN = 0 mV 100 210 mA
CQ
VIN = 0 mV,RG = 6.2 kΩ0.27 0.5 mVrms
NO
VIN = 20 mV 38 40 42 dB
VC
THD = 10 % 10 12 W
O
CT VIN = 20 mV,RG = 6.2 kΩ 55 70 dB
RG = 6.2 kΩ−350 0 350 mV
OFF
RR VR = 1 V
VIN = 0 mV 110µA
STB
= 120 Hz,RG = 6.2 kΩ 50 60 dB
rms,fR
2
ICs for Audio Common Use AN7125
■ Terminal Equivalent Circuit
Pin No. Equivalent Circuit Function Status
1 V
: typ. : 12 V
CC
VCC input
2 ch.1 O/P : V
1
CC
/2
ch.1 positive phase output pin.
ドライバ回路
プリアンプ
3 ch.1 Power GND : 0 V
ドライバ回路
4 ch.1 O/P : VCC/2
600 Ω
30 kΩ
Pin2
4
ch.1 output power ground pin.
3
ch.1 inverse phase output pin.
VCC/2
5 Standby : VTH = 2.8 V
1
5
100 Ω
100 Ω
30 kΩ
This is the standby control pin.
STB off > 3.5 V
STB on = 0 V/GND
5 kΩ
5 kΩ
10 kΩ
2 kΩ
2 kΩ
8
6 ch.1 Input : 0 V
200 Ω
Pin6,8
7
400 Ω
30 kΩ
This is the amplifier input pin.
7 Pre GND : 0 V
Input ground pin.
3
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