ICs for Audio Common Use
n Overview
The AN7148 is an integrated circuit designed for power
amplifier of 2.1W (9V, 4Ω) output. Stereo operation is
enabled due to incorporating two amplifiers on one chip.
It is most suitably used for battery operated set such as
radio cassette recorder because quiescent circuit current
is small comparing to current power amplifier. Low distor-
tion and low noise are realized and external components
are very few. 12-pin SIL package has realized compact
and high density mounting of a set.
n Features
• Low quiescent current
• High operation stability
• Low radiation
• Low distortion
• Low noise
• Low shock noise from power ON/OFF operation
• Fewer external components
AN7148
Dual 2.1W Audio Power Amplifier Circuit
29.96
–
0.3
29.6
–
0.3
12
1
Unit : mm
28.0
–
0.3
20.0
–
0.2
5.9– 0.25 7.7– 0.3 7.8– 0.25
1.2
–
0.1
2.54
0.6
–
0.1
3.5
–
0.3
0.35
+ 0.1 – 0.05
ø 3.6
R1.8
0.6
12-Lead SIP Package with Fin (HSIP012-P-0000A)
n Block Diagram
Input
Circuit
Driver
Circuit
Output
Circuit
VCC
1 11
2
3
6 4 9 8
12
10
GND (Output)GND (Input)
5 7
Input
Circuit
Driver
Circuit
Output
Circuit
Over Temperature
Protection
Ch.1
Ch.2
n Pin Descriptions
Pin No. Pin Name
1
2
3
4
5
6
N.F.B Ch.1
Input Ch.1
Ripple Filter
GND (Input)
Input Ch.2
N.F.B Ch.2
Pin No. Pin Name
7
8
9
10
11
12
Output Ch.2
Bootstrap Ch.2
GND (Output)
VCC
Bootstrap Ch.1
Output Ch.1