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AN7118S - Schematic audio amplifier













AN7118S - Low Voltage Dual 35mW Audio Power Amplifier Circuits (BTL 300mW)

Overview

  • The AN7118S is the ICs designed for power amplifier of low voltage operated compact radio and stereo tape recorder. Stereo operation is enabled due to incorporating two amplifiers on one chip. Miniaturization of cassette and high integration is realized due to SOP package.
Features
  • Low voltage operation : VCC = 1.8V to 4.5V
  • Reduced voltage operation is available.
  • Low pop noise when supply voltage is switched ON and OFF
  • Stereo drive of 4½ (speaker) to 32½ (headphone) load is possible.
Pin Description:
 
Pin No. Pin Name Pin No. Pin Name
1
GND (Output)
10
GND (Input)
2
Output Ch.1
11
Input Ch.2
3
NC
12
N.F.B
4
Bootstrap
13
Phase Compensation
5
Phase Compensation
14
Phase Compensation
6
Phase Compensation
15
Bootstrap
7
N.F.B
16
NC
8
Input Ch.1
17
Output Ch.2
9
Vcc
18
Ripple Filter
18-Lead SOP Package (SOP018-P-0300)
18-Lead SOP Package (SOP018-P-0300)

Application Circuit from Panasonic Datasheet:

AN7118S power audio amplifier schematic


Supplementary Explanation of IC Characteristics

  • Not necessary for input coupling capacitor. Input electric potential is about 0 bias, using PNP Tr for input stage.
  • One chip dual amp. (Stereo operation)
  • Battery operation is possible at 1.8V to 4.5V
  • Decreased voltage operation is available, and suitable for a long battery operation.
  • Load impedance can be driven from 4½, which makes it possible to use for both speaker and headphone.
  • Small shock noise at power ON and OFF.
Datasheet for AN7118S 

 




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