Mini Bridge Audio Power Amplifier

Friday, January 6th, 2017 - Audio

Mini Bridge Audio Power Amplifier

The LM380 is a power audio amplifier for consumer applications. In order to hold system cost to a minimum, gain is internally fixed at 34 dB. The LM380 can be made a Mini Bridge Audio Power Amplifier. The output automatically selfcenters to one-half the supply voltage. The output is short circuit proof with internal thermal limiting. The package outline is standard dual-in-line. The LM380N uses a copper lead frame. The center three pins on either side comprise a heat sink. So, We can make “Mini Bridge Audio Power Amplifier” with LM380 so easy. Uses include simple phonograph amplifiers, intercoms, line drivers, teaching machine outputs, alarms, ultrasonic drivers, TV sound systems, AM-FM radio, small servo drivers, power converters, etc.

The LM380 is a power audio amplifier intended for consumer applications. It features an internally fixed gain of 50 (34 dB) and an output which automatically centers itself at one-half of the supply voltage. A unique input stage allows inputs to be ground referenced or AC coupled as required. The output stage of the LM380 is protected with both short circuit current limiting and thermal shutdown circuitry. All of these internally provided features result in a minimum external parts count integrated circuit for audio applications.
This paper describes the circuit operation of the LM380, its power handling capability, methods of volume and tone control, distortion, and various application circuits such as a bridge amplifier, a power supply splitter, and a high input impedance audio amplifier.

Features Of Mini Bridge Audio Power Amplifier wit LM380

  • Wide supply voltage range: 10V-22V
  • Low quiescent power drain: 0.13W (VS= 18V)
  • Voltage gain fixed at 50
  • High peak current capability: 1.3A
  • Input referenced to GND
  • High input impedance: 150kΩ
  • Low distortion
  • Quiescent output voltage is at one-half of the supply voltage
  • Standard dual-in-line package

Mini Bridge Audio Power Amplifier Schematic Circuit

Mini Bridge Audio Power AmplifierWiring Circuit Mini Bridge Audio Power Amplifier

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