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LM380 2.5W Audio Power Amplifier

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The LM380 is a 2.5W power audio amplifier for consumer applications. In order to hold system costs to a minimum, the gain is internally fixed at 34 dB. The output of LM380 is short circuit proof with internal thermal limiting.

 

Pin Description of LM380 IC

Pin Number

Pin Name

Description

1

Bypass

Bypass pin is used for connecting a decoupling capacitor

2

Non-Inverting Input (IN+)

The Non-Inverting pin is provided with the audio signal

3,4,5,7, 10, 11, 12

GND

Ground Pins

6

Inverting Input (IN-)

The Inverting Pin of an amplifier is normally grounded

8

VOUT

The output pin of the amplifier

14

VCC

Connected to power

9, 13

NC

Not Connected

 

LM380 Audio amplifier features and specifications

  • Supply Voltage: 10-22V
  • Quiescent Power: 0.13W @ 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
  • Available in 8-Pin & 14- Pin PDIP packages

 

Equivalent for LM380: LM386

Alternatives Audio Amplifiers: LM4871, AD620, IC6283, JRC45558

 

Where to use the LM380 Audio Amplifier

The LM380 is a low power audio amplifier used especially for power audio amplification purposes. The IC comes in 8-pin and 14-pin PDIP package and has a wide operating range hence it is highly easy to use. This IC can easily drive an 8-ohm speaker with a variable gain of 20 to200. The IC

 

So, if you are looking for an audio amplifier IC which can be powered using a battery for a portable application to drive an 8-ohm speaker then this IC might be the right choice for you.

 

How to use LM380 Audio Amplifier IC

The LM380 only requires a couple of capacitors and resistors to start working. A very basic commonly used circuit for LM380 is shown below.

                          LM380 Internal Circuit

The IC is powered using the pin 14 and the ground pin 4 is connected to the ground. The inverting pin is normally grounded and the Non-inverting pin is provided with the audio signal. This audio signal can be from a microphone or even from a 3.5mm jack. The 10k resistor is added in series with the audio signal to act as a volume control. You can ignore this potentiometer if you want to operate in full volume. This IC comes with a fixed voltage gain of 50dB.

 

Applications of LM380

  • AM and FM Radio amplifiers
  • Portable music players
  • Low Power Audio amplifiers
  • Wien bridge oscillator
  • Power Amplifiers
  • Audio boosters

 

2D-Model of LM380

LM380 Dimensions

Component Datasheet

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