LM1875t/Nopb LM1875 Audio Power Amplifier Chip IC 1-Channel (Mono) Class Ab

LM1875t/Nopb LM1875 Audio Power Amplifier Chip IC 1-Channel (Mono) Class Ab

The LM1875 is a Class-AB Audio Amplifier from Texas Instruments. It can deliver an output power of 20W into a 4Ω or 8Ω speaker with a maximum current of 4A. The IC can operate in single rail or dual rail power supply and is commonly used in high power audio amplifier designs.

Low frequency class AB amplifier most suited for audio amplification
Operating Voltage: 16V to 60V
Output: 20Watts with 4Ω/8 Ω speaker
Output Current: 4A
Open Loop Gain Gain: 90dB
Bandwidth: 70KHz
Short circuit and thermal protection is available
Breadboard friendly
Available in 5-pin TO220 package
Note: Complete Technical Details can be found at the LM1875 datasheet given at the end of this page.

Alternative to LM1875: TDA2050

Other Audio Amplifiers: LM386, TDA1554, TDA2030, TDA7294, TDA7265, TDA7279, TDA2005,

Introduction to LM1875
The LM1875 is a 20W Class AB audio amplifier with a wide operating voltage and high bandwidth. The IC can driver 20W speakers with a maximum current of 4A and can also go to a maximum of 30W. It can operate in both with single rail and dual rail power supply, and has some in-built protection features making it robust.

The LM1875 is breadboard friendly and hence can be easily tested using a breadboard. A sample application circuit for LM1875 is given below. The datasheet given at the bottom of this page consists of more details on this design.

LM1875 is a 5-pin Amplifier IC. The pin 5 and 3 are used to power the Amplifier IC, and the audio signal to be amplified is given in through pin 1 which is the non-inverting input. The amplified audio output can be obtained through pin 4. The values of the components given above are the values recommended by manufactures.

Applications
Used for Audio signal Amplification
Suitable for high power amplification
Capable of operating on dual/split power supply
Can be used to cascade audio speakers