PAM8403 Stereo Audio Amplifier Module

26 May 2020 - 0 Comments

PAM8403 Audio Amplifier Module

PAM8403 Module Pinout

The PAM8403 is a 2-channel, 3W, class-D audio amplifier module that features low harmonic distortion and high efficiency. It offers low THD+N, allowing it to achieve high-quality sound reproduction. Operating voltage for this module range from 2.5 V to 5.5 V, making it ideal for adding the audio capability to your MP3 and MP4 player projects.

PAM8403 Module Pinout Configuration

Pin No.	Pin Name	Description
1	+OUT_L	Left Channel Positive Output
2	-OUT_L	Left Channel Negative Output
3	INL	Left Channel Input
4	INR	Right Channel Input
5	-OUT_R	Right Channel Negative Output
6	+OUT_R	Right Channel Positive Output
7	5V	Positive Supply
8	GND	Ground Pin

Specifications

2 channels 3 W PAM8403 audio amplifier
Output Power: 3 W + 3 W (at 4 ohm)
Working Voltage: 2.5 to 5.5 V
Board Size: 24 x 15 mm
High amplification efficiency 85%
Unique without LC filter class D digital power board
Can use computer USB power supply directly

Alternatives

XH-M228

Brief about PAM8403 Module

The PAM8403 is a 2-channel, 3W, class-D audio amplifier. The internal circuit diagram of the PAM8403 Module is shown below. The new filterless architecture allows the device to drive the speaker directly, requiring no low-pass output filters. With the same numbers of external components, the efficiency of the PAM8403 is much better than that of Class-AB cousins. As shown in circuit diagram output speakers connects to ± OUT_L and ± OUT_R directly. INL and INR pins are used for left and right channel input. These pins are connected through a 0.47µf ceramic capacitor to reduce noise caused by the power supply coupling into the output drive signal. The recommended operating voltage for PAM8403 is 5.5V.

PAM8403 Module Internal Circuit Diagram