This Audio Amplifier Module is based on PAM8403 which is a 3W, class-D audio amplifier. It offers low THD+N, allowing it to achieve high-quality sound reproduction. The new filterless architecture allows the device to drive the speaker directly, requiring no low-pass output filters, thus saving system cost and PCB area. With the same numbers of external components, the efficiency of the PAM8403 is much better than that of Class-AB cousins. It can extend the battery life, which makes it well-suited for portable applications.
- Low THD+N.
- Thermal Shutdown.
- Superior Low Noise.
- Short Circuit Protection.
- High amplification efficiency 90%.
- Works with 2.5V-5v power supply.
- Output Power: 3 W + 3 W at 4 ohm.
- Good sound quality & noise suppression.
- Can use a computer USB power supply directly.
- Filterless, Low Quiescent Current, and Low EMI.
- Can directly drive 4 Ohm/8 Ohm small speakers.
- Dual-channel stereo output 3 w + 3 w power Class D.
- 3W Output at 10% THD with a 4Ω Load and 5V Power Supply.
- Small Size, 2.11 x 1.85 cm BOB can easily fit in a variety of products.
NOTE: Violating these safety measures may lead to total product damage and such products are not eligible for refund or replacement.
- Input audio should be via shielded wire for the best performance.
- Use properly filtered and regulated power supply.
- Take care not to short speaker wires else IC will get damaged.
- Make sure the power supply never exceeds 5.5V else IC will get damaged.
- The module should be connected with the speaker before it’s powered on, otherwise, the module may damage easily.
Recommended Operating Conditions:
|Supply Voltage Range||3.3 to 5.5||V|
|Operation Temperature Range||-40 to +85||°C|
- It’s better to add a ferrite chip bead at the outgoing line of the speaker for suppressing the possible electromagnetic interference.
- Using a Li-Ion battery without BMS and charge controller will probably damage the module. Therefore, it’s recommended to use a Li-Ion battery with a TP4050 module or Buck converter, or four Ni-MH (Nickel Metal Hydride) rechargeable batteries or 3 dry or alkaline batteries.
- One should not make the input signal too large. A large signal can cause the clipping of the output signal when increasing the volume. This will damage the IC because of the big gain of the PAM8403.
- When testing the PAM8403 module by using a resistor instead of a speaker as the output load, the test results, e.g. THD or efficiency, will be worse than those of using the speaker as load.