PAM8403 Mini 5V Digital Audio Amplifier Board 2x3W
Internal Reference:
KIT.AMP.PAM8403
PAM8403 Mini Digital Audio Amplifier Module – 2×3W, 5 V DC (Mono/Stereo Applications)
Description:
Ultra-compact Class‑D stereo amplifier module using the PAM8403 IC. Operates from a 5 V rail and delivers up to 3 W per channel. Ideal for portable or microcontroller-based DIY audio projects needing efficient and clear sound.
Key Features:
- Dual-channel stereo amplifier: 3 W + 3 W output (with 4 Ω speakers at 5 V)
- Operates on 2.5 V to 5.5 V DC (best at 5 V)
- Supports 4 Ω to 8 Ω speaker loads
- High overall efficiency (around 85–90 %) with minimal output filtering required
- Filter‑less architecture: no external LC low‑pass is needed for speaker interface
- Built-in protections: short-circuit, thermal shutdown (~140 °C), under-voltage lockout
Technical Specifications:
| Feature | Specification |
|---|---|
| Amplifier IC | PAM8403 (Class‑D) |
| Gain | Fixed (max 24 dB, ~200 × gain) |
| Operating Voltage | 2.5 V – 5.5 V DC (optimal at 5 V) |
| Output Power | Up to 3 W × 2 channels (at 4 Ω, 5 V) |
| Supported Speaker Load | 4 Ω – 8 Ω |
| Efficiency | ~85–90 % |
| Protections | Short-circuit, under-voltage lockout, thermal shutdown |
| Frequency Response | Broad bandwidth, typically >300 kHz capability |
| Board Dimensions | ~29.5 * 20.2 * 15mm (length × width × thickness) |
| Net Weight | ~1 g |
Usage Notes:
- Provide a stable 5 V DC supply capable of supplying at least 500 mA for both channels.
- Use 4 Ω speakers for maximum output and volume; 8 Ω speakers reduce power output.
- Avoid input signal voltages above approx. 0.4 V peak-to-peak to prevent clipping.
- Ensure correct polarity; reverse voltage can damage the IC.
- Thermal protection will shut down the amplifier if internal die temperature exceeds ~140 °C.
- Outputs cannot be combined (tie negative channels together), as this may damage the board.
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