Mono 2.5W Class D Audio Amplifier - PAM8302

Adafruit Mono 2.5W Class D Audio Amplifier - PAM8302
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Price: £4.80
(£4.00 + VAT)
Stock Quantity: 16
Model: PAM8302
Manufacturer: Adafruit
Average Rating: Not Rated

Adafruit

Mono 2.5W Class D Audio Amplifier - PAM8302

This super small mono amplifier is surprisingly powerful - able to deliver up to 2.5 Watts into 4-8 ohm impedance speakers. Inside the miniature chip is a class D controller, able to run from 2.0V - 5.5VDC. Since the amp is a class D, its very efficient (over 90% efficient when driving an 8Ω speaker at over half a Watt) - making it perfect for portable and battery-powered projects. It has built in thermal and over-current protection but we could barely tell it got hot. There's even a volume trim pot so you can adjust the volume on the board down from the default 24dB gain. This board is a welcome upgrade to basic "LM386" amps!

The A+ and A- inputs of the amplifier go through 1.0uF capacitors, so they are fully 'differential' - if you don't have differential outputs, simply tie the Audio- pin  to ground. The output is "Bridge Tied" - that means the output pins connect directly to the speaker pins, no connection to ground. The output is a high frequency 250KHz square wave PWM that is then 'averaged out' by the speaker coil - the high frequencies are not heard. All the above means that you can't connect the output into another amplifier, it should drive the speakers directly.

Comes with a fully assembled and tested breakout board. We also include header to plug it into a breadboard and a 3.5mm screw-terminal blocks so you can easily attach/detach your speaker. Speaker is not included, use any 4 ohm or greater impedance speaker.

Features

  • Output Power: 2.5W at 4Ω, 10% THD, 1.5W at 8Ω, 10% THD, with 5.5V Supply
  • 50dB PSRR at 1KHz
  • Filterless design, with ferrite bead + capacitors on output.
  • Fixed 24dB gain, onboard trim potentiometer for adjusting input volume.
  • Thermal and short-circuit/over-current protection
  • Low current draw: 4mA quiescent and 1uA in shutdown mode

Documents

PAM8302A Datasheet

 

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Mono 2.5W Class D Audio Amplifier - PAM8302
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Mono 2.5W Class D Audio Amplifier - PAM8302
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