Key Features
- Output Power: 3.7W at 3Ohm, 10% THD, 1.7W at 8Ohm, 10% THD, with 5V Supply
- Passes EMI limit unfiltered with up to 12 inches (30 cm) of speaker cable
- Spread-Spectrum Modulation and Active Emissions Limiting
- Excellent click-and-pop suppression
- Thermal and short-circuit/over-current protection
This incredibly small stereo amplifier is surprisingly powerful - able to deliver 2 x 3.7W channels into 3 ohm impedance speakers. Inside the miniature chip is a class D controller, able to run from 2.7V-5.5VDC. Since the amp is a class D, its incredibly efficient (over 90% efficient when driving an 8Ω speaker at over 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. This board is a welcome upgrade to basic "LM386" amps!
The inputs of the amplifier go through 1.0uF capacitors, so they are fully 'differential' - if you don't have differential outputs, simply tie the R- and L- to ground. The outputs are "Bridge Tied" - that means they connect directly to the outputs, no connection to ground. The output is a 360KHz 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.
Item Specifics
1 - breakout board (fully tested and assembled)
1 - 9-pin header
2 - blue or black 3.5mm screw terminal blocks
1 - 2x4 header + jumper
Size: 28.25mm x 24.15mm x 3.03mm
Weight:2.33g
- High 83dB PSRR at 217Hz
- Five pin-selectable gains: 6dB, 9dB, 12dB, 15dB and 18dB. Select with a jumper or by setting the G and G' breakout pins
- Low current draw: 2mA quiescent and 10uA in shutdown mode