Stereo 2.1W Class D Audio Amplifier – TPA2012 (ID: 1552) Adafruit

DESCRIPTION

This incredibly small stereo amplifier is surprisingly powerful – able to deliver 2 x 2.1W channels into 4-ohm impedance speakers (@ 10% THD). Inside the miniature chip is a class D controller, able to run from 2.7V-5.5VDC. Since the amp is a class D, it’s incredibly efficient (89% efficient when driving an 8Ω speaker at 1.5 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” – which means they connect directly to the outputs, with no connection to ground. The output is a ~300KHz 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 to another amplifier, it should drive the speakers directly.

Comes with a fully assembled and tested breakout board with 1.0uF input capacitors. Also includes a dual mini DIP switch for setting the amplifier gain on the fly, 3.5mm screw-terminal blocks so you can easily attach/detach your speakers, and some header in case you want to plug it into a breadboard. You will be ready to rock in 15 minutes!

Please Note:

• Speakers are not included, use any 4 ohm or 8 ohm impedance speakers.

FEATURES

• Output Power: 2.1W at 4Ω, 10% THD, 1.4W at 8Ω, 10% THD, with 5V Supply
• PSRR: 77 dB typ @ 217 Hz with 6 dB gain
• Dimensions (without 0.1″ header): 22.96mm / 0.9″ x 28.33mm / 1.11″ x 4.97mm / 0.19″
• Weight: 2.56g
• Designed for use without an output filter, when wires are kept at under 2″-4″ long
• Four pin-selectable gains: 6dB, 12dB, 18dB and 24dB. Select with the onboard switches or by setting the G0 and G1 breakout pins (see schematic for breakout board showing gain pin settings for details)
• Excellent click-and-pop suppression
• Thermal shutdown protection
• Independent channel shutdown
• Low current draw: typ 6mA quiescent and 1.5uA in shutdown mode

RESOURCES

• TPA2012 datasheet
• TPA2012 2.1W Stereo Audio Amplifier – Add a little audio amplifier with ease
• Flora-Powered TARDIS Costume (for Dogs!)
• Trinket Audio Player