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# Sixth Lichuang Electric Competition #DIY small desktop amplifier

Overview

The TPA3138D2 is a high-efficiency, low-idle-current Class D stereo audio amplifier with 10W per channel. It can drive stereo speakers with loads as low as 3.2Ω. In 1SPW mode, it consumes a low idle current of only 21mA (12V) and operates as low as 3.5V, enabling longer audio playback times and improved power sensitivity of Bluetooth speakers, battery-operated devices and other devices Achieve precise performance within the thermal performance range of your application.

IC characteristics:

• Wide supply voltage range 3.5V to 14.4V

– 2× 10W at 6Ω, 1% THD+N, 12V power supply

– 1x 18.5W at 4Ω, 10% THD+N, 12V supply

– Under 1W, 1kHz input, 6Ω conditions, THD+N is 0.04%

• Longer battery life for portable applications:

– 20mA idle current (12V) in 1SPW mode – >90% Class D efficiency

• Reduced solution size and cost:

– Operation without inductor

– Complies with EN55013 and EN55022EMC standards when no inductor is used

– No external heat sink required

• Flexible audio solutions:

– Single-ended or differential analog input

– Selectable gain: 20dB and 26dB

– No clicks when starting up

• Comprehensive protection and automatic recovery:

– Pin-to-pin, pin-to-ground, pin-to-power short circuit protection

– Thermal protection, under-voltage protection and over-voltage protection

– Power limiter and DC speaker protection

Physical map:

question:

1. Due to material limitations, the speakers are disassembled from old headphones and have low power;

2. The audio input uses a waste headphone cable, and the two outputs of the headphone cable are connected to the two inputs of the power amplifier;

3. According to the actual test, there is no problem when connecting to the audio output of the mobile phone, but the noise will be louder when connected to the computer. Due to time issues, it has not been solved yet;

4. When no audio input is connected, there will be current noise when the human body touches the audio input of the amplifier board, which has not yet been resolved.

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-06-19 17:58:00

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