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3255 Digital Power Amplifier

Overview

The TPA3255DDVR digital amplifier is a dual-channel 300W stereo digital amplifier with adjustable gain and low distortion. This is the most stable version after three improvements. A heatsink is recommended for the chip to achieve optimal performance.
The inductors used are KEDA CPD1715F high-current inductors, known for their excellent sound quality. Using other lower-quality inductors may result in issues such as inductor "singing" (overheating) and excessive heat generation; KEDA inductors are the preferred choice.
The op-amp has a gain of 6x; the gain can be adjusted by modifying the values of resistors R9 and R25.
Use high-power resistors for the output RC filter to prevent resistor burnout.

Design Files

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Update:2026-03-28 10:48:22

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