R1R2, R3R4, and several patch jumper pads are responsible for configuring the switching frequency, power limit, etc. of the IC. Please refer to the chip Datasheet. Please use T68-2 magnetically surrounded 10uH inductor as the filter inductor. When the switching frequency is 400kHz, it is recommended to use 1uF as the output filter capacitor, and 0.68uF for 500kHz and 600kHz. Heat sink Taobao 28x14x11mm, with glue.
The power amplifier input adopts pseudo-differential tapping method, which can significantly suppress the noise caused by the ground loop.
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