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tps54560电感啸叫

bai zhao
Prodigy 60 points
Other Parts Discussed in Thread: TPS54560, TPS54560B

做了块电源板，tps54560上电啸叫。空载时声音较小，加水泥电阻后，声音变大，比较刺耳。降低输入电压，声音略有减小，降低到5.8V左右，才彻底消失。原理图，PCB以及SW管教测试波形如图。