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LM3409HV外部PWM调光电路电感啸叫

xiansheng yang
Prodigy 90 points
Other Parts Discussed in Thread: LM3409HV

亲！ 我做的LM3409HV外部PWM调光电路 通电后没有接PWM信号时电感啸叫，接PWM信号后能正常调光，调到最大值时电感才没声音。我把R4拿掉就没声音了但是调光不行。

这是没接PWM信号3409第6脚的波形图，