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TPS23750非隔离输出一直重启

Other Parts Discussed in Thread: TPS23750

您好,用TPS23750做的PD没有加负载,总是重启,一直重复检测、分级、启动;去掉D4以后输出就正常了,但加负载后不能正常工作,输出电压变成48V 。

请教:

1、什么原因导致重启?

2、什么原因Q2被击穿了?

谢谢!