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LM5008A: 启动瞬间烧掉前端的抗浪涌电阻,但是5008就不会

Part Number: LM5008A
Other Parts Discussed in Thread: LM5008

如图所示,输入的PACK+和PACK-为80V电压,转为12V输出,12V转5V,然后给200mA的显示屏供电,发现在上电瞬间,会偶尔出现输入处1R电阻烧掉的情况

1. 最初样板用的是LM5008这个芯片,只做了2片,没有出现过烧掉1R电阻的情况,后面买芯片的时候买成LM5008A了

2. 并不是每次都会出现,而且是在拔插连接器的瞬间偶尔出现的