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LM5025A: 输出建立过程,comp脚电压出现回落,导致驱动异常

Part Number: LM5025A

LM5025A做有源钳位设计

在输入电压为48V,输出8.3A时,原边驱动出现间歇性发波现象。此时SS引脚电压建立正常,但COMP引脚电压出现振荡并回落至1V左右,初步判断为COMP脚电压不稳定导致输出间歇发波。设计中已尝试将COMP脚通过上拉电阻连接至REF,但驱动波形无明显改善。调试过程中,将CS1和CS2引脚分别下拉至地,也未对启机过程带来改善。

Ch2为comp脚波形,Ch4为输出波形

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