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TPS23754过流保护的问题

Other Parts Discussed in Thread: TPS23754

SCHEMATIC1 PAGE1 TPS23754.pdf

请问下TPS23754过流的问题,AT标准的现在带到20W是没问题的,现在有遇到过出现输出12V直接短路时,TPS23754没保护,变压器后端的二极管烧坏(短路很长时间才会造成烧二极管)。请问下TPS23754为什么没启动过流保护机制呢?谢谢