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关于TPS62130保护问题!

Other Parts Discussed in Thread: TPS62130

         最近用到TPS62130这颗芯片,测试的时候发现负载一短路IC就没输出了,坏的比例还挺高的,IC烧的时候也没发烫也没击穿的痕迹,

就好像哪里保护了一样,看手册是有短路保护的啊!还是我买的芯片有问题(假货)?下面是原理图