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关于LM5118芯片低电压输出端不正常的现象



各位好,请教一个问题,如下图电路在调试中发现,当输入端在6-8V时,电路会短路状态,稳压源保护,当输入端在8V以上时,输出电压正常,电流也正常;负载是40欧姆;请帮忙分析下有可能是什么原因造成的?