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TPS40400输出电压不正确



大家好,我用的DCDC芯片是TPS40400RHL,12伏输入,1伏输出,具体原理图如下所示:

结果测试时发现输出仅为0.7V,其中FB引脚电压仅为400mv(手册默认值为600mv),请大家帮忙分析下到底是什么原因呢,小弟不胜感激!