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关于TPS51116无输出问题

Other Parts Discussed in Thread: TPS51116

用TPS51116给DDR3供电,电路图如下图所示,D-CAP模式,实测无P1V5_DDR3输出,上电瞬间只在LL端测试到一个12V/100ns的高脉冲,求教如何解决?

PS:2pcs单板1pcs有输出,1pcs问题如上,换过IC和MOS问题依然存在,怀疑参数配置有问题导致过压保护。