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TPS65131正电压输出异常

Other Parts Discussed in Thread: TPS65131

参考TPS65131 EVM搭的电路,+5V输入,+-15V输出,前两天还正常,突然昨天开始发现+15V输出减半(-15V正常),FBP电压也变成了0.6V(FBN正常1.2V),Vref正常1.2V。

于是开始逐个更换外围元件和TPS65131,情况还是没有改观。

今天继续调这个电路,直到现在半夜,还是没有结果,故发帖求教经验,谢谢~