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关于TPS65131空载输出正常,加负载异常问题



请各位专家帮忙看看,附件是原理图,3.7V输入,输出4.6V,-3.9V,空载时输出正常,加上负载后大于50MA,电压就被拉低,不知道驱动能力到底是多少,还是原理有问题?搞了好久没搞定,期盼专家的回复,非常感谢!