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TPS54560: 24V转负15V,几乎不能带载启动

Part Number: TPS54560

用TPS5650做了一个正压转负压的电路,电路如图,空载时能正常输出-15V,正常输出-15V后再加的负载,或者让负载突然剧烈变化输出也没问题,起码0到1A这样的变化是没有问题的

但是先把负载加到输出端,然后再上电,负载最多加到200ma时就不能正常输出了,这个是为啥呀??哪里配置的不对吗