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TPS40057输出电压随输入电压增大而变小

Other Parts Discussed in Thread: TPS40057

我有按照TPS40057的设计参考设计了一款电源,当输入电压为12v的时候输出5.2v符合我的设计。当电压升到20v的时候输出变为5v。当输入电压为25v的时候,输出电压变为4.9左右。请教为什么。负载和空载效果一样。