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为什么TPS5430效率只有56%?

Other Parts Discussed in Thread: TPS5430, TPS62175, TPS62177

大家好,我现在在做一个产品,24V转5V然后给后级负载供电,用的TPS5430,输入端测试数据:26.35V  22.6mA,输出端数据:5V  65.5mA,效率只有54.9%。测试点及电路图参考附件,能不能 帮忙解决一下,效率到85左右就可以!