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TPS63060输出5V给H桥逆变电路供电问题

Other Parts Discussed in Thread: TPS63060

我现在想通过TPS63060输出5V左右的电压,输入电压为(4.3V-8V)。负载由于是给H桥逆变电路供电的,所以暂时在开关电源上看到是输入为6.6V时电流为440mA;现在的问题是空载的情况下一切正常。一旦加入上述的逆变的负载的时候当输入电压小于6.8V的时候电源芯片输出为4.3V。芯片暂时能工作。但是一旦输入电压大于6.8V,芯片就停止工作。有时候上电工作几秒后停止工作。这是为啥?