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TPS5430: TPS5430做电压转换的时候,模块里的二极管选取有什么要求呢?

Part Number: TPS5430

如图所示,按下图原理图接好电路后,发现电路运行一段时间后,输出电压降到了-7V,将电路中的二极管跟换后(换成了不同型号的二极管),电压正常了,请问这是什么原因?