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TPS5430: 输入24V,输出负压(-15V),会偶现电压无输出!!

Part Number: TPS5430
Other Parts Discussed in Thread: LM22676

请问,使用TPS5430,输入电源24V,输出-15V,实际电流只有几百mA,但在实际应用中,会偶现电压无输出,是否是因为24-(-15)=39V,超出最大输入36V限制???导致芯片工作异常。如果是这个问题,有没有其他替代料?谢谢!