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TPS53355: TPS53355 输出电压异常

Part Number: TPS53355

使用TPS53355 电源设计,输入12V ,输出 0.9V ,原理设计如下,发现输出电压 高于0.9V ,0.96V ,调整Fsw频率  默认 500K ,输出电压降低到 0.94V,未达到设定电压输出,请问是什么原因