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tps54821的问题

Other Parts Discussed in Thread: TPS54821

在使用TPS54821时,发现在输出5V时用电子负载抽3A电流可以稳定工作,但是将输出电压改成9V,电子负载抽1A的电流,输出就被保护了,请问能帮我分析一下原因吗?