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TPS92201AEVM: 最小电流问题

Part Number: TPS92201AEVM

您好,我在测试TPS92201EVM评估板的时候发现,输出占空比为1%的PWM,未连接任何LED和外部负载的情况下,实际输出电流最低只能到50mA,请问这是怎么回事?