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TPS54540 空载时输出问题

Other Parts Discussed in Thread: TPS54540

TPS54540 空载输出电压有轻微波动 一高一低的 幅度只有零点几V而已  请问这是不是这芯片的空载自动跳频的原因? 带小负载的话就输出就很稳定