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开关电源输出电压与负载的关系

Other Parts Discussed in Thread: TPS54231

用TPS54231做了一块5V转3.3V的电源板,发现在电源空载时3.3V输出电压一直在跳变,电源板接上负载时输出3.3V电压就稳定了?开关电源输出电压和负载有关系么?