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TPS54531 输出电压与负载关系

Other Parts Discussed in Thread: TPS54531

按照TPS54531典型电路,在面包板上搭建的,只有输出配置电阻做了改动R5=10k/1%, R6=2.2k/1%, 计算得出输出电压应为4.436V。

负载采用的是5Ω/5W的功率电阻,下图是测量结果:

从测量结果看到负载在5~20Ω输出电压会随负载变化,请问为什么会出现这种现象呢?跟输出电流有什么关系吗?我们的设设计需要提供4A电流。

电路原理图: