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TPS54620使用问题咨询

Other Parts Discussed in Thread: TPS54620

你好,在用TPS54620实现5V转3.3V的时候遇到了一个问题,就是在不加负载的时候输出3.3V正常没问题,在加上负载后输出电压被拉低到2.91V这样,同样的电路在另一块板子上输出的3.3V是正常的,请问这是为什么呢?