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TPS62152电源输出

Other Parts Discussed in Thread: TPS62152

最近用TPS62152做了一个4.1转3.3V的稳压电源,但是第一次测量的时候为3.1V,接上负载后变为了1,7V。后来重新焊接后,却变为了4.05V.怎么也稳不到3.3V。测量了一下PG引脚没有被拉高。是什么原因。电路和数据手册中的电路是一样的。