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TPS73233 5V输入无法输出3.3V,直接输出5V,或者是1.2V,求救!!!



设计一个仪器,有地板想控制板供电,5V输入给TPS73233,1脚和3脚接输入,2脚接地,4脚悬空,5脚输出,但是无法输出3.3V,买了十片都测试过了,要么输入等于输出,要么值就不对,是在不知道是那部分电路出现问题能产生这样的结果,求教了!!!!!