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TPS54302空载基准电压和输出电压不正常

Other Parts Discussed in Thread: TPS54302

TPS54302按照TI官网推荐的设计,输出设计是1.2V,在电路空载时,反馈电压不是0.6V,而是会增大到0.8甚至1V以上,负载也随之增大;当负载接上1K电阻后,输出基准电压和负载电压正常,请高手帮忙解答是否正常?