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TPS56121电源输出1V给DSP芯片C6678问题

Other Parts Discussed in Thread: TPS56121

根据TPS56121推荐电路设计电源电路,输入5V,输出1V;当把负载C6678接上时,电源输出0V,当把负载断开时,电源输出1V;可以确定负载电路没问题(通过单板从其他电源飞1V进负载C6678,C6678工作正常),目前定位是TPS56121电路出问题,请教有什么办法可以把TPS56121这个电路调试出来,满足单板的设计要求,谢谢。