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TMS320F28027DA数字电源采样问题



用TMS320F28027DA 做的DC/DC升降压数字电源,总共用了3个ADC通道采样,其余两个正常,有一个是采输入电压的,空载采样时正常的,但是一带上负载采样值总是会比正常的低0.5到1.5V,但是用示波器看端口电压时正常的。不知道什么原因,请大家帮忙