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tps56121 en/ss 问题

Other Parts Discussed in Thread: TPS56121

tps56121 焊接后,en/ss 接33n电容,输出正常(1.1v 1.0v都正常),用电平(电阻分压,试了多种值)控制en/ss,发现没有输出,难道56121的en/ss不能直接电平控制吗? 必须像datasheet 一样加个mos管配合软启动电容使用??????