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??????
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Hi
EN/SS脚功能上主要是芯片的软启动脚,所以是只能增加电容控制,而不能用电阻分压。带EN功能是因为可以将软启动SS电压拉低致使芯片shutdown, 所以也具备ON/OFF的控制功能。