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TPS23753A空载输出为12V,带负载后电流只有200mA,电压降到5.6V,TPS23753A发热严重

Other Parts Discussed in Thread: TPS23753A

TPS23753A空载输出为12V,带负载后电流只有200mA,电压降到5.6V,TPS23753A发热严重,电路是按照推荐的12V1A的demo电路图做的,调整过反馈的参数,没有任何改善。请帮忙分析下,谢谢!3833.POE.pdf

  • Hi
    芯片发烫,先用示波器确认芯片是否有有哪个功能脚过压,如果没有在确认驱动,注意MOS的选择(Qg尽量小)。
    输出偏低,有可能是变压器设计问题,测试一下是否有过载保护的情况。