最近用UCC28634方案调试一款AC380转20V1.2A原边反馈反激电源,调试过程中发现,上电后空载电压不稳,同时不能带载。查看第6脚Vdd波形,最高点15.2V,最低点5V,反复振动,以为是供电OVP保护,调整Rb大小无反应。请有经验的大神帮忙支招。谢谢!
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最近用UCC28634方案调试一款AC380转20V1.2A原边反馈反激电源,调试过程中发现,上电后空载电压不稳,同时不能带载。查看第6脚Vdd波形,最高点15.2V,最低点5V,反复振动,以为是供电OVP保护,调整Rb大小无反应。请有经验的大神帮忙支招。谢谢!