This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM5026: LM5026有源钳位正激变换器带载能力差

Part Number: LM5026


技术团队,你好,

      最近采用贵司LM5026有源钳位控制器实现Vin:9~40V,OUT:5V/4A,变压器参数为3Ts:4Ts,互感器采样负载电阻是3.9Ω,100:1互感器,出现以下以下异常工作状态:12V输入,0.5A/5V负载时,工作状态正常,CS互感器电流采样波形及开关管漏极波形如下图所示:

    

但是负载电流增加至0.6A,会出现电流采样波形下降沿局部抖动的异常情况,漏极波形变变差,具体波形如下图所示:

     

当负载电流增加至0.7A,上述异常现象变得更加严重,如下图所示:

    

请问出现上述负载增加,工作状态特性变差的可能原因在哪?有何优化措施?谢谢!