各位专家好,在使用LM5088MH-2时碰到一个问题,就是在驱动关断时,SW脚对地电压周期性地有尖峰。蓝色是SW波形,黄色是驱动波形。请帮忙分析下,谢谢。
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您好,
请参考这个帖子内讨论的内容。
LM5088: Abnormal waveform - Power management forum - Power management - TI E2E support forums
看起来变流器在CCM和DCM之间的边界条件下工作。
在DCM中,电感器电流与功率MOSFET/功率二极管的寄生电容共振,这会导致SW节点处的电压摆动。