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非同步BUCK电路,上管自举电容充电问题?

关于非同步BUCK电路,因为下管是二极管,那么上管的自举电容是怎样充电的呢?充电路径是怎样的呢?希望TI的工程师帮忙解答下,谢谢!是通过负载的回路进行充电的吗?还是芯片内部有上管自举电容充电的回路呢?