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请教ucc28710用做DC-DC控制器

Other Parts Discussed in Thread: UCC28710, UCC28910, LM5017

请教一下我把ucc28710用做DC-DC控制器怎么不工作呢?

我是想做一个24V转1000V1mA的电源,使用原理图如附件。

现在的现象是加电后,DRV管脚始终是0.