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UCC28810一些弱弱问题

以前没有接触过变频的控制IC,英语水平有限,看IC资料也不能看懂,问题如下:

当仅仅给IC供电后,IC启动了,我的GDRV(7脚)始终是高电平,以前看过的好像都是PWM波形!我看了IC内部时钟,感觉是这样!请用过的朋友指点一下!谢谢