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UCC29950 LED项目相关问题

Other Parts Discussed in Thread: UCC29950, PMP11237

TI的专家,

你们好

我司LED电源用的方案是Ti UCC29950,开机无任何反应,主要帮看一下原理图是否有问题,具体问题如下:

1、IC第12(FB)脚一直持续VCC的一个高电平,按datasheet要求FB电压应该是高了,是否是这个原因导致IC关闭;

2、IC第7(MD_SEL/PS_ON)脚如我的原理图直接接VCC是否可以?

3、过温保护和过压保护也是接FB脚实现吗?