UCC28250 4脚 ILIM 逐周期限流脚,规格书电压是超过0.5V就会关闭驱动,测试发现经常达到0.7V 都还没有关闭 如图黄色是 4脚波形,蓝色是驱动 ,紫色是输入的电压倍拉畸变了,绿色是输出电感的的电流波形
This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
HI
超过0.5V会关掉驱动输出,直到下个周期重新开始,除非再超过0.5V,否证正常输出。
HI
一个周期就是几个uS, 延时不应该也是几个uS.
将电路放上来看看?从你上面波形看是电流限制导致的duty关闭,你可以将sense电阻调小再看看结果?