在UCC25640X手册中,对UCC256404启动电压描述的是VCC>VCC_startself时芯片启动;而在后文启动时序图中,标注的是VCC>VCC_startswitching;是哪个有误?
另外在实测中发现,高压启动时VCC引脚只能充电至10~11V左右,这是否正常?
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您好
您能否遵循应用手册末尾提供的上电指南并确定触发了哪个故障。
UCC25640x LLC Resonant Controller Features Brief Overview and Bring up Guideline
我对原理图也有一些建议:
1.添加与 D9串联的约2.2欧姆启动电阻器
2.将 FB 引脚电容降至1nF
3.将 BW 引脚电容增加到1nF
4.将 CE5电容增加至120uF