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UCC27210d HO和LO引脚没有波形产生,芯片不工作

Other Parts Discussed in Thread: UCC27210

各位工程师,我在做一个BUCK拓扑的时候用到了UCC27210d ,给buck.pdf芯片供电12V,并给HI和LI输入互补的PWM波形时,HO和LO脚一点波形也没有,感到非常的奇怪,更换过一次芯片却没有用。想请工程师们看一看,那里出了问题。