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UCC28C42这个系列的PWM芯片7脚电源正常情况下,8脚ref在什么情况下会没有输出?

Other Parts Discussed in Thread: UCC28C42, UCC38C42

UCC28C42这个系列的PWM芯片7脚电源正常情况下,8脚ref在什么情况下会没有输出?

或者有什么PWM芯片,功能类似UCC28系列,在COMP端电压低于1V时,Vref停止输出,可自恢复。