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。
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用三极管做的开关电路去控制芯片的Vcc吗,让芯片欠压,Vref不输出?