麻烦请问 什么情况下 ucc28740在启动时 Drv引脚只打出一个PWM波?目前启动时 芯片只打一个PWM波后便停发波了。
PSR and SSR Flyback Aux Winding OVP and UVLO Fault Sensing Design tips and Troubleshooting 的参考设计中 好像指出ucc28740 启动时 最少打3个PWM波进行故障检测
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