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UCC28740: 芯片启动时 Drv引脚只打一个PWM波

Part Number: UCC28740

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