采用UCC28950作为移相全桥控制器,并配置为SLAVE模式。SYNC_IN频率为40000Hz时,4路PWM信号正常;当SYNC_IN频率降低到20000Hz以下时,驱动脉冲异常。

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Hi
UCC28950之类芯片一般频率建议设计到50kHz以上,低至20kHz一般是外部SYNC输入来做,而不是芯片CT/RT来做。
在低频率20kHz时,CT/RT控制出现的频率会出现不稳定。