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UCC28950电压模式调节时,为什么只调节半个周期?

Other Parts Discussed in Thread: UCC28950

刚用UCC28950做电源控制芯片,现在补偿网络配置可能有问题,变压器初级线圈电压波形如下

感觉只调节了半个周期,请问,问题出在哪里呢?