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我用ucc28019做AC-DC电源（24V-36v），完全按照手册上面的图和计算好的参数，可是当我把六脚钳位在4.8v，调四脚的电压从1.5到2.5v过程，占空比完全不变，什么情况？我钳位四脚在1.6v，调六脚也是 占空比不变，什么情况，
亲；你是如何钳的？建议给个完整原理和测试方法。
