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LM3481做反激电路,反馈电路无法控制不起作用。

Other Parts Discussed in Thread: LM3481

LM3481用作反激电路的控制芯片,输入5v,输出4.5V到6V变化,在没有反馈电路的作用下,用示波器测FB脚电压稳定在1.275V,驱动波形刚开始最大占空比输入,等输出电压稳定到5V时,驱动波形只有三分之一占空比。现在不加反馈电路,加了反馈电路和不加反馈电路的情况一致,并且基准的变化无法改变输出电压波形。请问芯片哪里出来问题?