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UC2844的BOOT拓扑 大功率cv问题

  设计Vin(21v-24v)输出250v(1.25a)

    以下是电路图,先测试结果VDS  下降沿有抖动很厉害,且输出电压没有到200v。

 

工作频率在250k ,且电流反馈波形很糟糕,用示波器探c8的波形尖峰比直接探mos的s极要高,还请大家都讨论讨论。周一我抓下波。给贴出来。