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LM3421调试问题

项目规格:输入21-30V,输出54V/0.82A,输入电容470UF,输出电容二个470UF/63V并联,工作频率520K

1,开始调试时,输出振荡利害,后来在COMP端由电容接地改为RC(R=200R,C=224)串联接地后好了很多。但24V工作时输出电流波动大,会升高到0.9A,其它输入电压能稳在0.82A.

2,输出不能短路,容易烧检流电阻。

以上问题有什么好的办法解决?请指教。