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ucd9222电源问题

Other Parts Discussed in Thread: TMS320C6678, UCD9222, UCD7242

大家好

我采用ucd9222+ucd7242的方法给tms320c6678供电,原理图完全参照6678参考板设计。

我用fusion digital power这个软件控制ucd9222,采用参考板给的工程,现在的问题是,用原工程无电压输出,两路pwm都为799k。而将rail2的pwm频率改为300k后,两路都可以输出,rail1,电源质量很好,rail2有很大的文波。请问rail2的pwm频率为799k不能正常工作的原因是什么?