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PTD08A020W和PTD08D210W的纹波和温度

Other Parts Discussed in Thread: PTD08D210W, PTD08A020W

请教下,

使用电源模块PTD08A020W和PTD08D210W时,没有选用UCD模块,而是用CPLD倍频产生的200M时钟来进行产生3.3V的PWM波(频率为500KHz),INH和SRE引脚置高,电源模块PTD08A020W和PTD08D210W能产生需要的电压,但是没接负载时,电源模块就好烫,纹波可以达到400mV。

请问,这是什么原因?怎么解决这个问题?

谢谢!