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LM21215A问题

Other Parts Discussed in Thread: LM21215A, UC3907

使用LM21215A芯片5V输入,1V/15A输出,问题是5颗芯片同样FB电阻时,输出电压均不一样,有大于1.2V和小于0.9V的情况。之后我又发现所有网络均有一个500KHz的噪声,包括GND、SWITCH和Vin,尝试过更换电感但没有作用。请问这个可能产生的原因,以及可行的办法。