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TPS7A3301EVM评估板测试问题

Other Parts Discussed in Thread: TPS7A33, TPS7A47

有一TPS7A3301EVM-061评估板,输入接明纬AC-DC开关电源测试,开关频率约625KHz,输出电压-16.02V,测得纹波噪声峰-峰值为65mV;接入评估板后,测得评估板输出-15.02V,纹波噪声峰-峰值为44mV;没有如TPS7A33数据手册所述将纹波噪声抑制下来,这为什么?