【经验】SGMICRO降压芯片SGM61020P轻载纹波偏大解决方案
圣邦微电子（SGMICRO）SGM61020P是一颗5V高效率BUCK电源芯片，适合POL电源应用，给核电压提供稳定输出，PG脚可用于电源时序控制。笔者在测试圣邦微SGM60102P评估板（图1）时，发现其纹波异常，本文将分析并给出解决方案。
测试问题：
在Vin=5V，Vout=1.5V，Iout=0.27A条件下，SGM61020P的纹波偏大，峰峰值在43mV左右，波形图见图2：
图2
问题分析及解决：
1、 笔者在测试输出电流为1A，0.5A时，纹波都在30mV以内，在输出电流为0.27A时，用示波器点SW波形发现，此时DCDC已经工作在PSM模式下，此模式下具有高效率优点，但是相应的纹波性能会差些；
2、 在输出端再增加电容22μF，纹波并未有所改善，由于评估板上前馈电容C7未加电容，此电容可提高环路响应速度和稳定性，经验值一般在20pf~220pf，C7改为22pf后，输出纹波有明显的下降，峰峰值26mV，波形见图3。
图3
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CH
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Vcc (Min)(V)
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Enable
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I_OUT(mA)
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Package
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Frequency (kHz)
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SHDN Iq(μA)
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Vcc (Max)(V)
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SGM6010
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DC/DC Synchronous Rectifier Buck Converters
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1
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3
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L
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0.41
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3000
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TDFN-3×3-10L
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300 to 2000
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2
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5.5
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型号- 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