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LM2596空载&带载纹波测试



测试的电源是淘宝买的模块:LM2596S-ADJ DC-DC可调降压模块 电源模块 IN3-40V OUT1.5-35V/3A


Test Condition: 输入24V(来自明纬开关电源LRS-100-24), LM2596-ADJ输出调节到15V,空载

纹波测试结果:Vpp=62.5mV,如下图

Test Condition: 输入24V(来自明纬开关电源LRS-100-24), LM2596-ADJ输出调节到15V@0.3A,负载50R
纹波测试结果:Vpp=268mV,如下图
一些需要好好思考的现象
从上两张图的对比可以看出,这个Buck的输出电压,在空载的时候,有一段是平的。而当带载0.3A的时候,那一段平的却有了那么点斜率。