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EMI performance of LMZ10501/LMZ10500 Simple Switcher

Posted: 17 Feb 2012     Print Version  Bookmark and Share

Keywords:power conversion  DC-DC  radiated EMI 

In this application note, National Semiconductor discusses the LMZ10501 and LMZ10500 Simple Switcher nano modules DC-DC solutions designed for space-constrained applications. The LMZ10501 is capable of driving up to 1A load with power conversion efficiency, line and load regulation. The LMZ10500 is a 650mA version module pin-to-pin compatible with the LMZ10501. The LMZ10501 and LMZ10500 nano modules is touted to offer excellent EMI performance. The evaluation board with the default components complies with the CISPR 22 Class B radiated emissions standard. Adding two small 0.1µF 0805 input capacitors results in CISPR 25 Class 5 radiated emissions standard compliance. The addition of a small LC filter (1µH and 1µF) to the input of the default evaluation board results in compliance with CISPR 22 Class B conducted emissions and allows for even larger margin of compliance in terms of radiated EMI.

View the PDF document for more information.

Originally published by National Semiconductor at as "LMZ10501 and LMZ10500 SIMPLE SWITCHER Nano Module EMI Performance".

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