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  1. butterworth

    No V ir I sensing in lamp driver

    Dear All, In the following App Note... http://www.st.com/stonline/products/literature/an/5656.htm ....a schematic is given for an electronic lamp ballast using switch mode PFC and PWM stages. I am wondering why the PWM stage (which supplies the lamp) has no output voltage feedback sensing...
  2. butterworth

    Differential versus common-mode SMPS EMC filter

    I notice in the book "power supply cookbook" by Marty Brown that he concludes every smps design example with the design of a second order common mode EMC filter. He states that if this isnt sufficient a differential filter stage should be added to make it 3rd order. I would have thought that...

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