pwm driver interchangeability?

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  • tukidid
    Member
    • Jan 2011
    • 11
    #1

    pwm driver interchangeability?

    what to check when you want to put a different chip in same PSU?
    For example replace ob2269 with Sg6846 - the internal schematics look similar enough
    there is one diode and divider at FB input , but Zcs and Zfb differ too much between the two ?(12 and 5.5 kohm compared to 40 and 9 kohm so the component values in the rest of the PSU circuit need to be changed?)
    https://cdn.badcaps-static.com/pdfs/...2d6a23c015.pdf

    Ld755s is a better match when it comes to Zcs but it has a extra diode at FB input
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