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    Power limitation using ic power integration topswitch

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    hi every body,

    So i find this circuit (flyback power supply 24 V 1 A) which use the ic top255yn from top-switch HX and the transformer MYRRA 74030 so i would to change it with the ic top245yn from top-switch GX,i know for that i need to change R3,R4 and R5 (R6 and R7 i know how to change them) so how i can calculate the values of R3,R4 and R5 to get the same features (Vout,Iout,Pmax).

    Cordially.

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    Re: Power limitation using ic power integration topswitch

    either read the datasheet , do ctrl F search, or do a design in PI Expert from Power integrations.
    If you post the datasheet link i will help you search.



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  3. #3
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    Re: Power limitation using ic power integration topswitch

    Hi,

    thank you verry much for your replay ,i know how to use PI Expert from Power integrations but this version dont supprt topswitch gx it supports only HX and Jx

    there are the links of topswitch gx and topswitch hx

    https://ac-dc.power.com/products/pro...e/topswitch-gx

    https://ac-dc.power.com/products/top.../topswitch-hx/

    Cordially.



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  4. #4
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    Re: Power limitation using ic power integration topswitch

    Suggest you upgrade the bridge rectifiers to 1N4007. With 265V AC at the input they only have 50V PIV rating overhead and could easily be damaged by relatively small transients on the AC.

    Brian.
    PLEASE - no friends requests or private emails, I simply don't have time to reply to them all.
    It's better to share your questions and answers on Edaboard so we can all benefit from each others experiences.



  5. #5
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    Re: Power limitation using ic power integration topswitch

    thanks for your note, but i think its ok because the reverse voltage of 1N4006 is 800 V



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