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  1. #1
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    Push Pull DC/DC converter design uisng UC3846

    hi,

    I want to design a isolated push-pull converter using UC3846 pwm controller. Specs are

    V(in) = 10-18VDC
    V(out) = 100VDC
    I(out) = 6 Amps

    I can implement non isolated version. I need help in the implementation of isolated voltage feedback loop using TL431 and opto-coupler.

    Regards

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  2. #2
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    Re: Push Pull DC/DC converter design uisng UC3846

    Hello, 600 watts out = 60ADC in, so the turns ratio needs to be at least 1:10 ( 10V to 100V ) more to allow for losses.

    push-pull is OK but the Tx needs to be low leakage L from pri to pri & pri's to sec ...

    there are loads of app notes showing how to use TL431 & opto to get a signal to the pri side

    the op-amp on the 3846 needs to be configured as a unity gain follower

    good luck ...


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  3. #3
    Full Member level 6
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    Re: Push Pull DC/DC converter design uisng UC3846

    I will be very thankful to you can provide some documents. I need some detailed theory regarding loop compensation etc.

    Regards



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