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UCC28951: PSFB charger

Tom Rouelle
Prodigy 30 points
Part Number: UCC28951

Tool/software:

Hi TI expert,

I'm designing a PSFB charger and I would like to use burst-mode for light load operation at the beginning and at the end of the charge to maintain a constant voltage.

Is it a good way to use this topology (burst mode as the default mode) ?

Do you know the duration of switching phase and off phase in burst-mode with the UCC ?

THX

  • 0
    TI__Guru* 86286 points

    Hello,

    Your inquiry is under review and I will get back to you shortly.

    Regards,

  • 0 in reply to Mike O'
    TI__Guru* 86286 points

    Hello,

    When the voltage amplifier demands a duty cycle that less than what is programed by Rtmin Output A through F will stop switching and it will not start again until the voltage amplifier demands a duty cycle > greater than what what is programed by Rtmin.

    Dmin = tmin*(switching frequency)

    Under no load conditions when the feedback has determined the output voltage is above regulation and at point where you are at Dmin or below the converter will enter burst mode and stop switching.  It will not start again until voltage amplifier demands a duty cycle greater than Dmin.

    The majority of converters will enter burst mode under no load conditions by default. So this should work in your design.

    Thank you for interest in Texas Instruments (TI) products.  If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

    Regards,