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UCC28600: UCC28600 200W design

Toshiro Imi
Expert 7190 points
Part Number: UCC28600
Other Parts Discussed in Thread: UCC28056

Hello,

Our customer is planning to design 200W output power by using UCC28600+UCC28056. Although usual Flyback converter support up to approx.100W as far as I know, UCC28600 datasheet describes "Energy Efficient Power Supplies up to 200W". Would you let me know reason UCC28600 can support up to 200W design. Are there any restriction if a customer design such a high power by UCC28600.

Best regards,

  • +1
    TI__Mastermind 40350 points

    Hello Sir,

    Thank you for your interest in the UCC28600 QR-flyback controller.

    Compared to the other off-line flyback controllers, the UCC28600 has a stronger gate-drive output (0.75A source and 1A sink) which allows it to drive a larger MOSFET to handle the higher power. The other controllers cannot effectively drive such a large MOSFET directly and losses would be higher, unless a gate-drive buffer was used.

    There are no restriction for using UCC28600 at high power, but there are practical design considerations involving VDD capacitance and start-up time, etc.
    The most important consideration (I think) affecting the controller itself is to make sure that its maximum junction temperature is not exceeded under worst-case conditions.  The IC's power dissipation will depend on the IC bias current plus the maximum average gate-drive current for the MOSFET used.

    Regards,
    Ulrich