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UCC27201: UCC27201DR For 100% Duty Problem

Cheney_Sun
Intellectual 595 points
Part Number: UCC27201
Other Parts Discussed in Thread: SN6501

 Hi TI EE：

               I want to use the mosfet driver UCC27201DR for Synchronous BUCK Converter.

               Vin:24V,Vout:10V~24V and Fsw:600KHz.The high side mosfet will operate by Duty 100%.Please help to make sure how to make sure the high side mosfet will operate by Duty 100%.

Thank you!

Best Regards

Cheney_Sun

  • 0
    TI__Mastermind 21160 points

    Hello Cheney,

    Thank you for the interest in the UCC27201 half bridge driver. For operation at 100% duty cycle of the high side MOSFET there will be a concern of maintaining the HB-HS high side bias voltage. The bootstrap capacitor is charged when the HS pin of the driver switches close to ground allowing the bootstrap capacitor to be charged from VDD thru the internal boot diode.

    For 100% duty cycle operation, there needs to be an isolated bias supply to provide the bias to HB-HS. The SN6501 is a simple solution to drive a small isolation transformer for this application. Information on this device can be found here:

    Let me know if you have any questions.

    Regards,

    Richard Herring