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WEBENCH® Tools/UCC27714: UCC27714 working

Gandhali Joshi
Prodigy 250 points
Part Number: UCC27714
Other Parts Discussed in Thread: SN6501, UCC27712

Tool/software: WEBENCH® Design Tools

hello all,

PWM driving high side is 16KHz and attached herewith image for stanalone high side driver.

We are able to observe the waveform at HO without giving supply to the drain of IGBT.

When supply is given to drain UCC27714 gets damaged.

Please suggest some solution.

  • 0
    TI__Genius 13445 points

    Hello Gandhali,

    Thanks for reaching out.

    This will not work, unless you have dedicated floating bias on HB-HS as the bootstrap circuit is not compatible with your application given that the boot cap needs a path to GND to replenish when the high-side is OFF.

    I suggest you either use a dedicated high-side driver or have a dedicated floating supply to maintain HB-HS high given the high duty cycle operation i expect from your application.

    Regards,

    -Mamadou

  • 0 in reply to Mamadou Diallo
    Prodigy 250 points

    Hello Mamadou,

    Thanks for your suggestion.

    Could you please suggest me another standalone high side driver?

  • 0 in reply to Gandhali Joshi
    TI__Mastermind 23105 points

    Hello Gandhali,

    Thank you for the interest in TI high voltage drivers. The issue that Mamadou pointed out is one that exists for all stand alone high side floating drivers, depending on the application details.

    In your application, is there a MOSFET connected in the low side with the drain connected to the switch node, or HS pin of the driver? Or is your power train such that the switch node will be close to ground at startup, and will switch close to ground? As Mamadou mentioned, the boot capacitor for the high side bias is charged when the switch node, or driver HS pin switches close to ground.

    If this is a high side drive and the high side MOSFET source will not switch close to ground then an isolated bias for the HB to HS bias is needed. TI has a small cost effective solution for this which is the SN6501 and SN6505 transformer driver. It is specifically targeted for this function. Another TI high voltage driver to consider which is a smaller package and more cost effective than the UCC27714 is the UCC27712 which is in an 8 pin SOIC package.

    Confirm if this addresses your questions or you can post additional questions on this thread.

    Regards,