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UCC5320: Vcc2 limit for UCC53x0 Single-Channel Isolated Gate Drivers

Thierry zimmermann
Prodigy 20 points
Part Number: UCC5320

Hello,

I have to use a isolated driver to drive MOSFET quickly.

Data sheet page 27 § 10.3 say : 

For operation with unipolar supply, the VCC2 supply is connected to 15 V with respect to VEE2 for IGBTs, and 20 V for SiC MOSFETs.

The VEE2 supply is connected to 0 V.

In this use case, the UCC53x0 device with Miller clamping function (UCC53x0M) can be used.

I don't use Miller clamp fonction.

I want to know if i can use the IC with unipolar VCC2 15V for driving Mosfet ? 

Is 20V VCC2 mandatory only in the case with Miller clamp fonction ?

Thanks for help

Thierry Zimmermann

  • 0
    TI__Intellectual 2805 points
    Hello Thierry,

    Welcome to e2e and thank you for your interest in our single-channel isolated gate drivers.

    The paragraph from 10.3.1 that you are referring to suggests recommended driving voltages for IGBTs and MOSFETs with a unipolar supply and the devices with the MIller clamp, UCC5310M and UCC5350M.

    To answer your question, the UCC53x0 family supports unipolar VCC2 operation up to 33V.

    The 20V VCC2 is not mandatory use case for the miller clamp function. 20V is recommended for unipolar driving voltage for SiC MOSFETs . Please refer to the MOSFET or IGBT datasheet for an optimized drive voltage.

    For more information on our miller clamp function, please refer to section 10.3.4.4 of the datasheet.

    If this answered your question please press the green resolved button.

    regards,
    Mateo
  • 0 in reply to Mateo Begue
    Prodigy 20 points

    Hello Mateo,

    Thanks for your answer.

    If i understood , the VCC2 voltage could be 15V .

    The Vcc2 voltage be compatible with the Mosfet VGSth parameters.

    Best regards

    Thierry

  • 0 in reply to Thierry zimmermann
    TI__Intellectual 2805 points

    Hello Thierry, 

    Yes, your understanding is correct. 

    Regards,
    Mateo