Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

  • State Resolved
  • Locked Locked
  • Replies 5 replies
  • Subscribers 65 subscribers
  • Views 928 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

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.

UCC23513: UCC23513 , input NMOS selection

user5962098
Prodigy 140 points
Part Number: UCC23513

Hello,

I use the UC23513 driver to drive a power mosfet.

Considering the application schema in the datasheet (figure below), can you recommend me an NMOS M1 that would be suitable ?

Thank you in advance,

Maxime

  • 0
    TI__Guru**** 189399 points

    Hi, Maxime,

    Thanks for your question. There is nothing particular about that mosfet, you just need one that can support the voltage you are running at, and the current will be limited by the resistors. The most important factors are: what gate voltage can your system supply, and don’t forget to incorporate the rDS(on) of the FET in your calculation of resistor values to achieve the 7 mA recommended level for our gate driver.

    Something like PMZ550UNEYL could be used for this FET.

    If this answered your question, please press the green button, otherwise, let us know if you have further questions.

  • 0 in reply to Don Dapkus
    Prodigy 140 points

    Thank you very much!

    One more question regarding the choice of output diodes for , in series with the resistors RGon and RGoff.

    Which parameters should I pay attention to?

    Peak reverse voltage (>Vcc) and max. overvoltage current (>4.5A/5.3A)?

    Thanks again.

  • 0 in reply to user5962098
    TI__Guru**** 189399 points

    Hi, Maxime,

    Check out this tech note that discusses gate resistors:

    http://www.ti.com/lit/an/slla385/slla385.pdf

  • 0 in reply to Don Dapkus
    Prodigy 140 points

    Thank you for your answer. But I was talking about the diodes, not the input resistors.

  • 0 in reply to user5962098
    TI__Genius 10652 points

    user5962098 said:

    One more question regarding the choice of output diodes for , in series with the resistors RGon and RGoff.

    Which parameters should I pay attention to?

    Peak reverse voltage (>Vcc) and max. overvoltage current (>4.5A/5.3A)?

    Hi Maxime,

    Schottky diodes would be the best option for your design because of the need to have a low forward voltage and no reverse recovery charge.

    If your design is using 33V which is the maximum supported for UCC23513, you should choose a diode with at least 35V Peak Repetitive Reverse Voltage (V_rr/V_rwm) at least, otherwise choose the spec based on your Vcc + some headroom.

    When checking the peak current spec, please note that the datasheet may specify Pk Average Current (I_o) as well as a Repetitive Working max current (I_frm).
    I_frm is going to be higher than I_o and is likely closer to operation it will see with a gate driver, so you could select based on I_frm if its available in the datasheet. You can spec it against the advertised peak source/sink currents (4.5/5.3A) like you mentioned or calculate the spec you need based on your usage in the design.

    The forward voltage of the diode should be as small as possible (while still meeting the V_rwm and I_frm specifications). Otherwise, extra power will be unnecessarily consumed when switching and you will not be able to charge the gate as completely due to the diode voltage drop.

    Please let us know if you have more questions.

    Best,

    Dimitri James