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UCC23513: Issue regarding the

Revathi Rayapati
Prodigy 20 points
Part Number: UCC23513
Other Parts Discussed in Thread: UCC5350, , UCC23525

SA_TelBMS_Current_Limit_Sheet.pdf

Dear TI Team,

Please find the attached schematic and give conform on below points with priority:

  • whether the application circuit for driver IC (UCC23513BDWYR ) is correct to drive particularly low side MOSFET Gate.
  • Here PWM signal is coming from 3.3V Microcontroller, hence is UCC23513BDWYR is compatible with 3.3V Logic.

Regards,

R. Revathi.

  • 0
    TI__Genius 17136 points

    Hi Revathi,

    These opto-emulator part will have better noise immunity if you put all the resistance on the anode; that is, the top resistor should be 260 and the bottom should be 0 ohms.

    It looks like there are two input options: +3.3V_uC and PWM_From_3.3VMCU. Either one will work. 3.3V is sufficient, so long as you can supply 10mA at ~2.1V into the input.

    The MDE1991 has 7.3nF of Ciss. UCC23513 will be able to drive it with "good enough" switching losses at low frequency, But you may benefit from a stronger driver if you need >15kHz continuous switching. Then I recommend using UCC5350 instead, which is a driver with 10A of output current. The switching losses should be ~20% lower.

    Best regards,

    Sean

  • 0 in reply to Sean Cashin
    Prodigy 20 points

    Hi Sean Cashin,

    Thank you for your reply.

    As per the schematic +3.3V_uC and PWM_From_3.3VMCU are not input options. here PWM_From_3.3VMCU is the PWM signal(70Khz) coming from 3.3V microcontroller is only the input signal. But +3.3V_uC(optional) is like supply to Anode(pin1).  Here I am giving two supply options for Anode (5 V (use case) and 3.3V(Optional, Don't consider this)).

    And we require switching frequency from 50K to 75Khz. In this case as you suggested UCC23525 is suitable or not.

    Also will you please share or assist on application circuit for UCC23525 to drive low side Gate. And consider this as higher priority.

    Regards,

    R. Revathi.

  • 0 in reply to Revathi Rayapati
    TI__Expert 3906 points

    Hi Revathi,

    Chiming in here for Sean, as he is currently out of office.

    Thanks for clarifying the schematic supply options.

    For the other device, information will be released publicly in March of this year so we cannot comment on this yet.

    If you have further questions regarding UCC23513, please feel free to ask!

    Regards,

    Hiroki

  • 0 in reply to Revathi Rayapati
    TI__Genius 17136 points

    Hi Revathi,

    I don't doubt the functionality of your input circuit. Your uC can probably drive the gate driver's input outright, but there is a benefit to Common Mode transient immunity if you use this buffer. It probably won't hurt since your switches are quite large. 

    50kHz to 75kHz is pretty fast, and your FET's switching losses will probably be significant enough to be of thermal concern. You can reduce the switching losses about 25% with a UCC5350, which has a stronger output stage. However, the UCC23525 is a lower cost option, and still a ~6% improvement vs the UCC23513. 

    Either device is suitable, I just want to help you make an informed tradeoff between efficiency and cost. 

    Best regards,

    Sean