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UCC21520: PWM for UCC21520

Raymond Cao
Prodigy 40 points
Part Number: UCC21520
Other Parts Discussed in Thread: TINA-TI, TPS40055, TPS40057, TPS40061

Hello Texas Instrument Forum, 

I am using TINA-TI to simulate my DC/DC Synchronous Buck Converter from 500V down to 200V. The purpose is to use SiC MOSFETs, and my choice of isolated gate driver is UCC21520. This specific gate driver

uses a digital PWM controller. However, I am looking for an analogue PWM chip to use for my simulation. So far, I have found TPS40061, TPS40055, and TPS40057. Do you have any suggestions on which PWM

chip I should use? Would the trouble of simulating an analog PWM for this circuit provide any insight as to how a digital micro-controller would affect the results? The image below shows our design using the function

generators on TINA. 

Thank you.

  • 0
    TI__Guru**** 189399 points

    Hi, Raymond,

    Thanks for your question.

    The UCC21520 is a gate driver. It’s functionality is to take a PWM signal at a logic level and scale it up to drive high-voltage MOSFETs. It doesn’t care whether the PWM comes from an MCU or an analog controller.

    I honestly don’t understand what you’re asking.

    If you want advice about PWM generation IC’s, I suggest you start a new post and reference those part numbers.   The group that supports those products can give you some tips on them.

  • 0 in reply to Don Dapkus
    Prodigy 40 points

    Hello Don,

    To clarify my question, we are trying to simulate a real PWM with the UCC21520. Could you recommend an analog PWM with design files that could control a UCC21520 Gate Driver that is implementing a synchronous DC/DC buck converter. The parameters are VIN = 500V, Vout = 200V, and Iout = 10A.  

    Thanks for your time

  • 0 in reply to Raymond Cao
    TI__Mastermind 30600 points

    hello Raymond,

    Please use the parametric search on ti.com to find possible devices that meet your specifications.