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UCC21750: Can UCC21750 Be Used for Driving CoolMOS™︎ Super-Junction MOSFETs?

nikilesh Wanjari
Prodigy 10 points
Part Number: UCC21750
Other Parts Discussed in Thread: UCC23525, UCC5350, UCC21330, UCC21550

Tool/software:

Hello TI team,

I’m currently using CoolMOS MOSFETs (e.g., IPW60R041P6) in a single-phase, 230 V RMS inverter design. These devices have a high gate charge (~250nC), and I’m exploring gate driver options.

I've been looking at the UCC21750, which is primarily marketed for SiC and IGBT applications with up to ±10 A drive strength.

  • My understanding is that CoolMOS devices do not require DESAT protection and typically don’t need a negative gate bias.

  • However, UCC21750 offers features like active Miller clamp, reinforced isolation, and isolated analog sensing, which seem beneficial.

My key questions are:

  1. Can UCC21750 safely and effectively drive CoolMOSTm MOSFETs without using DESAT protection or negative bias?

  2. Are there any functional limitations or design caveats (e.g., reliability, switching performance, gate overshoot)?

  3. Would TI recommend using the driver in this application, or are there specific caveats or recommended settings (e.g., UVLO, Miller clamp usage)?

Looking for real-world guidance or similar use cases, if available—thanks in advance!

  • 0
    TI__Prodigy 170 points

    Hi there,

    First, I would try and narrow down your system requirements. For example, does your system/circuit absolutely need reinforce isolation, isolated analog sensing, or over current detection. DESAT offers overcurrent detection and prevents damage. However, DESAT is known to cause some issues and can be hard to debug. 

    To answer your key questions: 

    1. Yes, UCC21750 can drive the CoolMOS MOSFET without DESAT protection, but other issues may arise. 

    2. Yes, there are false faults that are known on the nFLT and DESAT pins. DESAT issues tend to be a nuisance for operation of the nFLT pin. 250nC is not too much charge for the driver to supply. Typically, Roh is a key limiting metric for drive strength 

    3. If your system doesn't need additional protection features like isolated analog sensing or DESAT. A non-protection driver will also work for your needs. 

    Below all are different types of isolated gate drivers:

    Single Simple Channel (have Miller clamp and UVLO)  --> UCC5350 (option for Miller clamp or Split Outputs), UCC23525 (5A source and 5A sink peak output current and 5kVRMS reinforced isolation rating), there are other parts listed on the TI website 

    Simple Dual Channel -->  UCC21330 (Disable, High CMTI, Programmable dead time, Functional safety capable, UVLO, no miller clamp), UCC21550 (similar) 

    Protection --> UCC21750 (Isolated analog sensing, DESAT, UVLO, miller clamp, 10A drive current)

    Hope this helps narrow down your options,

    Siara Patel