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UCC21710: Reh. the driver connection

Renan Santos Adriano
Mastermind 25405 points

Part Number: UCC21710

Hello Experts,

What are the key considerations to be taken care of when using UCC21710 for driving Sic, in termws of - HS driver, LS driver.

I have replicated the design from UCC reference guide (UCC217xx and ISO5x5x Half-Bridge EVM User's Guide for Wolfspeed 1200-V SiC : Page 22), I have two doubts:

(i) In HS driver, output at gate is connected to CLMP, whereas it is not in LS driver:  why is it required, and is it mandatory? can u explain please?

Screenshot 2025-12-19 110045.png

(ii) COM is not connected at two pins in HS driver, as indicated in diagram

Screenshot 2025-12-19 111826.png

whereas two points connection for LS driver. why so, and how critical it is if both connected v/s one connection?

Regards,

N S Ramanathan

 

  • 0
    TI__Expert 3297 points

    Hello Renan,

    The LS driver also the output connected to CLMP through the GATE_LS node. The CLMP prevents false turn-on caused by miller capacitance during fast switching. You can leave it floating or tie to the VEE if unused.

    Regarding your second question, that seems to be an error in the schematic. VDD_HS should also connected to a COM through a high value and low value decoupling caps like in VDD_LS. The purpose of the high value capacitor is to be a reservoir of charge to supply the instantaneous charge requirements of the circuits locally, so the charge doesn't need to go through the inductance of the power trace. The purpose of the low value capacitor is to short the high frequency noise away from the chip. 

    Best regards,

    Muiz