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  • UCC21521: UCC21521 drives SiC MOSFET highly ineffective

    TI Thinks Resolved
    Part Number: UCC21521 Tool/software: Dear TI, I have built a prototype PCB where I wanted to have SiC MOSFET in half-bridge architecture. I used TI dual gate driver with SiC but I got into an issue with high ineffective switching. I would say it is down…

  • UCC21521: Primary-Side logic failure meaning

    TI Thinks Resolved
    Part Number: UCC21521 Tool/software: Hi team, I have a customer with the below question on the UCC21521. Let me know what you think and thanks in advance! "I had a question about a UCC21521 Isolated Gate driver. In the datasheet, on the first page it…
    • Answered

  • UCC21521: dual gate driver SiC slow switching

    Resolved
    Part Number: UCC21521 Tool/software: Dear TI design support, I experience the slow intermittent switching in half-bridge and dual gate driver UCC21521, I used negative stage bias with Zener diods for my SiC MOSFETs and wonder why the gate signals are…
    • Resolved

  • UCC21521: PSFB converter design using UCC21521 + UCC28950

    TI Thinks Resolved
    Part Number: UCC21521 Other Parts Discussed in Thread: UCC28950 , , UCC21551 , UCC21520 , UCC21530 Tool/software: Hello, For one of our customer we are designing power converter module using PSFB topology. Control IC we are considering as of now is UCC28950…

  • UCC21521: TINA simulation Convergence problem with transient analysis

    TI Thinks Resolved
    Part Number: UCC21521 Other Parts Discussed in Thread: UCC21551 Tool/software: Hello , I have downloaded a PSPICE transient model of UCC21521 from the TI website and ran a transient simulation. However, the simulation fails to converge. In transient…
    • Answered

  • RE: UCC21521: gate driver getting failed during start-up condition

    Resolved
    Hi sean, Thanks for your advise. We tried TVS diode SMBJ15A-E3/52 (Stand off Voltage 15V) across Mosfet driver UCC21521 power supply voltage (VDD15V) to clamp the transient voltage that goes beyond 25V. As expected, TVS diode clamps fast transients if…
    • Answered

  • UCC21521: UVLO destroys the first pulses of a short tone burst on the Bootstrap capacitor on the high side output

    Resolved
    Part Number: UCC21521 Other Parts Discussed in Thread: PMP23223 I am trying to use a pair of UCC21521 as a full bridge high voltage pulser. During the beginning of the short 5 cycle tone burst the UVLO activates on the High Side Output and does not permit…
    • Resolved

  • UCC21521: Ringing/oscillation on MOSFET gate

    TI Thinks Resolved
    Part Number: UCC21521 Hi, we are facing same problems discussed in the following thread about gate ringing oscillations: https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/895653/drv8305-ringing-oscillation-on-mosfet-g…

  • UCC21521: UCC21521

    Part Number: UCC21521 Hi, I am trying to simulate PSpice model of UCC21521 with MOSFET ( NVHL027N65S3F ) Hex bridge and flyback diodes(IDW80C65D1) parallel with it . We want to estimate the current through the flyback diode. The motor's coil resistance…

  • UCC21521: Can NC pin connect to GND?

    TI Thinks Resolved
    Part Number: UCC21521 Hi Team, When I look at D/S, NC pin has no connection with internal circuit. So, that mean customer can connect NC to GND? or left open is recommended? Regards, Kotaro Yamashita

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