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UCC5350: Gate drivers ICs

Spandana Siddula
Prodigy 30 points
Part Number: UCC5350
Other Parts Discussed in Thread: UCC5390, UCC21551

Tool/software:

We are supposed to use UCC5350 gate driver but we didn't find switching frequency for that part in datasheet. 

Can you please share me the details of UCC5350 operating frequency.

And suggest isolated gate drivers >5A current and switching frequency of 400KHz.

Thanks.

  • 0
    TI__Expert 3522 points

    Hi,

    Due to the holiday in the US on 27 May 2024, many of the device experts are currently out of the office. When they return, they will look into this and provide a response. Please expect some delay accordingly.

    Thanks,
    Pratik

  • 0
    TI__Genius 15126 points

    Hi Spandana,

    The UCC53X0 devices can switch up to 1MHz unloaded. When loaded, they have two limitations.

    First, the gate driver must have enough drive strength to charge and discharge the load capacitance within one period. A high output current rating will help avoid this limitation. 

    Second, the device has to stay below a 1W operating power dissipation and 150C Tj. You can estimate the power dissipation with the formula W= Qg * V *f,  or CV^2 * f, where Qg/C is the gate charge, and f is the switching frequency. If you use an external gate resistor, it will absorb a percentage of the power proportional to its resistor value and the gate driver's approximate output resistance.

    UCC5350 is a ~10A typical output current driver that can operate at 400kHz. UCC5390 has a larger output stage and is more robust. It can avoid the first limitation the best of this device family.

    For a faster unloaded output, you could try the UCC21551, which can switch almost up to 25MHz. However, it is more limited by the two above considerations with its ~4A output, and dual channel package. 

    Best regards,

    Sean

  • 0 in reply to Sean Cashin
    Prodigy 30 points

    Thanks Sean, 
    For your information, I have through data sheet of 5390 and check specifications, we missed one feature miller clamp function where as it is in UCC5350. 

    UCC5390 doesn't have Miller clamp. Can you please point me to any TI App note on "how to implement Miller clamp with another IC or discretely "?

    Thanks & Regards, 
    Spandana.

  • 0 in reply to Spandana Siddula
    TI__Genius 15126 points

    Hi Spandana,

    There is not a great way to add a discrete Miller clamp. You can get good Miller clamping with the UCC5390S if you use no external Rg and a tight Vgs turn-off loop length. Also, you can try adding some distance between the switch node and the low-side FET. This will add a small amount of parasitic inductance, which can help absorb some high dV/dt and reduce the Miller current injection.

    Best regards,

    Sean