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UCC5350: Maximum Frequency of UCC5350MC

Nandish Jasani
Prodigy 40 points
Part Number: UCC5350
Other Parts Discussed in Thread: UCC5390

Tool/software:

Hi,

   I have SiC MOSFET based design and my switching frequency will be 400KHz. I want to use UCC5350MC SiC MOSFET driving IC.

   Is this IC will work with 400KHz?

   What will be quiescent current of VCC1 and VCC2?

Regards,

Nandish Jasani.

  • +1
    TI__Mastermind 23106 points

    Hi Nandish,

    For UCC5350, the maximum unloaded switching frequency is around 10MHz. Technically, the max loaded frequency is determined by the output current and the output load. The UCC5350 has 10A of output current. If it is driving a 100nC load, its rise time will be about 10ns. 

    It is not really this simple, since usually you want the FET's voltage to dampen rise all the way up to the BUS rail conduct some current. 

    With 400kHz, what is the expected minimum duty cycle? A 5% duty cycle will be125ns. The switching time will vary depending on your FET selection and current, but you should still have usable pulse width at this frequency and assumed minimum duty cycle. Please see some example switching times below for UCC5350 and various FETs and currents: The turn-off times are about 1/2 these turn-on times, but that doesn't eat into your usable pulse width.

    Best regards,

    Sean

    UCC5350 driving 30A SCT3080KR in <30ns

    UCC5350 driving 2A IMZ120R350M1Hin <20ns

    UCC5350 driving 60A 3 parallel NTH4L015N065SC1 in <50ns

     

  • 0 in reply to Sean Cashin
    Prodigy 40 points

    Thank you Sean Cashin for your reply. I got you point. However i used this IC in Resonance Inverter where there will be fixed duty cycle to 50% and varying frequency from 200KHz to 400KHz. I also used chopper (Buck Converter) in the same project and i will vary duty cycle from 10% to 90%. 

  • 0 in reply to Nandish Jasani
    TI__Mastermind 23106 points

    Hi Nandish,

    In that case you should have no problem! However, the UCC5390 has 2x the output current as the UCC5350. You can use that device instead if you are concerned about rise time. I have measurements for that device also, and it is indeed a little faster, although not by 2x.

    UCC5390 driving 30A SCT3080KR in <30ns

    UCC5390 driving 2A IMZ120R350M1Hin <20ns

    UCC5390 driving 60A 3 parallel NTH4L015N065SC1 in <50ns