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UCC28951-Q1: Check 24V / 10kW output system solution

Charles Jeon
Expert 2975 points
Part Number: UCC28951-Q1
Other Parts Discussed in Thread: UCC2895-Q1, UCC28950-Q1, UCC2895, UCC21520-Q1, UCC21710-Q1, UCC21530-Q1

Hi team

My customer wants to configure the system with the specifications below.

  1. Input voltage : 800V
  2. Output power : 24V / 10kW
  3. Frequency : 100kHz

In order to compose the above specifications, they are considering UCC2895-Q1, UCC28950-Q1 and UCC28951-Q1.

1. Is the system configuration of the above specification (input / output specification) possible with UCC2895-Q1, UCC28950-Q1 and UCC28951-Q1?

2. If it is possible, which of the three products is the most suitable?

Switching is controlled 100kHz by SiC.

3. Is it no problem to use a pulse transformer like the UCC2895 application circuit? Or should I use a dedicated SiC driver?

  • 0
    TI__Mastermind 25570 points

    Hello Charles

    The PSFB is a good choice of topology for this specification. I would recommend the UCC28951-Q1 as the best choice of controller for the following reasons -

    It offers a burst mode for use at light loads to reduce losses.

    It provides gate drive signals for the primary switches and also for the secondary side synchronous rectifiers. SRs will give a significant reduction in losses at 24V / 400A.

    It behaves better at wide duty cycles than the UCC28950-Q1 - see http://www.ti.com/lit/an/slua853/slua853.pdf

    The Gate drive signals from the UCC28951-Q1 are not strong enough to drive a MOSFET directly so a Gate Driver IC of some form is necessary. The application requires an isolation barrier between the UCC28951-Q1 controller and the SiC switches. It would be possible to use a non-isolated gate driver and have the isolation barrier in a gate drive transformer but there are a number of potential problems with this approach, including common mode noise currents coupled through the transformer primary / secondary parasitic capacitance. A simpler approach would be to use an isolated gate driver IC like the UCC21530-Q1 or UCC21710-Q1 or UCC21520-Q1.

    I did a quick search for isolated, automotive qualified SiC gate drivers - you can see the selection (5 parts) at http://www.ti.com/power-management/gate-drivers/isolated-gate-drivers/products.html#p1250=SiCFET&p1498=Automotive

    Please let me know if you need further information.

    Regards

    Colin