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UCC29950: UCC29950 Controller IC

Bharat Chauhan
Intellectual 510 points
Part Number: UCC29950
Other Parts Discussed in Thread: UCC28070, UCC28951, UCC25600, UCC28180

Can i use UCC29950 Controller IC Up to 2.5Kw Charger Development???? 

Is it Help full to me in development or Develop charger with separate PFC and LLC Section is better.

Can you please tell me limitation in terms high power development using this Controller???  

  • 0
    TI__Mastermind 25570 points

    Hello Bharat

    At 2.5kW you are probably better off using an interleaved PFC stage (UCC28070) and a separate full bridge LLC controlled by a UCC25600. You may want to consider using a Phase Shifted Full Bridge for the DC/DC stage (UCC28951) - especially if the input/output voltage conversion ratio will change significantly or if the output voltage is low (12V) where the ripple current in the output capacitors of the LLC can be significant.

    In either case, the UCC29950 is probably not the best choice - it was primarily designed for lower power applications.

    Regards
    Colin

  • 0 in reply to Colin Gillmor
    Intellectual 510 points

    Hello Sir,

    If i use gate driver circuit on Output of this controller then up to which rating i can use this controller successfully.

    Output Voltage of PFC Stage - 450V

    Output Voltage of LLC Stage - 100V

    I want to develop battery charger for Low power and High power. Voltage configuration in both application will be same.

    Guidance require on,

    1) for this voltage configuration up to which rating UCC29950 is suitable

    2) UCC29950 common supply use for IC , I think it is not fulfill requirement of isolation between LLC and PFC Stage. 

    Regards,

    Bharat

  • 0 in reply to Bharat Chauhan
    TI__Mastermind 25570 points

    Hello Bharat

    As I said earlier, the UCC29950 is not well suited to applications above about 750W or so. There are a couple of reasons for this.

    An interleaved PFC stage is a better option at high power because each stage handles only part of the power. You also get the benefit of some ripple cancellation in the input and output capacitors. This will reduce self heating especially in the output capacitor and improve product lifespan.

    At full bridge solution is a better option at higher power levels - this applies to either LLC or PSFB topologies - because of better transformer core utilisation.

    Battery chargers require the power stage to operate over a wide range of output voltages - the LLC operates most efficiently when it is running at resonance but this implies that the input/output voltage ratio is constant. The PSFB does not have this issue and will run efficiently over a wide range of output voltages.

    I'd suggest you look at the UCC28070 interleaved PFC and the UCC28951 PSFB controllers. You might want to look at the UCC28180 single channel PFC controller for comparison purposes - this device has been used at over 5kW in some applications (despite my comments about interleaved PFC stages above).

    Regards
    Colin