• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 3 answers
  • Subscribers 63 subscribers
  • Views 447 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

750Vdc controller 5Aout

Antonio Faggio
Expert 8000 points
Other Parts Discussed in Thread: UCC2895, UCC27710, LM5117

Hi

I need to make a DC-DC converter with 400 to 750 Vdc input and 540 Vdc 5 A output, which controller do you recommend?

Thank you,

A

  • 0
    TI__Mastermind 33115 points

    Antpnio,

    Thanks for connecting through E2E. Here is the list of available phase-shifted full-bridge controllers from TI. UCC2895 has no SR control but would be well suited for this application. Newer versions of UCC2895 include light load efficiency and SR control. The requirements are very high voltage on the input side (750 V), less than 2:1 VIN range so the duty cycle should be healthy. I was thinking if you keep the frequency low enough (~20 kHz), IGBTs can be used on the bridge or SiC on the primary is the frequency needs to go higher than ~20 kHz. The secondary is also high voltage and 5A should not require SR. High voltage rectifiers suffer from Qrr…we know this from CCM PFC. HV SiC diodes are excellent in hard switched applications and have no Qrr so they are good for CCM switching. 540 V on the output….650 V SiC diodes would be close and might work because there should be almost no ringing but still leaves very little margin. 1.2 kV SiC diodes are also available and now you have plenty of margin. 

    Regards,

    Steve M

  • 0 in reply to Steven Mappus1
    TI__Expert 8000 points

    Hi Steve,

    Thank you, customer specs changed a little bit.

    Need a buck to step down 310Vdc to 130Vdc 15Aout.

    No need for a phase shift as customer wants to reduce components as much as possible.

    The buck is even ok to have Vin 12-24V and then it should drive a gate driver like UCC27710 which then drives high voltage mosfet 650V 48A.

    Do we have an AppNote to do this? For example LM5117 could be a good fit since it also has the FB pin.

    Please let me know,

    Thank you,

    Antonio

  • 0 in reply to Antonio Faggio
    TI__Mastermind 33115 points

    Antonio,

    Since the requirements are changing, I am going to refer your inquiry to an expert from our High Power Drivers (HPD) team. Someone from HPD will be connecting with you by EOD Friday.

    Regards,

    Steve

  • 0 in reply to Steven Mappus1
    TI__Expert 8000 points

    Hi All, did anyone have chance to look at above request? I am not sure it deals with HPD as stated in the specs though. Thanks,

    Antonio

  • 0 in reply to Antonio Faggio
    TI__Mastermind 33115 points

    Hi Antonio,

    I am going to close this E2E thread and ask that you start a new thread so it will get appropriately assigned to right support team. My apologies and thanks for connecting through E2E - we need to improve Reponses where no specific part number is mentioned in the thread title or original post.

    Regards,

    Steve M