• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 1079 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.

Need high side drive. To 100% duty. Negative going.

Andrew Massey
Prodigy 120 points
Other Parts Discussed in Thread: ISO7810, ISO7710, UCC23513, ISO6720, UCC28C43

Hi,

Do you have a hi side drive chip for the attached kind of thing. It would be done with ti.com chipsSurge Buck_DigiIsolator_230113.zip

  • 0
    Prodigy 120 points

    Could the digital isolator in the above use the ISO7710 or ISO7810?

  • 0
    TI__Guru**** 189401 points

    Hi, Andrew,

    I would suggest one of our isolated gate drivers and you'll need an isolated supply to drive it to be able to achieve 100% duty cycle.

    My colleague recently released a reference design along these lines:

    https://www.ti.com/tool/PMP23223

    This is meant for applications that require "smart" drivers. You can replace the UCC217XX Smart driver in this design with something like UCC23513.

    Let me know what you think of this proposal.

    Best regards,

    Don

  • 0 in reply to Don Dapkus
    Prodigy 120 points

    Hi,

    I have developed the Surge Buck Converter further now, as in the attached.

    Please do you have ti.com part numbers to do the hi side fet drives for the Surge Buck? (i was thinking a common digital isolator with 100V/ns to refer the gate drive signal up to the hi side...as before, the gate drive needs to go to 100%)

    I wonder if the UCC23513 may fall nil-stocked?...there doesnt look to be much stock of it anywhere.....i was thinking a cheap jelly bean digital isolator with 100v/ns and a cheap gate driver.

    ....Eg what about an ISO6720 digital isolator to refer the gate drive signal to the hi side...and then a UC27517 gate driver in the hi side?

    (The LT1243's would be changed for UCC28C43's)

    The surge Buck allows the 300W SMPS  with Normal vin of 10-36vdc, to still operate through a 175vdc surge for 500ms.

    LTspice sim and jpeg attached.

    Surge Buck_300w_2NFET.zip

  • 0 in reply to Andrew Massey
    TI__Guru**** 189401 points

    Hi, Andrew,

    Sorry, I can't open your LTSpice files - they won't let us download it for some reason!!!!!!!!

    Supply is improving, UCC23513 should be fine. We have parts on our website you can buy.

    Either way, you will need some sort of floating power supply if you need to go to 100% duty cycle.

    Best regards,

    Don