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Original question:

UCC2897A: 52V to 12V 180W isolated solution

UCC27517A: PMP9656

Zoe Ko
Expert 3550 points
Part Number: UCC27517A
Other Parts Discussed in Thread: UCC27511, PMP9656, , UCC27611, UCC27511A, PMP7451, PMP3162, PMP9720, UCC27517, UCC27614

Hi team,

For PMP9656, could we use the UCC27517A to replace the UCC27511?

We saw that UCC27517A is with inventory on TI.com but no inventory for the UCC27511/A.

Thanks! 

  • 0
    Genius 5360 points

    Hi Sir,

     How about UCCC27611? Will it has better LT than UCC27511 if customer want to MP on Q3 2022?

    Best regards,

    Gary Teng

  • 0
    TI__Expert 4070 points

    Hi Zoe,

    Thanks for reaching out!

    -------

    The UCC27517A is not pin-to-pin compatible with the UCC27511.  The UCC27611 is also not pin-to-pin compatible; additionally the UCC27611 has an internal LDO that limits the gate drive voltage to 5V (for GaN applications).

    -------

    I can reach out to you via email to figure out part sourcing for the UCC27511 or UCC27511A.  Unless you are willing to change your design to accommodate a different driver.  Please let me know!

    -------

    Thanks,

    Aaron

  • 0 in reply to Aaron Grgurich
    Prodigy 70 points

    Hi Aaron,

    Our previous design is reference PMP7451. New project need 12V 150~200W output solution.

    PMP3162 , PMP9720 and PMP9656  are all use UCC27511DBV gate driver.

    But the delivery date of UCC27511 is not good, do you have any other suggested part?

    Thanks,

    Elvis

  • 0 in reply to Elvis Liang
    TI__Expert 4070 points

    Hi Elvis,

    If we are willing to use a different part that is not pin-to-pin to the UCC27511, there are many options to chose from.  Again, this would require a small schematic and layout change.

    Please let me know if we are willing to use a different part or not (that is not pin-to-pin), thanks.

    -------

    Looking at our single-channel low-side drivers, the UCC27517 / 517A are a great choice.  Compared to the UCC27511, they do not have as much sink current capability if that is a concern.  (4A vs 8A)

    The new UCC27614 is our new single channel, low-side driver with 10A source and 10A sink capability.  As of this post, there are 3,000 DSG-package units available.

    --------

    I have also created an email thread with Zoe, so we can discuss with our team to figure out supply schedules.

    -------

    Thanks!

    Aaron Grgurich

  • 0 in reply to Aaron Grgurich
    Prodigy 70 points

    Hi Aaron,

    Thanks for your support!

    We can use a different part , this project still in pcb layout state.

    If the current of the UCC27517 is enough for our application, I think the UCC27517 will be better than the UCC27614 because the package is smaller.

    Can I use UCC27517 instead of UCC27511 in PMP9656?  How to calculate whether the current of the gate driver is sufficient?

    thanks,

    Elvis

  • 0 in reply to Elvis Liang
    TI__Expert 4070 points

    Hi Elvis,

    You are welcome!

    --------

    This is great news!  The team and I are working with Zoe now.  The UCC27614 actually has a slightly smaller package with the SON (DSG) package (2mm x 2mm), versus UCC27517 SOT-23 package (2.90mm × 1.60mm).  Additionally, the UCC27614 has higher drive strength than any of the other parts we have discussed (10A source and 10A sink).  So, if high drive strength is a concern, the UCC27614 is a great solution.

    The UCC27517's drive current is likely enough for your application, but it depends on how fast you want your MOSFETs to switch.  Switching times are hand-in-hand with power dissipation both in the gate driver and the power MOSFET.  Our document, the Fundamentals of Gate Drivers goes over switching times and power dissipation in section 2.7 "Power Losses".

    Having higher drive current can give more flexibility to you by simply changing gate resistor values to change the amount of current that can flow into the MOSFET gate.

    -------

    Zoe, the team, and I are working on supplying the UCC27614DSG at the moment, please let Zoe know if you want otherwise.

    -------

    Please let me know if this helps; otherwise feel free to follow up!

    Thanks,

    Aaron Grgurich