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UCC27714EVM-551: Vbias points problem , adel and adelef no populated.

Furkan Eroglu
Prodigy 120 points
Part Number: UCC27714EVM-551
Other Parts Discussed in Thread: UCC27714, UCC28950, UCC27712

Hi team , I'm looking at the reference design of the UCC27714 EVM. But there are somethings that i did not understand.
there are 2 seperated Vbias supplies the first one of the vbias is the supply point for the ucc28950 controller and for the ISO724x IC. I think that these point are same , I'm not sure but  I'm a right? if this right  the ucc28950 is feeding from 12Volts  and the ISO724x is feed from max 5V amplitude how is this possible? 
and can i use UCC27712 half bridge gate drive instead of ucc27714.
and the other question is why a no pop connection is on the adelef and delef pin? 


thank you for helping me.


Furkan E






  • 0
    TI__Intellectual 2061 points

    Furkan, Thanks for your questions.

    There is a Vbias and Vbias2, I think the indication on page 9 of the userguide should be revised to match the silkscreen layer, which you can see clearly. They are different testpoints, one is referenced to GND and and another is referenced to PWRGND.

    In this scenario where COM and VSS are shorted, you may easily reference Fig44 and Fig 46 to convert the design to use UCC27712. We surely can help you review when you got it ready.

    Wish it helps.

    Thanks.

    Wei