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UCC28061-Q1: phase shift in case of various input voltage

Hirotaka Matsumoto
Guru 27555 points
Part Number: UCC28061-Q1
Other Parts Discussed in Thread: UCC28063, UCC28061

Hi all

Would you mind if we ask UCC28061-Q1?

On our customer's circuit, it tends to increase the difference of phase shift(between GDA and GDB) in case of various input voltage.
Especially, we think the value over 210 degree is ubnormal.
Is our recognition correct?

<Phase shift in case of various input voltage>
85V：183゜
132V：191゜
169V：209゜
240V：266゜
264V：264゜

We heard that our customer changed the board layout, after that, it occurred these ubnormal value.

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Mastermind 34465 points
    Hello Matsumoto san,
    Is this is the same question that you asked in this post:
    e2e.ti.com/.../631475
    Are you saying that these results occurred when the board layout changed ?
    Were the acceptable before the pcb layout changed?

    One other question:
    Why are they using the UCC28061 generic part instead of the newer UCC28063 generic part ?
    Do they need automotive qualification?

    Regards
    John
  • 0 in reply to John Griffin1
    Guru 27555 points

    John san

    Thank you for your support always!

    Are you saying that these results occurred when the board layout changed?
    ->Yes, the customer changed the board layout, as the result, it occurs.
    Were the acceptable before the pcb layout changed?
    ->Yes, before the board layout, there was no trouble.

    Why are they using the UCC28061 generic part instead of the newer UCC28063 generic part ?
    Do they need automotive qualification?
    ->They have to use automotive qualification.

    And then, as the result, is 264 degree ubnormal value, right? 

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to John Griffin1
    Guru 27555 points

    John san

    Our customer could confirm that the problem cause of the layout.
    TSET, ZCDA and ZCDB are very close.

    So, at the present, our customer will change the layout.

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    TI__Mastermind 34465 points
    Hello Matsumoto san,
    Thank you for providing this information.
    We know that the resistor on TSET needs to go directly to ground. Noise can get injected into TSET and cause erratic behavior of the system.
    Regards
    John