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UCC28C56EVM-066: How to use Evaluation board

?? ???
Prodigy 20 points
Part Number: UCC28C56EVM-066
Other Parts Discussed in Thread: UCC28C56H-Q1, UCC28C53-Q1, UCC28C53

Tool/software:

ご協力いただきありがとうございます。
UCC28C56EVM-066の使い方について問い合わせたいのですが。

このボードに搭載されているPWMコントローラICはUCC28C56H-Q1ですが、このICをUCC28C53-Q1に変更すると正常に動作しますか?
ICを交換したところ、正常に動作しませんでした。
ICを変更する場合、他の部品も交換する必要がありますか?

よろしくお願いいたします。

(株)ニッキ
市形台

  • 0
    TI__Genius 15416 points

    Hi,

    As long as both devices are pin to pin compatible, yes you can use UCC28C53 on UCC28C56EVM-66. The only difference between both device is UVLO, which means that one will take shorter to start than the other.

    Thank you

  • 0 in reply to Manuel Alva Hernandez
    Prodigy 20 points

    Hi Manuel,

    Thank you for contacting us.
    I understood about the UVLO difference only.
    However, just changing the components did not work properly.
    When I mount UCC28C53-Q1 on UCC28C56EVM-066 board, do I need to increase the capacitance of C12 from 22uF?
    I believe that the formula in the datasheet below shows that different UVLO will change the capacitance of C12.

    (Page 31 of the UCC28C53-Q1 datasheet)

    Thank you in advance.

    Regards

    Ichikatai

    NIKKI CO.,LTD.

  • 0 in reply to ?? ???
    TI__Genius 15416 points

    Nikki, sorry for the delay on the response. Please, see my follow ups below.

    -When you mention it did not work properly, could you please elaborate more? What is wrong? It does not start up? Could you please provide waveforms of (VDD-GND), (DRV-GND), (CS-GND), (VS-GND) for a better debug?

    -Regarding Cvdd cap, you can keep the same value. With a different UVLO, the device will take longer (higher UVLO_ON) or shorter (lower UVLO_ON) to start up, but it will not affect the performance of the device.

    Thank you