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TPS22968: Asking for the TPS22968 design layout review

Part Number: TPS22968

Hi Sir,

 

My customer would like design TPS22968.

Would you please review schematic and layout and provide your comment?

Design material

 

 

Password: ti

 

BR,

SHH

  • Hi SHH,

    I am unable to open the BRD file to look at the layout. Is it possible for you to take a screen shot of the layout or if possible, put it into a PDF?

    Secondly, I took a look at your schematic. I would recommend only using one CT capacitor and connecting CT1 and CT2 to it. This will half the turn on time so the capacitor value needs to be doubled. Please refer to Section 10.1.1 on the datasheet for more information.

    I also want to confirm the polarity of the EN signals of POWER_STB and VAD_EN. I see that the pins are pulled high and I was wondering if these signals were floating and pulling to GND.

  • Hi Shreyas,

    would you please install the PADS free viewer for this review? it will reduce the time for you.

    txn.box.com/.../ux6jvebpfm2fcesqkna1bqazvtytn0x4

    Thanks for feedback and help!

    BR,

    SHH

  • Hi SHH,

    Unfortunately, I have tried using PADS in the past and it does not seem to work on my system.

    Please send a pdf/picture or an altium compliant format of the layout. Also please confirm the use of a single CT cap and the control signals of this system.

  • Hi Shreyas,

    Wotps22968.pptx

    Would you please refer to the capture here in the ppt and provide comment for suggstions?

    BR,

    SHH

  • Hi SHH,

    Please refer to the questions about the control signal polarity and the use of a single CT capacitor.

    I took a look at the layouts and I have a few more comments:

    1. The VIN and VOUT bypass caps look close to the power path. This is acceptable.

    2. You can use only one CT cap to save space and place it as close as possible to the device. The distance they are at now is acceptable.

    3. I noticed that in U705 thermal vias are used and in U706, there is a GND plane under the device. Both are acceptable but if possible the GND plane is better to dissipate heat faster. If possible, please use a similar layout in U705.

    Let me know if you have further questions.