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TPS2561: Schematic Review

Prem Kumar
Prodigy 95 points
Part Number: TPS2561

Tool/software:

Hello,

Please review the following Schematic and suggest necessary changes required. 

VOUT1 and VOUT2 are powering separate SFP/QSFP connector. 
The Load Switch is used for powering SFPs and QSFPs. Is this part compatible to be used for the given application?


  • 0
    TI__Expert 3280 points

    Hi Prem,

    Here are two comments:

    1. Place a high-value electrolytic capacitor and a 100-nF bypass capacitor on the output pin is recommended when large transient currents are expected on the output.

    2. the lower SCH TPS2561 only shows 7 pins and misses GNDs.

    This device is not specialized for SFP/QSFP. But if the specs meet the requirements, it can be used.

    BR,

    Ke Wang

  • 0 in reply to Ke Wang
    Prodigy 40 points

    Hi Ke Wang,

    I work alongside Prem, and I have a few questions regarding the design:

    1. We currently have a 22uF, 10µF and 100nF capacitor near the SFP connector. Do you think this is sufficient, or would you recommend adding a separate 100nF capacitor near the TPS2561 output pin?

    2. Regarding the schematic, we follow a hierarchical design approach. The lower schematic serves as the top block for the TPS2561 (GND connections are not explicitly shown—it’s primarily representational).

    3. Could you please share the part number for the specialized power switch used for SFP/QSFP?

    Best regards,
    Gireesh

  • 0 in reply to Gireesh Nair P
    TI__Expert 3280 points

    Hi Gireesh,
    1. I think it's fine to have all caps on the SFP side. Having a cap near the output can be better but not mandatory.

    2. Thanks for the feedback.

    3. I'm not familiar with SFP - - I find TPS62441in this user guide: SFP Application Interface Card, please check if it helps.

    BR,

    Ke Wang