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Original question:

TPS92691EVM-001: Change to Buck topology.

TPS92691EVM-001: About modify points of TPS92691EVM-001 for buck converter mode.

Kazuya Nakai59
Guru 20785 points
Part Number: TPS92691EVM-001

Hello guys,

One of my customers bought TPS92691EVM-001 to evaluate the device for their next products.

They want to modify this EVM for buck mode only because the conditions of their next product are VIN=24V, VOUT(LED Vf)=6V and ILED=5A.
I made a document to explain the modify points of TPS92691EVM-001 for buck mode only.
I attached the document. 

Could you please take a look the document and give me your comment or advice?

Your reply would be much appreciated.

Best regards,
Kazuya.

TPS92691EVM-001_ModifyPointForBuckOnly.pdf

  • 0
    TI__Mastermind 18890 points

    Hello,

    Below is what it should be for the Buck with the exception of the feedback from Rcs should be reversed with CSP and CSN as corrected in red.  Your schematic is not fully configured that way...Thanks Tuan

  • 0 in reply to Tuan Tran74
    Guru 20785 points

    Hello Tuan,

    Thank you very much for your reply.

    I made the modify points document I sent you previous referring this Figure 27.

    Could you please tell me which point is not good for buck LED driver.

    Your reply would be much appreciated.

    Thank you again and best regards,
    Kazuya.

  • 0 in reply to Kazuya Nakai59
    TI__Mastermind 18890 points

    Hello,

    We do not recommend modifying the evaluation board to a Buck topology.  The added jumpers and wires in the high current and high switching path is not a good way to do this.  You will get into more issues trying to do this.

    Just initial look you have the output caps wrong, ground side needs to go to inductor output and most of it is wrong and convoluted for me to comment.

    Thanks Tuan