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Original question:

CSD19534Q5A: Power loss calculation

CSD19534Q5A: Missing parameters for Nonsync Boost Power Loss tool

Pedro Mietto
Prodigy 95 points
Part Number: CSD19534Q5A
Other Parts Discussed in Thread: NONSYNC-BOOST-FET-LOSS-CALC, , LM5156H

Hi,

You have this very useful tool that help us calculate MOSFET power loss on a boost design, namely NONSYNC-BOOST-FET-LOSS-CALC.

However, there are many FETs missing in that tool, such as the CSD19534Q5A.

Do you have an updated version of that tool that includes all part numbers?

Or could you provide means to unprotect the sheet so I can manually type in the parameters from datasheet values (most of them, anyway)?

Best regards.

  • 0
    TI__Mastermind 29525 points

    Hi Pedro,

    Thanks for your feedback. The CSD19534Q5A is included in the boost tool. It may not be showing up in the pull down list because of your conditions. Please note, that all of TI's 80V and 100V discrete FETs require a minimum VGS = 6V. If your gate drive voltage is not high enough, then none of the 80V or 100V devices will be included in the drop down. The tool also filters out parts for VDS based on the output voltage. The minimum BVDSS must be at least 1.2 x VOUT. What are your input voltage, output voltage and gate drive voltage?

  • 0 in reply to John Wallace1
    Prodigy 95 points

    Hi John,

    Thanks for you reply.

    Indeed due to some input parameters, the larger FETs were being filtered out.

    BTW, gate voltage is 7V, as we're building a boost regulator with LM5156H. However, I find it odd that the Webench tool is not suggesting NexFET so I'm manually placing it into the design and going through the details.

    Best regards.