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TPS 5430 PCB Layout Question

C Stotish
Prodigy 80 points
Other Parts Discussed in Thread: TPS5430

Hi,

 

I recently did a PCB layout for a TPS5430 to shift from 12-15V to 3.3V.  I was about to generate my gerber file when I noticed on page 10 of the data sheet for the TPS5430 and 5431 that the resistor divider network shows a dashed line running underneath the output filter capacitor, with a note stating "Route feedback trace under output filter capacitor or on other layer."  I was curious as to why this was put on this design layout.  The caps and resistors are in parallel, so circuit-wise this should not matter, but I thought maybe there was a reason to do that for this specific device, and wanted to make sure if it was critical for proper operation or not.  Let me know.  Thanks.

 

Chris

  • 0
    TI__Guru**** 191445 points

    Typically you will want to reference the top side of the resistor divider network to the point of load or output of the supply.  This will be on the "other side" of the output capacitor.  Since one side of the output capcitor is vout and the other side is ground, you will need to route that trace under the ouput capacitor if you are going to rout everythig on the top side.