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TPS54620: Vsense lead length

Wally Phillips23
Prodigy 10 points
Part Number: TPS54620

We have a design where it's better for us to put the TPS54620 on a daughter board, where the load (FPGA) is on the mother board. One approach is to use a bunch of pins on the connector between the boards to mitigate voltage drops. The other approach is to run the Vsense lead down the connector to the FPGA and use fewer pins on the connector. One engineer doesn't think that will work. How long can we run the pins between the Vsense pin to the load? Are there any considerations for the compensation network from the load to the Vsense pin?

Thanks.

  • 0
    TI__Guru**** 191445 points

    Wally,

    I generally do not recommend it, but I have successfully routed VSENSE as far as 4 inches from the device.  I do not recall if it was specifically TPS54620, but it was a similar device at least.  You will want to be extremely careful with the routing to avoid any noise pick up.  You will also need to ensure minimal ground differential between the converter and the point of load.  For 6 A load current you will still want to use multiple power and ground pin connections.  With adequate pins and copper pour, you should see minimal drop.  You will need to compensate for any impedance inside the loop including any capacitance at the point of load.  In my application at least, it worked well.  Can you tell me more about your application?  How far away is your FPGA?