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LM53603: Switcher Input Voltage range on Eval Board

rich soennichsen
Prodigy 60 points
Part Number: LM53603
Other Parts Discussed in Thread: TPS2549

Hi,

We are working with the TPS2549Q1EVM eval board (USB Charge Port).  The design uses the LM53603AQPWPRQ1 Switching power supply.  The schematic indicates an input voltage range of 7V-18V.  That switcher has an input range of 3.5V-36V.

Our application needs the wider range, why is the TPS2549 eval board design limited to 18V?

Thank you

Rich

  • 0
    TI__Mastermind 25590 points
    Rich,

    We design EVMs to optimize for typical operation with popular specs. You can typically run the EVM's VIN as high as the part specs as long as you make sure to replace any components which may break at these voltage such as input capacitors. The LM53603Q1EVM has input caps rated up to 50V so you should be fine to turn it up to 36V. You may have to adjust the output caps or inductor for stability but it should be alright without modifications.

    -Sam
  • 0 in reply to Samuel Jaffe
    Prodigy 60 points

    Thank you for the help.  Another question, the "LOOP" signal is part of the voltage divider network on the switcher output and it is not connected to anything but a testpoint.  If this is for test only how would you suggest the design be modified to eliminate it?

    Thanks

    Rich

     

  • 0 in reply to rich soennichsen
    TI__Mastermind 25590 points
    Rich,

    You can remove the 49.9 ohm resistor (replace with a short) and remove the test point. Nothing else needs to be changed.

    For further questions please start a new thread. Threads lock after a certain period of time and I wouldn't want it to lock before I had a chance to answer. This also makes it easier to search for questions and answers in the future. Thanks!

    -Sam