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TPS55288: Current sinking and current limit

alan gomez
Prodigy 70 points
Part Number: TPS55288
Other Parts Discussed in Thread: TIDA-050017

Hello,

What is the max current TPS55288 can sink?

Also, what is the behavior of the current limit feature when TPS55288 is sinking current since (VISP - VISN) would in theory be negative? i.e. can this device limit current in both sourcing and sinking modes?

Thanks!

Alan

  • 0
    TI__Mastermind 27620 points

    Hi Alan,

    Thanks for reaching out.

    May I know what is the application here?

    For TPS55288, the negative inductor current limit is about 2A.

    Since VISP-VISN is negative when TPS55288 is sinking current, the current limit function will not work.

    BRs,

    Bryce

  • 0 in reply to Bryce Xun
    Prodigy 70 points

    Thanks for the information.

    Application is basically a TEC driver similar to the design outlined in TIDA-050017 (but with more power output).

    I want to connect a TEC/peltier element across input and output for bidirectional driving. I also wanted to take it a step further and use the current limit feature to implement constant current control.

    Alan

  • +1 in reply to alan gomez
    TI__Mastermind 27620 points

    Hi Alan,

    Thanks for feedback.

    As I replied before, TPS55288 can only implement constant current control in sourcing mode. Maybe you can use an external current sensing method to do the constant current control.

    BRs,

    Bryce