• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 29 subscribers
  • Views 475 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

EK-TM4C129 Target VBUS Power Fault detection

Victor L-S
Intellectual 925 points
Other Parts Discussed in Thread: TPS2052B, TPS2052

Hello Amit,

My design calls for powering a target using OUT2 of the TPS2052B regulator. The target, a damaged memory card, could 1. draw too much current or 2. be shorted to ground.

I'm attempting to use PQ4 in interrupt mode to indicate either of these conditions thereby disabling (EN2) the regulator. 

Is enabling the regulator then shorting X11-60 to ground an appropriate test. Currently it appears to be resetting the EK board.

Thank you,

Victor

  • 0
    TI__Guru**** 244380 points
    Hello Victor

    When an overcurrent condition occurs, the TPS2052 is supposed to limit the current. However if the current input is less than the output current at which the condition occurs, then it would cause the loading of the LDO, hence a reset as the LDO voltage drops.

    I would not consider this as a valid test. What you need to do is to provide sufficient input current to the switch so that the overcurrent condition can be detected before the input voltage droops.
  • 0 in reply to Amit Ashara
    Intellectual 925 points
    Hello Amit,

    I supplied 5V 3.5A to the debug port and repeated the TARGET_VBUS (X11-60) to GND test. The LDO held OUT1 (no board reset) and faulted on OUT2 generating a detectable OC2 low.

    All is good.

    As a side note...the *EN for this part is enable high.

    Thank you,

    Victor
  • 0 in reply to Victor L-S
    TI__Guru**** 244380 points
    Hello Victor,

    Yes. Looking at the datasheet for TPS2052B the EN pins are Active High to turn ON the power.