• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 196 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.

TPS62743EVM-689: Input short upon disable

Jejomar Ildefonso
Expert 8700 points
Part Number: TPS62743EVM-689
Other Parts Discussed in Thread: TPS62743,

Hi Team,

Our customer is currently evaluating the TPS62743 through its EVM. Input stage is a Li-polymer battery with short circuit protection. Output voltage is configured 3V as per JP3,JP4 and JP5. However upon disabling the device through JP1 the battery protection circuit trips. They've tried other li-polymer battery manufacturers but encountered the same results. The datasheet does not provide further information about the output discharge of the device.

Is this a normal behavior of the TPS62743 pulling the device to ground (EN low) causing the input short? Or is there a possibility there is an issue with the TPS62743EVM-689 used by our customer?

Thanks in advance!


Kind Regards,

Jejomar

  • 0
    TI__Expert 3611 points

    Hi Jejomar,

    This is not a normal behavior of the device. How exactly are they pulling the EN pin low? By changing the position of JP1 by hand? If this is the case, when removing the jumper from ON they are actually causing EN to be floating for a while before putting the jumper back on OFF. As the datasheet for the TPS62743 suggests on page 10, the EN pin must be terminated at all times for safe operation of the IC. Also what could happen is that when moving the jumper, the pin could go between LOW and HIGH intermittently and this will cause the IC to go into start-up which could cause the higher input current.

    Regards,

    Davor