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Unexpected Current Consumption/Oscillation when TPS25910 connected to Keithley 2306 Charger Simulator in Charger Mode

Jhury Abuabara
Prodigy 60 points
Other Parts Discussed in Thread: TPS25910

We are working on a board that uses the TPS25910. As part of the setup we are connecting the board to a Keithley 2306 Battery/Charger Simulator. The “supply” and sense lines of the Keithley are only connected to the TPS25910: IN, GND, EN (Pull-up to IN via 10K resistor) pins on the board.

 

We have encountered a behavior that we have not been able to root cause. When the board (not powered, or connected to anything) is connected to the Keithley 2306 in charger mode, we have a current drain ranging from 65mA to 200mA and what seems to be an oscillation. This does not occur when using the 2306 in battery mode or standard power supplies (not battery/charger simulator).

 

We wanted to find out if the TPS25910 may react differently when a “charger” is connected to the input pins than when a battery is. Is there anything on this setup that may be causing the behavior described?

  • 0
    TI__Intellectual 2800 points
    Hi Jhury,

    Sorry for the delay in my response. I was on vacation last week.

    The TPS25910 behaviour should not charge whether charger or battery connected at the input. It might be due to V/I characteristic of the charger mode in Keithley 2306. 65mA to 200mA is too high current when the device is unpowered.

    Can you please use an oscilloscope to plot IN to GND voltage waveform. It can give some information for debug.

    Regards,
    Venkat