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TPS25944A: Overcurrent behaviour of TPS25944A

Prodigy 80 points

Replies: 12

Views: 262

Part Number: TPS25944A

Hello

I'm using the TPS25944A as a power management device. I specifically chose the version TPS25944A to use the overcurrent shutdown mode. In the datasheet the following statement is noted:

" The TPS25942 limits current to the programmed I(LIM) level. TPS25944 does not limit current but runs the fault timer when I(LOAD) > I(LIM)." (SLVSCE9D –JUNE 2014–REVISED OCTOBER 2017, page 8, note (3))

In my application, I set I(LIM) to 1.1A. When I reduce the load resistance (potentiometer) to create overcurrent,  the load-current will be limited to I(LIM) and the device does not shut off after 4ms.

Is there a further configuration to be done to use the overcurrent shutdown mode of this device?

Thanks in advance!

Adrian

  • Hi Adrian,

    Thanks for reaching out!

    Can you increase the load further and check. Please share me the schematic and test waveform.

    BR, Rakesh

    --------------------------------------------------------------------------------------------------------

    To find the latest information on Power Switches, Visit www.ti.com/powerswitch 

  • In reply to Rakesh:

    Hi Rakesh

    Thanks for the fast reply!

    I constantly increased I_Load using a potentiometer.

    After reaching 1.1A , I_Load remained steady.

    After the output voltage droped down to 3V and remained the load resistance was roughly 2.6Ohm.

    Best Regards, Adrian

  • In reply to Adrian Bucher1:

    Hi Adrian,

    Looks like the current limit response similar to TPS25942A device. To confirm, can you share the marking on the device and zoom-out waveform marked in RED below with time scale 100ms/div.

      

    BR, Rakesh

    --------------------------------------------------------------------------------------------------------

    To find the latest information on Power Switches, Visit www.ti.com/powerswitch 

  • In reply to Rakesh:

    Hi Rakesh

    Attached the device marking and waveform.

    Best Regards,

    Adrian

  • In reply to Adrian Bucher1:

    Hi Adrian,

    Thank you.

    Is the input supply voltage of the efuse is stable and constant ?

    Best regards,

    Rakesh

    --------------------------------------------------------------------------------------------------------

    To find the latest information on Power Switches, Visit www.ti.com/powerswitch 

  • In reply to Rakesh:

    Hi Rakesh

    The input voltage has a drop of roughly 200mV when I_Load is rising from 650mA to 1.1A. This drop is caused by the pcb track of the supply voltage. Besides that, the input voltage looks stable and constant.

    Best regards, 

    Adrian

  • In reply to Adrian Bucher1:

    Hi Adrian,

    Thank you for the confirmation.

    It is behaving like TPS25942A device. Do you have local TI sales contact to submit these units for FA ?

    BR, Rakesh

    --------------------------------------------------------------------------------------------------------

    To find the latest information on Power Switches, Visit www.ti.com/powerswitch 

  • In reply to Rakesh:

    Hi Adrian,

    Have you reached out to TI sales ?

    BR, Rakesh

    --------------------------------------------------------------------------------------------------------

    To find the latest information on Power Switches, Visit www.ti.com/powerswitch 

  • In reply to Rakesh:

    Hi Rakesh,

    Yes, I forwarded my issue to our FAE.

    I will let you know as soon as I have further information.

    Best Regards

    Adrian

  • In reply to Adrian Bucher1:

    Ok Adrian

    --------------------------------------------------------------------------------------------------------

    To find the latest information on Power Switches, Visit www.ti.com/powerswitch 

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