• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 62 subscribers
  • Views 118 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

TPS25983: Output pulled down during testing of this circuit

Sadheedh Jiffry
Prodigy 50 points
Part Number: TPS25983


Tool/software:

Hello! 

I think there is an issue with this circuit or behaviour of the eFuse. When I connect a 24V in through the main switch, there is the same voltage between the eFuse EN/UVLO and GND terminals. However, the output seems to be pulled LOW. 

The values I have selected for the resistors and capacitors are: 

Rvl1 1 MOhm
Rvl2 9.091 kOhm
Cin 0.1 uF
CNRetry 2.2 nF
CRetry_delay 2.2 nF
RI_lim 115 Ohm
CiTimer NC 
CdVdt 3.9 nF
Rimon 1050 Ohm
Rpg 10 kOhm
COUT 100 uF

I selected these to have a current limit of 13A. When I tested this, I only had a minor load across the OUT, for a DCDC powering a small <1A component. The test results were:

Vin = 25V

Vout = LOW. 

Please let me know if I have made a mistake or if you need any more information to help me fix this issue. Thank you!

  • +1
    TI__Mastermind 39295 points

    Hi Sadheedh,

    I am assuming your en resistive divider is as follows

    The EN pin voltage will be 0.22V for 25V Vin which will keep the device off. The EN voltage needs to be more than 1.2V for the device to turn on. Can you increase the pull down resistor so that voltage greater than 1.2V can build up.

    Best Regards,
    Arush

  • +1 in reply to Arush Gupta
    Prodigy 50 points

    Hi Arush, 

    Thank you for your quick reply! I tested it with the proper modifications and it is working as expected. 

    Thank you for your assistance!

    Kind Regards,
    Sadheedh