• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 276 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.

DCP020507: Vs Start-Up Slew Rate

Shinichi Yokota
Genius 9715 points
Part Number: DCP020507

Hello,

Does DCP020507U have a restriction on VS slew rate at start-up? It seems the device fails to start up properly when the slew rate is too slow. When VS rises 0.1 V a step at a time on a trial basis, the VS begins to draw a large current of more than about 300 mA and a low switching frequency appears at SYNC pin at around 3.4 or 3.5 V of VS.

I suspect this behavior has something to do with the VS slew rate. If the DCP020507U requires a certain range of VS slew rate, I'd like to know the number.

Best regards,
Shinichi Yokota

  • 0
    TI__Expert 8130 points

    Hi Shinichi,

    If VS ramps very slowly, the module may experience trouble starting-up as you mentioned due to the high duty cycle and inrush current.

    Unfortunately, I do not have a number for a required VS slew rate and unable to get into the lab to run some bench tests. All I can recommend at the moment is to increase the rate of Vin ramp. That should allow the device to get through the inrush condition/start-up.

    Regards,
    Alejandro