• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 1628 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.

TPS62000: how to measure Rdson?

ANURAJ NK
Intellectual 510 points
Part Number: TPS62000

Hi,

   I am looking for test procedure to validate the RDS(on) of P and N FET of the  buck converter (TPS62000) parameters which is listed in the datasheet.

To measure the RDS(on) of P-FET, I have to operate the Buck into 100% duty cycle mode (so that P- FET will be ON and N-FET will be OFF), which can be achieved by keeping the input voltage close to output voltage. To measure the RDS(on) of N-FET, I have to operate the Buck into 0% duty cycle mode (so that P- FET will be OFF and N-FET will be ON). Driving EN pin low or keeping input voltage less than output will put the N FET to OFF state? Please let  know if any alternate procedure is available for validating these datasheet parameters.

Regards

Anuraj NK

   

  • 0
    TI__Guru**** 150730 points
    Hi Anuraj,

    TI takes care of this, so you don't have to.

    As well, this is an extremely old device. Do you have a new design that you are working on?

    Yes, you can measure the high side FET in that way. I can't think of a way to measure the low side FET in a DC condition. You would need to measure the inductor current and the drop across the low side FET during the off time during a single switching pulse to compute Rdson.