Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

  • State Resolved
  • Locked Locked
  • Replies 5 replies
  • Subscribers 65 subscribers
  • Views 668 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

Original question:

TPS54531: Custom design review

TPS54531: Inductor and diode running really hot despite low load

Michael Gilge
Expert 1710 points
Part Number: TPS54531

Hello,

we have followed the reference design as closely as possible. On the output we are drawing between 700mA and 1.5A of current @ 5V. The inductor and diode are running really hot.

We selected the part, partly because the efficiency graph is flat and gives good efficiency down to the mentioned load when the system is idle.

Is there anything we do wrong?

The inductor is rated at I=5A, Isat=11A and Rdc=28mOhm. So I have a hard time understanding, why the inductor would heat so much at e.g. 1.5A of output current.

Best regards,

Michael