• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 494 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.

Fixed or Variable Frequency

Hari Thazhe Oyyoth
Intellectual 380 points

Hi,

May I know how to decide when to use fixed frequency DC/DC converter and when to use variable frequency DC/DC converter.

Regards

Hari

  • 0
    TI__Genius 17380 points
    Hi Hari,

    In general:
    Fixed frequency operation
    – Synchronize multiple devices
    • Eliminate beat frequencies between multiple converters
    • Ripple cancellation to reduce losses in capacitors and PCB
    traces
    – EMI peaks consistent at any operating mode
    – Minimum controllable pulse width

    Variable frequency operation
    – Easier to compensate
    – Lower peak EMI, higher average
    – Faster load transient response
    – Could be lower cost due to lower component count