• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 63 subscribers
  • Views 218 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.

Original question:

[FAQ] List of FAQs for TPS922055 / TPS922054 / TPS922053 / TPS922052 LED driver

TPS922053: Is it possible to modify FSET using an DAC?

Michiel Josephs
Prodigy 10 points

Tool/software:

Dear support,

In the datasheet of this chip, the FSET is set by a resistor.

We were wondering if it is possible to supply a reference voltage to the FSET pin by an DAC on our connected microcontroller to increase efficiency at different dimming levels.

Kind regards, Michiel

edit: I mean DAC of course instead of ADC

  • 0
    TI__Mastermind 23180 points

    Hi Michiel,

    Sorry. I am currently out of office. I will reply to you tomorrow when I am back to office. Thanks for your understanding.

    Best Regards,
    Steven

  • 0
    TI__Mastermind 23180 points

    Hi Michiel,

    Sorry for the late response. Please refer to my comments below:

    Michiel Josephs said:
    We were wondering if it is possible to supply a reference voltage to the FSET pin by an DAC on our connected microcontroller to increase efficiency at different dimming levels.

    You cannot supply a reference voltage to the FSET pin.

    One possible way is to use an array of FSET resistors with some MOSFETS to switch between different switching frequency settings.

    Best Regards,
    Steven