• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 766 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.

Constant Current Laser Driver with Modulation

Billy Fanelli
Prodigy 10 points
Other Parts Discussed in Thread: LM3406

Looking to us an adjustable Simple Switcher as a current source for a laser diode.  The application requires that the laser be blanked and I was curious about how fast the enable on/off pin of the regulator would be able to do this.  The application would include a low value current shunt and amplifier to measure the current output and adjust the regulator.  

The forward drop of the diode would be somewhere between 3 and 6 volts, forward current being no more than 2 amps.

One requirement of the regulator is that it not have a softstart due to the need for a clean blanking signal.

Any suggestion on a specific regulator and or supporting parts is appreciated.  

  • 0
    TI__Genius 15810 points

    Hello,

    The toggling speed of the EN pin will be limited by the soft-start on pretty much all of our regulators. All of our regulators (SIMPLE SWITCHER) have at least a preset soft-start time because these devices are all voltage regulators.

    What you might be able to use would be a LED driver. LED drivers are inherently current regulators, e.g. LM3406. Using the DIM Pin, you can turn the part on and off at a very high rate.

    I hope this helps.

    Regards,
    Akshay