Constant Current Laser Diode Driver Circuit Using OPA2350 OpAmp

  • Rajkumar Sharma
  • 13820
    Views
  • easy
  • Tested

The voltage-controlled current source circuit can be used to drive a constant current into a signal or pump laser diode. This simple linear driver provides a cleaner drive current into a laser diode than switching PWM drivers. The basic circuit is that of a Howland current pump with a current booster (Q1) on the output of a R-R CMOS OPA2350 op amp (U1). Laser diode current is sensed by differentially measuring the voltage drop across a shunt resistor (RSHUNT) in series with the laser diode. The output current is controlled by the input voltage (VIN) that comes from Trim pot PR1.

Features

  • Supply 3,3V DC
  • Load Up to 300mA
  • PR1 Trimpot Current Adjust

Schematic

Parts List

Photos

Video

PCB

Comments

  • Mitek

    Hi,
    looks interesting. Can you say ZD1 voltage level ?

    3 years ago
    • admin

      You can use LM385-1.2 voltage reference from TI.com but the circuit will work without it.

      3 years ago
  • rawan alsaadi

    is there any equivalent ic instead of opa2350?

    2 years ago
  • Damian W

    F.e MCP6232T from Microchip

    1 year ago
  • naved

    i have to design a laser diode circuit for dental application in pain relief.
    please help me in circuit design process

    4 months ago

Leave a Reply

RELATED PROJECTS

By continuing to use the site, you agree to the use of cookies. more info

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.

Close