Constant Current Laser Diode Driver Circuit Using OPA2350 OpAmp
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.
Supply 3,3V DC
Load Up to 300mA
PR1 Trimpot Current Adjust
Constant Current Laser Diode Driver Circuit Using OPA2350 OpAmp – [Link]
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