0 - 1500mA LM358 + FET Laser Diode Driver (405nm / 445nm / 635nm / 650nm / IR Diodes)

Notes on Operation

This is a low dropout constant current driver board that requires the input voltage to exceed the required laser diode voltage by approximately 1.5V (the dropout). The drive FET is rated up to ~2000mA .depending on load and cooling.

• Dimensions :15mm x 20mm
• Reverse polarity protection
• Soft start protection for diode
• 0 - 1500mA (FET will need heatsink at highter currents)
• 3.5 - 12V depending on laser diode
• Output current set using the variable resistor on the circuit board
• Module housing (case pin of LD) is the positive connection and normally soldered to the pads marked power +ve/LD+ for portable battery powered lasers.
• For laser module applications the pad marked VCC on the circuit board can be connected to the positive power supply wire.
• Power –ve connection is normally made via a battery spring contact to the power –ve pad
• For a 1000mW 445nm Laser Diode (that requires an input voltage of ~5V) the board power supply should be greater than 6.5V, e,g, 2 x 3.7V RCR123/16340 lithium batteries 3 x 3.7V 18650 batteries