One channel 5A 7,5-12V laser diode driver with thermal protection. Based on many inquiries from customers, this version of the LPLDD-5A-12V driver is equipped with thermal protection which switches off the laser diode circuit if the temperature exceeds 45 degrees. Thermal sensor is included. Additional LEDs signalize the current status of the driver. 10A version of the driver is available.

Reference: 001288

EAN13: 5902693110767


Available quantity: 98 Items

    $45.00 tax excl.

    Technical Data

    Dimensions36 x 31 mm
    Input Voltage7,5 - 12 V
    Max Ouptut Current5 A
    Max. Modulation Frequency100 kHZ
    Max. Power Dissipation15W
    Modulation Input Voltage Range0 - 5 V
    Modulation TypeAnalog
    Pre-Set Current Setting2000 mA
    Softstart Time1 ms
    Temperature Sensor Type10k NTC thermistor
    Rise Timeless than 1.5µs
    Fall Timeless than 1.5µs
    Noise and Ripple (RMS)12.5 mA
    Minimum Current (3% Noise)500 mA

    More info

    New version of classic laser diode driver with thermal protection ensures proper work of the laser diode and protects it from overheating. When the laser head reaches 40 degrees Celsius, the orange led starts to glow. Reaching 45 degrees makes the red diode glowing and the driver switches off the laser diode for as long as the temperature is not lower than 40 degrees. While in overheat mode, it also sends low signal on the output. In case the connection between driver and thermistor is lost all three diodes will blink.

    Green LED diode shows that driver is connected and temperature is not exceeded.

    Softstart protects againts switch-on effects It has labels on the board - more intuitive and easier to set. It has large copper surface which cools the sense resistor.

    Basic driver for powering laser diodes with the option to adjust maximum output current in the range of 0-5 A, and to modulate the current flowing through the diode with frequency up to 100kHz.

    A test with the 100kHz square-wave input signal modulation is shown below.


    Test done using:

    6W NUBM44 laser diode

    15cm long 0.35mm2 wires

    12V input voltage

    80x80x20 heatsink on power mosfet

    By selecting an appropriate PSU the driver is able to power literally every laser diode available on the market up to 5W - 405 nm, 445 nm, 520 nm, 638 nm, 650 nm, 808 nm, 980 nm. The examples of diodses are: 1 W 445 nm, 3,5 W 445 nm, 700 mW 635 nm, 200 mW 808 nm, 1 W 808 nm, 5 W 808 nm, 1W 520nm.

    Recommendations and requirements

    The supply voltage should always be set higher than or equal to 3,3V. The minimum supply voltage for other situations is given by the formula:

    Vin = 0,2* I + Vd

    Vin is input voltage

    Vd is diode working voltage

    I - desired maximum current

    Modulation input can be used as TTL input with its logic levels of 0V and 5V or as an analog input. Analog modulation means that by using 2,5 V on ANG input you get 50% output power, analogically by using 4 V you get 80% output power, etc.

    We recommend the use of power cables with cross-section of at least 0.35 mm2.

    Depending on used laser diode and PSU, you should monitor and assure proper cooling for the MOSFET transistor. The MOSFET/MOSFETS must be isolated from the heatsink/plate with silicon pad as well as plastic sleeve. Short circuit between MOSFET and heatsink/plate can damage the driver and can be dangerous for the Laser Diode.


    This driver has thermal protection system which protect laser diode from overheating.

    Input is protected by 12V transil diode.

    Modulation input of the driver is protected by 5V1 Zener diode. Nevertheless, one should not use modulation voltage higher than 5V. Shottky diode is being used for ESD protection.

    The output of the driver is protected by shottky diode which doesn't allow the reverse voltage to appear.