One channel 5A 7,5-12V laser diode driver with implied thermal protection and heatsink. Small aluminum plate is added to dissipate the heat better and make it easier to mount on the base plate of the user's device. Driver shuts down the diode circuit when the temperature of a sensor exceeds 45 degrees Celsius. Three LEDs show the current driver status. 10A version of the driver is available.
Delivery time: days
Manufacturer: Opt Lasers
Available quantity: 6 Item Items Last items in stock!
|Dimensions||36 x 31 mm|
|Input Voltage||7,5 - 12 V|
|Max Ouptut Current||5 A|
|Max. Modulation Frequency||100 kHZ|
|Max. Power Dissipation||15W|
|Modulation Input Voltage Range||0 - 5 V|
|Pre-Set Current Setting||2000 mA|
|Softstart Time||1 ms|
|Temperature Sensor Type||10k NTC thermistor|
|Rise Time||less than 1.5µs|
|Fall Time||less than 1.5µs|
|Noise and Ripple (RMS)||12.5 mA|
|Minimum Current (3% Noise)||500 mA|
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.
Thanks to an included radiator you do not need to worry about heat dissipation, drilling and isolation of power transistor from the heatsink. It is a fully functioning component ready to be mounted in laser devices.
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.