700 mW red laser diode with a wavelength of 638 nm manufactured by Hitachi under the brand Oclaro.
LPLDD-5A-12V Laser Diode Driver
Single channel, 5 A, 3.3-12 V laser diode driver. Most basic and versatile laser diode driver dedicated to working with almost all available laser diodes on the market. High current, small size, short rise/fall time and up to 12 V compliance voltage make this driver the best choice for small and medium power applications which require 0 - 5 A working current range.
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About the LPLDD-5A-12V Laser Diode Driver
LPLDD-5A-12V Laser Diode Driver is the new version of the classic laser diode driver:
- Added LED diode showing that driver is connected.
- Added soft-start to protect against switch-on effects
- Added labels on the board - more intuitive and easier to set
- Smaller size - only 15 mm x 30 mm and capable of driving 5 A!
- Added a large surface of copper which cools the sense resistor.
The basic medium-power 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 100 kHz.
A test with the 100 kHz square-wave input signal modulation is shown below.
The test was done using:
- 6 W NUBM44 laser diode
- 15 cm long 0.35 mm2 wires
- 12 V input voltage
- 80 x 80 x 20 heat sink on power mosfet
Since it is the lite version of the driver it does not have protection against polarity change. Be sure you connect it accordingly to the labels on the PCB.
By selecting an appropriate PSU the driver in question, it is possible to power literally every laser diode available on the market up to 5 W - 405 nm, 445 nm, 520 nm, 638 nm, 650 nm, 808 nm, 980 nm.
The examples of diodes 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, 1 W 520 nm.
Recommendations and requirements
The supply voltage should be always higher than or equal to 3.3 V. The minimum supply voltage for other situations is given by the formula:
Vin = 0,2* I + Vd
- Vin is the input voltage
- Vd is the diode working voltage
- I - the desired maximum current
Modulation input can be used as TTL input with its logic levels of 0 V and 5 V 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 a cross-section of at least 0.35 mm2.
Depending on the used laser diode and PSU, you should monitor and assure proper cooling for the MOSFET transistor. The MOSFET/MOSFETS must be isolated from the heat sink/plate with the silicon pad as well as the plastic sleeve. A short circuit between MOSFET and heat sink/plate can damage the driver and can be dangerous for the Laser Diode.
Modulation input of the laser controller is protected by a 5V1 Zener diode. Nevertheless, one should not use modulation voltage higher than 5 V. Schottky diode is being used for ESD protection.
The output of the driver is protected by Schottky diode which doesn't allow the reverse voltage to appear.
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