700 mW red laser diode with a wavelength of 638 nm manufactured by Hitachi under the brand Oclaro.
LPLDD-1.5A-12V Laser Diode Driver
Single channel 1.5 A, 3.3-12 V laser diode driver. The low current version of the LPLDD-5A-12V dedicated to working with single and multi-mode laser diodes. Proper shunt resistor and customized parts assure low noise even with small current values. Analog input allows modulating the current with the speed of up to 100 kHz square waves.
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About the LPLDD-1.5A-12V Laser Diode Driver
The low current version of LPLDD laser diode driver. Driver’s maximum output current value is 1.5 A. This version was created for lower power laser diodes in order to assure smooth waveforms, fast-rising/falling time and low ripple.
- LED diode showing that driver is connected.
- Softstart protect against switch-on effects
- It has labels on the board - more intuitive and easier to set
- Smaller size - only 15 mm x 30 mm
- The large surface of copper which cools the sense resistor.
The basic driver for powering laser diodes with the option to adjust maximum output current in the range of 0-1.5 A, and to modulate the current flowing through the diode with frequency up to 100 kHz.
Since it is a lite version of the laser diode controller 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 1.5 W of output power, 445 nm, 520 nm, 638 nm, 650 nm, 808 nm, 980 nm.
The examples of diodes are 1 W 445 nm, 700 mW 635 nm, 200 mW 808 nm, 1 W 808 nm, 1 W 520 nm, and all low power single mode laser diodes.
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 = 0.6* I + Vd
- Vin is the input voltage
- Vd is the diode working voltage
- I - 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. The short circuit between MOSFET and heat sink/plate can damage the driver and can be dangerous for the Laser Diode.
Modulation input of the driver 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 laser controller is protected by Schottky diode which doesn't allow the reverse voltage to appear.
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