Delivery time: days
Manufacturer: Opt Lasers
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The new version of the classic laser diode driver with thermal protection ensures proper work of the laser diode and protects it from overheating. The 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 100 kHz. The exemplary test with the 100 kHz square-wave input signal modulation is shown below.
LPLDD5A-12V-TP driver is capable 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.
This driver has a thermal protection system which protects laser diode from overheating.
- In case of normal operation, when a thermistor measures the temperature of a laser unit below 40 degrees of Celsius, the green LED is ON. Overheat pin status: High, output 5 V DC.
- When the temperature measured by the thermistor reaches 40 degrees Celsius, the red LED starts blinking. Green LED is still ON. Overheat pin status: high, output 5 V DC.
- When the temperature measured by a thermistor reaches 45 degrees Celsius, the red LED is ON, and the laser diode driver switches off. Overheat pin status: Low, output 0 V DC. The laser diode driver will get to normal operation when the temperature measured by a thermistor is lower than 40 degrees.
- Two blinking LEDs means that there is no connection between the laser diode driver and a thermistor or the connection was temporarily lost. When the connection established - reset the driver. To reset the driver, disconnect and connect the power supply of the driver.
- Modulation input of the driver is protected by a 5V1 Zener diode. Nevertheless, one should not use a modulation voltage higher than 5 V.
- The output of the driver is protected by the Schottky diode which doesn't allow the reverse voltage to appear as well protects from ESD.
Recommendations and requirements
The supply voltage should always be set 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 - operating 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% of the preset (via potentiometer) current at the output, analogically by using 4 V you get 80% of the preset current value. 0
For powering the driver, we recommend the use a cable with cross-section of 0.1* I [mm2], where I operating current.
Depending on the used laser diode and PSU, you should assure proper cooling of the MOSFET transistor. The MOSFET 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 may damage the driver and can be dangerous for the Laser Diode.
Test done using:
- 6 W NUBM44 laser diode (at 3.3A)
- 15 cm long 0.35 mm2 wires
- 12 V input voltage
- 80 x 80 x 20 heat sink on power MOSFET
|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|
|Vcc Logic||7.5 – 24.0 V|
|Vcc Laser Diode||3.3 – 24.0 V|