LPLDD-5A-24V-TP Laser Diode Driver
Single channel 5 A 3.3-24 V laser diode driver with thermal protection. Based on many inquiries from customers, this version of the LPLDD-5A-24V driver is equipped with thermal protection which switches off the laser diode circuit if the temperature exceeds 45 degrees of Celsius. The thermal sensor is included. Additional LEDs signalize the current status of the laser controller.
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About the LPLDD-5A-24V-TP Laser Diode Driver
LPLDD-5A-24V-TP Laser Diode Driver is 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-24V-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.
When you are powering the laser diode controller from one power supply in the range of 7.5 - 24 V DC the jumper should be connected.
In the case of powering a diode with low voltage diode, i.e 3 V, one should use two power supplies and the jumper should be disconnected.
Note: this power supply voltage should be close to the one that laser diode requires.
The logic line has to be powered with voltage in the range of 7.5 - 24 V DC and laser diode line has to be connected to the power supply in the range of 3.3 V - 24 V DC
This feature allows you to power your laser diode from low voltage, therefore, lower power dissipation produced by the driver.
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 a 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.
The test was done using:
- 6 W NUBM44 laser diode (at 3.3 A )
- 15 cm long 0.35 mm2 wires
- 12 V input voltage (@ 10% duty cycle)
- 80 x 80 x 20 heat sink on power MOSFET
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