LPLDD-5A-24V-PID

One channel 5A 3-24V laser diode driver with a built-in digital temperature controller. Analog input allows to modulate the current which is proportional to the 0-5V voltage given on the input. Temp controller circuits is powering whole logic part of the driver allowing to use independent power supply to meet proper compliance voltage of the laser diode. 10A version of the driver is available.

Reference: 000638

Manufacturer:

Available quantity: 46 Items

$67.00 tax excl.

Technical Data

Compliance Voltage3,3 - 24 V
Dimensions58 x 45 mm
Max Ouptut Current5 A
Max. Modulation Frequency100 kHZ
Max. Power Dissipation15W
Max. TEC Current15 A
Modulation Input Voltage Range0 - 5 V
Mounting Hole Spacing38 x 48 mm
Pre-Set Current Setting2000 mA
Softstart Time2000 ms
Temperature Sensor Type10k NTC thermistor
Transistor Type UsedN-MOSFET
Temperature Stabilization Accuracy±0,1 °C
Rise Timeless than 1.5µs
Fall Timeless than 1.5µs
Noise and Ripple (RMS)12.5 mA
Minimum Current (3% Noise)500 mA

More info

New version (fourth) of the driver has been released.

 

Main features:

Screw connectors - all in the same size, easier to connect wires

Test jumper - possibility of switching on the driver without external analog signal

Current monitor output - convenient place to measure the current flowing through the diode

Signal diodes: diode enable, TEC, warning

Labels on the board - more intuitive and easier to set

High TEC current - up to 15A

No heat sink

 

Logic part of the driver is powered from TEC line, it allows to use 3,3V PSU to power the infrared diodes without big amount of dissipated heat. TEC part should be connected even if not used to the voltage in 7,5V - 24V range.

 

The subject of the auction is a professional driver for laser diodes with a built-in digital temperature controller using the PID algorithm. Its size allows for mounting it in small devices such as compact laser projectors. It is a fully functioning component ready to be mounted in laser devices. One should provide proper cooling of the power mosfets screwing them to metal heat sink. Without cooling mosfets may be damaged and laser diode burned. Proper silicone pads are included.

 

Despite its small size, the driver is able to work with thermocouples (Peltier modules) such as 12706, 12708, 07113, and many others that draw up to 15 A of current. Despite high current, thanks to using PWM the controller does not heat up. Used PID algorithm learns the behavior of the system, hence quicker reacts to changes in temperature and provides higher accuracy of stabilization. The driver easily handles all laser diodes of up to 5W, and at the customer's request it is possible to customize the driver up to 10A version. Separate laser diode supply voltage input and TEC input enable the selection of any components the driver can work with. Analog input allows for the modulation of the current flowing through the diode up to 100kHz. Two potentiometers are used to set the values of maximum diode current and bias current. The third potentiometer is responsible for setting the setpoint temperature in the range of 0 to 40 degrees Celsius. The possibility to power laser diodes of any wavelength and control the Peltier modules with a rated voltage from 7,5 to 24V and current up to 15A make this driver truly unique and extremely versatile. Diode line can be powered with voltages from 3V up to 24V so it makes it fully functionable for any kind of laser diode.

 

At another auction you can find the same driver with a heat sink. 

 

Recommendations:

The minimum diode input voltage should be higher or equal to 7V, in other situations it is given by the formula:

Vin = 0,4* I + Vd + 0,6V

Vin - input voltage

Vd - 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. This input can also be used as PWM input the only requirement is that base frequency of the PWM signal is in range of 5-20kHz,

 

You should be very careful not to cause short circuit between the + (VCC) of the power supply and - (GND) of the analog input, as a thin GND analog path can be irreparably damaged.

 

We recommend the use of power cables with cross-section of at least 0.5 mm2.

 

Protection:

The circuit responsible for powering a laser diode is protected against reversed polarity. High current Schottky diode of an extremely low forward voltage secures the laser diode against connecting reversed voltage with the aim of protecting frequently the most expensive part of the entire device - a laser diode. In turn, the low forward voltage does not cause excessive heat loss during normal operation.

 

The analog input is protected by a 5V1 Zener diode on occasion there appears the voltage higher than 5V. Despite everything, this input should not be used with higher voltages.

 

A microcontroller ensures the proper operation of the entire system.

 

At start the microcontroller is checking the connection with a thermistor. If there is no thermistor used the WARNING LED is blinking but the driver is still working. If the connection with thermistor is lost during normal work, microcontroller turns off the laser diode supply circuit and does not allow for its futher load, it also switch off the DIODE LED and switch on WARNING LED. The TEC line is also switched off. The same situation happens when the thermistor reaches temperature above 50 degrees Celsius

 

The driver is fitted with a two-second softstart designed to protect the laser diode against switch-on effects.

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