5 Amp, 10 Watt OEM Laser Diode Controller, Low Cost

Product Overview:

5 Amp, 10 Watt Laser Diode Controller, Powerful OEM Solution

The single channel 5 A, 3 - 24 V laser diode driver with digital temperature controller circuit and anodized heat sink. The heat sink is properly sized to allow the driver to work well with up to 10 W power dissipated on the output power transistor. The temperature controller output is Pulse Width Modulated to reduce overall power consumption, and employs a PID algorithm to maintain the set temperature.

The logic part of the laser controller is powered from TEC line, it allows to use 3.3 V PSU to power the infrared diodes without requiring excessive heat dissipation. TEC part should be connected even if not used to the voltage in 7.5 V - 24 V range.

The TEC temperature can be set in the range 0 – 40 °C. The controller drives the TEC using pulse width modulation (PWM), which reduces the overall power consumption and minimizes the heat dissipated on the MOSFET. The TEC controller operates only in cooling mode, which increases power efficiency and also allows for a smaller board footprint with fewer components. The compacts size allows it to be used in small devices such as compact laser projectors. Thanks to an included heat sink you do not need to worry about heat dissipation, drilling holes, and isolation of power transistors from the heat sink. It is a fully functioning component ready to be mounted in laser devices.

Laser Diode Protection Features

The circuit responsible for powering a laser diode is protected against reversed polarity. The high current Schottky diode of an extremely low forward voltage protects the laser diode against connecting reversed voltage. 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 5 V. Even with this added protection, the input should not be used with higher voltages.

A microcontroller ensures the proper operation of the entire system by continuously monitoring the thermistor connection. If the thermistor connection is lost, the controller switches off the laser diode current and the TEC current. The microcontroller also switches off the laser diode and TEC if the thermistor reaches a temperature above 50 °C.

The laser diode controller is fitted with a two-second soft-start designed to protect the laser diode against switch-on effects.