Description EU-39 is a small and inexpensive DRIVER board for continues wave (CW) operation. It is suitable for LASER DIODEs with external PD input. The output current can be easily adjusted by a potentiometer up to 300 mA. The LASER DIODE output power is independent from the supply voltage.
• LASER DIODE DRIVER • Supported LASER DIODEs without external PD input • Adjustable LASER DIODE current, up to 300 mA • LASER DIODE output power independent from support voltage
■ General description ELM185xB is a bipolar type LASER DIODE DRIVER IC with internal APC circuit which consists of a reference voltage source, an error amplifier, and a thermal shutdown circuit for protection. With reference voltage source, the output of LASER is comparatively stable during the change of power voltage and temperature. With its small package, ELM185xB is possible to be assembled within small areas on the board. When control loop damage occurs, ELM185xB is also capable of limiting the LASER drive current; limited current value can be adjusted by an external resister on ILM. KLD output drive current can reach up to 400mA (max.). For avoidance of damage of LASER DIODE, the Zener DIODE which is included in ELM185xB is able to absorb 8V surge between VCC-GND. ELM185xB is able to drive various types of LASER DIODE modules (LDM); please refer to applicable LASER DIODE modules for further information. ELM185xB can not only drive LASER DIODE by APC control, but also by constant current with internal constant current setup function; therefore, ELM185xB can also be used as constant current DRIVER for LASER DIODE, high luminous LED, etc.
■ Features • Low voltage operation : 2.0V • Low current consumption operation : Typ.1mA • LASER drive current : Max.400mA • Internal voltage reference : Typ.0.30V • Thermal shutdown circuit : Typ.150°C • Package : SOT-26 • Zener DIODE for surge absorption included
■ Application • DRIVER for LASER DIODE in LASER pointer, LASER level, etc. • DRIVER for constant load current such as LED, etc.
FEATURES ♦ LASER DIODE DRIVER for continuous and pulsed operation (CW to 300 kHz) up to 250 mA ♦ Averaging control of LASER power ♦ Simple adjustment of the LASER power via external resistor ♦ Adjustable watchdog at the switching input to protect the LASER diode ♦ Soft-start after power-on ♦ DRIVER shutdown with overtemperature and undervoltage ♦ Single 5 V supply ♦ Simple circuitry ♦ iC-WJ for LASER DIODEs with 50 to 500 µA monitor current ♦ iC-WJZ for LASER DIODEs with 0.15 to 1.5 mA monitor current