Laser Diode APC Driver ASIC:

The EDL-1 device is a driver for laser diodes in continuous wave operation which requires only few external components. The broad power supply range of 2.5V to 6V and the integrated protection allow for battery operation with a minimum of two cells. The driver includes integrated circuitry protecting against destruction by ESD, excessive temperature and over current. The driver also filters the laser diode power supply for transients. The power supply is regulated and adapted for the laser diode used by an external resistor at PD. The monitor current acts as a reference and is regulated independent of the influence of temperature and supply voltage (range: 10µA to 0.5mA). There is only one external capacitor required. In the event of failure, such as over current in the laser path with a lack of feedback, for example, a quick power lockout is activated. The shutdown continues until power is reapplied, permitting a restart. The strain on power packs and batteries is relieved and the laser class is retained even in the event of a disturbance.

• CW operation up to 60mA from 2.5..6V supply voltage
• Simple power adjustment via the external resistor
• Control loop accuracy better than 5% with changes in temperature, supply voltage and load current
• Permanent shutdown with excessive temperature and overcurrent (i.e. if the laser diode is damaged or the feedback current path fails)
• Wide monitor current range from 10µA to 0.5mA
• One external capacitor is required on output