iC-WKM M-TYPE CW LASER DIODE DRIVER Rev C1, Page 1/9 FEATURES APPLICATIONS Optimised for M-type laser diodes Blue laser diodes (single supply, case grounded) Laser diode modules CW operation up to 350 mA from a single supply of 3.6 to 15 V Laser diode pointers Rapid soft start after power-on Laser levels Simple power adjustment via an external resistor Bar-code readers Integrated reverse polarity protection for the iC and laser diode Strong suppression of transients with small external capacitors integrated yback path Permanent shutdown with excessive temperature and overcurrent (i.e. if the laser diode is damaged or the feedback current path fails) PACKAGES Two feedback inputs permit all current laser diode types to be used (M/P/N congurations) Modulation via the feedback inputs possible Wide monitor current range from 2.5 A to 6.25 mA DFN10 SO8tp 4 mm x 4 mm thermal pad BLOCK DIAGRAM Pin numbers given for SO8 package only. Copyright 2006 iC-Haus iC-WKM M-TYPE CW LASER DIODE DRIVER Rev C1, Page 2/9 DESCRIPTION iC-WKM is a driver for laser diodes in continuous 2.5 A to 6.25 mA). The capacitor at CI determines wave operation with laser currents of up to 350 mA, the control time constants and start-up time. which requires only four external components. The wide power supply range of up to 15 V allows for op- A second monitor input, pin MDK, allows the driver eration of blue laser diodes, e.g. by Nichia or Sanyo. to be used for P-type laser diode conguration alter- The driver is optimised for M-type laser diodes and natively, it can be used as an analogue modulation allows the operation from a single supply and the input (DC to a few kHz). connection of the laser diode case (common cath- ode) with ground. In the event of failure, such as overcurrent in the laser path with a lack of feedback, for example, a quick The iC includes integrated circuitry protecting against power lockout is activated. The shutdown persists destruction by ESD, excessive temperature and over- until power is reapplied, permitting a restart. The current plus a soft start of the regulator to protect the strain on power packs and batteries is relieved and laser diode when the power supply is switched on. the laser class is retained even in the event of a dis- The iC also lters the laser diode power supply for turbance. transients. iC-WKM offers additional protection by means of The regulator is adapted to the laser diode by an ex- spike detection at pin MDA. Should spikes or oscilla- ternal resistor at MDA. The monitor current acts as tion occur at pin MDA the power lockout is activated a reference and is regulated independent of the in- after a certain time-out. uence of temperature and supply voltage (range: pprreelliimmiinnaarryy