IC-WKM_15 Datasheet, PDF (2/12 Pages) IC-Haus GmbH – M-TYPE CW LASER DIODE DRIVER

iC-WKM
M-TYPE CW LASER DIODE DRIVER
Rev C2, Page 2/12
DESCRIPTION
iC-WKM is a driver for laser diodes in continuous
wave operation with laser currents of up to 350 mA,
which requires only four external components. The
wide power supply range of up to 15 V allows for op-
eration of blue laser diodes, e.g. by Nichia or Sanyo.
The driver is optimised for M-type laser diodes and
allows the operation from a single supply and the con-
nection of the laser diode case (common cathode)
with ground.
The iC includes integrated circuitry protecting against
destruction by ESD, excessive temperature and over-
current plus a soft start of the regulator to protect the
laser diode when the power supply is switched on.
The iC also filters the laser diode power supply for
transients.
The regulator is adapted to the laser diode by an
external resistor at MDA. The monitor current acts
as a reference and is regulated independent of the
influence of temperature and supply voltage (range:
2.5 µA to 6.25 mA). The capacitor at CI determines
the control time constants and start-up time.
A second monitor input, pin MDK, allows the driver to
be used for P-type laser diode configuration; alterna-
tively, it can be used as an analogue modulation input
(DC to a few kHz).
In the event of failure, such as overcurrent in the laser
path with a lack of feedback, for example, a quick
power lockout is activated. The shutdown persists un-
til 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.
iC-WKM offers additional protection by means of spike
detection at pin MDA. Should spikes or oscillation oc-
cur at pin MDA the power lockout is activated after a
certain time-out.