iC-WJ, iC-WJZ
LASER DIODE DRIVER
Rev C1, Page 2/12
DESCRIPTION
The iC-WJ and iC-WJZ devices are driver ICs for An external resistor at ISET is utilised to adapt the
laser diodes in continuous and pulsed operation up power control to the laser diode being used. The ca-
to 300 kHz. The laser diode is activated via switching pacitor at CI determines the recovery time constants
input IN. A control to the mean value of the optical and the start-up time.
laser power and integrated protective functions en-
sure nondestructive operation of the sensitive semi- A watchdog circuit monitors the switching input IN.
conductor laser.
If IN remains low longer than preset by the capac-
itor at CWD, the capacitor of the power control is
The IC contains protective diodes to prevent destruc- discharged at pin CI. This ensures that the current
tion due to ESD, a protective circuit to guard against through the laser diode during the next high pulse at
overtemperature and undervoltage and a soft-start input IN is not impermissibly high.
for the laser diode driver to protect the laser diode
when switching on the supply voltage.
PACKAGES SO8, MSOP8 to JEDEC Standard
PIN CONFIGURATION SO8
(top view)
PIN FUNCTIONS
No. Name Function
1 GND Ground
2 CWD Capacitor for Watchdog
1
8
7
6
5
KLD
GND
3 CI
Capacitor for Power Control
2
4 ISET Attachment for RSET
5 VCC 5 V Supply Voltage
AMD
CWD
3
CI
IN
6 IN
Input
4
7 AMD Anode Monitor Diode
8 KLD Cathode Laser Diode
VCC
ISET
PIN CONFIGURATION MSOP8
(top view)
1
GND
KLD
AMD
IN
CWD
CI
ISET
VCC
ICHAUS [ IC-HAUS GMBH ]
