IC-VJ Datasheet, PDF (8/10 Pages) IC-Haus GmbH – LASER DIODE CONTROLLER

iC-VJ, iC-VJZ
LASER DIODE CONTROLLER
VCC [2V/div]
LASER Output [1mW/div]
Rev A1, Page 8/10
up transients (Fig. 7). This capacitor should be placed
close to the laser diode and not at the start of the LD
supply line.
C [50mV/div]
Figure 6: Turn-off behavior
An approx. 12 Ω series resistor at pin KLD reduces
the iC power consumption and damps possible reso-
nances of the load circuit caused by the inductive LD
supply line. This resistor is useful for many applica-
tions, also for those which do not operate via cable.
Operation of a laser diode via cable
It is recommended to connect a capacitor from 1 nF up
to 10 nF across the laser diode in order to protect the
laser diode against destruction due to ESD or build-
When the LD supply line is laid out on the PCB, the
forward path VCC should be arranged in parallel with,
i.e. be close to the return path to KLD, even when the
line is only a few centimeters in length.
Sync
DC−Monitor
5V
13
MO
R3
10kΩ
C3
100nF
4
12
MI
VCC
C4
100µF
14
PRF
15
NPRF
OUTPUT
2
DIVIDER
Q ^16:1
NQ
NQ
4
MONITOR
7
REFERENCE
POWER ON
TH.− SHUTDOWN
DRIVER
1
AMD 1
1:1 iC−VJ
1:3 iC−VJZ
R5
KLD 2 ^12Ω
OSCILLATOR
3
R
5
R1
800Ω
RC
6
C1
100pF
ISET
11
RSET
5
6
iC−VJ/VJZ CI ^AGND
9
7
C2
470nF
GND
3
Figure 7: Operation of a laser diode via cable
LD
C5
5nF
MD