iC-VJ, iC-VJZ
LASER DIODE CONTROLLER
Rev A1, Page 8/10
VCC [2V/div]
LASER Output [1mW/div]
up transients (Fig. 7). This capacitor should be placed
close to the laser diode and not at the start of the LD
supply line.
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.
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.
5V
C [50mV/div]
Figure 6: Turn-off behavior
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-
Sync
DC−Monitor
R3
10kΩ
13
MO
4
MI
C3
100nF
12
VCC
C4
100µF
OUTPUT
14
Q
PRF
DRIVER
DIVIDER
16:1
NQ
1
LD
AMD
1
15
NQ
NPRF
4
2
1:1 iC−VJ
1:3 iC−VJZ
REFERENCE
POWER ON
TH.− SHUTDOWN
7
MONITOR
MD
C5
5nF
KLD
2
R5
12Ω
OSCILLATOR
3
5
6
GND
3
R
5
R1
800Ω
RC
6
ISET
11
RSET
iC−VJ/VJZ
CI
9
C2
470nF
AGND
7
C1
100pF
Figure 7: Operation of a laser diode via cable
ICHAUS [ IC-HAUS GMBH ]
