IC-HK Datasheet, PDF (2/8 Pages) IC-Haus GmbH – 155MHz LASER SWITCH

iC-HK, iC-HKB
155 MHz LASER SWITCH
Rev F1, Page 2/8
DESCRIPTION
Laser Switch iC-HK/B enables the spike-free switch-
ing of laser diodes with well-defined current pulses at
frequencies ranging from DC to 155 MHz.
The diode current is determined by the voltage at
pin CI and by the resistors RK1 and RK2. The two
fast switches are controlled independently via CMOS
inputs EN1 and EN2. The laser diode can thus be
turned on and off or switched between different cur-
rent levels defined by the ratio of RK1 and RK2.
Each channel can be operated on 150 mA DC and
up to 700 mA pulsed current depending on the fre-
quency, duty cycle and heat dissipation.
of the emitted laser power is constant (APC), pro-
viding there is a constant duty cycle and a switching
frequency higher than 100 kHz.
+3.5..5 V
CLDA
LD
3
7
iC−HK/B
LDK
VDD
8
CI
M1
M2
EN1
1
V(CI)
EN2
5
The integrated thermal shutdown feature prevents
damage from excessive temperature.
iC-HK/B supplements the laser diode driver iC-WK
which uses the monitor current of the laser diode to
control the laser power. iC-WK therefore controls the
voltage at pin CI in such a way that the mean value
OVERTEMP.−
SHUTDOWN
AGND1
2
RK1
AGND2 GND
4
6
RK2
Figure 1: Operation as a voltage-controlled cur-
rent source
+3.5..5 V
CVCC
100 nF
6
VCC
TRANSIENT
PROTECTION
LDA
LED
MDK
1
D
−
MDA
+
VREF
0.5 V
CI
LDK
NQ
R
1
GND
iC−WK
OVER CURRENT
FEEDBACK MON./
OVERTEMP.
CM
RM
200 Ω..50 kΩ
AGND
RGND
DGND
0V
CLDA
1 uF
MD LD
CLD
2.2 nF
CVDD
100 nF
3
LDK
iC−HK/B
CI
8
M1
M2
CI
47 nF..
7
VDD
EN1
1 EN1
EN2
5 EN2
OVERTEMP.−
SHUTDOWN
AGND1
2
RK1
0..
AGND2 GND
4
6
RK2
0..
Figure 2: Operation of iC-HK/B in conjunction with CW driver iC-WK (see application information on
optional parts/connections)