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HKMSOP8 Datasheet(PDF) 2 Page - Roithner LaserTechnik GmbH

Part # HKMSOP8
Description  155MHz LASER SWITCH
Download  8 Pages
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Manufacturer  ROITHNER [Roithner LaserTechnik GmbH]
Direct Link  http://www.roithner-laser.com
Logo ROITHNER - Roithner LaserTechnik GmbH

HKMSOP8 Datasheet(HTML) 2 Page - Roithner LaserTechnik GmbH

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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.
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
of the emitted laser power is constant (APC), pro-
viding there is a constant duty cycle and a switching
frequency higher than 100 kHz.
OVERTEMP.−
SHUTDOWN
iC−HK/B
CI
LDK
EN1
EN2
AGND2
AGND1
GND
8
3
1
5
4
2
6
VDD
7
LD
RK1
RK2
CLDA
M2
M1
+3.5..5 V
V(CI)
Figure 1: Operation as a voltage-controlled cur-
rent source
TRANSIENT
OVER CURRENT
R
AGND
LDK
MDK
CI
MDA
NQ
LDA
GND
VCC
PROTECTION
+
D
1
OVERTEMP.
iC−WK
FEEDBACK MON./
0.5 V
VREF
8
3
1
5
4
2
6
7
100 nF
CVCC
47 nF..
CI
1 uF
CLDA
MD
LD
+3.5..5 V
0 V
1
RM
200
Ω..50 kΩ
6
0..
RK2
LED
RGND
CM
CLDA
2.2 nF
CLD
M1
M2
EN2
DGND
0..
RK1
LDK
VDD
EN1
EN2
iC−HK/B
AGND1
AGND2
GND
CI
OVERTEMP.−
SHUTDOWN
CVDD
EN1
100 nF
Figure 2: Operation of iC-HK/B in conjunction with CW driver iC-WK (see application information on
optional parts/connections)


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