iC-NZ
FAIL-SAFE LASER DIODE DRIVER
Rev B2, Page 1/20
FEATURES
o
Peak value controlled three level laser switch for operation
from CW up to 155 MHz
o
Spike-free switching of laser currents of ca. 100 mA per
channel (320 mA total) from 3.5 to 5 V supply voltage
o
Single-failure-proof
o
System-enable with self test
o
Separate setting of laser power for each channel via external
resistors
o
Strong suppression of transients with very small external
capacitors
o
Adjustable laser current monitor
o
Safety shutdown with overcurrent, overtemperature and
undervoltage
o
Autonomous safety circuit for a second photo diode monitoring
the laser power
o
All current LD types can be used (M/P/N configurations)
o
Error signal output at shutdown
APPLICATIONS
o
Pulsed LD modules for safety
applications
o
Distance measurement
PACKAGES
QFN28 5 mm x 5 mm
BLOCK DIAGRAM
SDIS
+5 V
VDD
LDA
LENL
LENM
LENH
REGEN
Safety
Monitor
Diode
RSI
RSI
Current Monitor
RVDD
LDAOK
RSIOV
NSEN
NTREN
LDKH
LDKM
LDKL
CIH
MDOK
CIOK
LD MD
EN
ENCAL
NERR
NSF
FSM
LDKGND
NSEN
CIM
NPDR
TEMPOK
CIL
MDL
CIL
CIM
CIH
Safety
Monitor Diode
SMD
+
−
RSMD
VSH
+
−
VSL
SMD(0)
SMD(1)
Laser
Driver
VBG
and
Reference
VBG
and
Reference
AGND
VREF
RMDM
RMDH
RMH
RGND
RMM
RML
GND
suitable laser diode configurations
N
M
LD
LD MD
MD
P
MD LD
Copyright © 2007 iC-Haus
ICHAUS [ IC-HAUS GMBH ]
