iC-WJB
2.7 V LASER DIODE DRIVER
Rev E1, Page 1/12
FEATURES
o
o
o
o
o
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Simple APC adjustment via an external resistor
Continuous (CW) or pulsed operation of up to 300 kHz
Laser diode current of up to 100 mA
Adjustable watchdog for input signals
Soft power-on and thermal protection
Driver shutdown in case of overtemperature and undervoltage
Operation at 2.7 to 6 V with two to four AA/AAA cells
Protection against reverse polarity
APPLICATIONS
o
Battery supplied LD modules
o
LD Pointers
PACKAGES
SO8
MSOP8
BLOCK DIAGRAM
DRIVER STAGE
REF
VCC
5
C1
47uF
R2
2Ω
VB
2.7..6V
REFERENCE
C3
2nF
RSET
2.7..330kΩ
4
ISET
THERMAL
SHUTDOWN
KLD
8
R1
0..2Ω
POWER DOWN
REF
D1
Z6V8
LD
MD
INPUT
VCC
AMD
IN
6
WATCHDOG
1
3
7
iC−WJB
CI
3
CI
470nF
GND
1
alternative LD model
LD
MD
(VCC > 4.5 )
CWD
2
CWD
(..pF)
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ICHAUS [ IC-HAUS GMBH ]
