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iC-WKL Datasheet Preview

iC-WKL Datasheet

2.4V CW LASER DIODE DRIVER

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iC-WKL pdf
iC-WK, iC-WKL
2.4V CW LASER DIODE DRIVER
FEATURES
° CW operation up to 70mA from 2.4..6V supply voltage and
up to 4A with an external power transistor
° Rapid soft start after power-on typical within 70µs
° Simple power adjustment via the external resistor
° Control loop accuracy better than 1% with changes in
temperature, supply voltage and load current
° Integrated reverse polarity protection for the iC and laser
diode
° Strong suppression of transients with very small external
capacitors; integrated flyback path
° Permanent shutdown with excessive temperature and
overcurrent (i.e. if the laser diode is damaged or the
feedback current path fails)
° Two feedback inputs permit all current LD types to be used
(M/P/N configurations)
° Modulation via the feedback inputs is possible
° Wide monitor current range from 10µA to 2.5mA
Rev C2, Page 1/7
APPLICATIONS
° Battery-powered LD modules
° LD Pointers
° Bar-code readers
PACKAGES
SO8
MSOP8
BLOCK DIAGRAM
+2.4..+6V
6 VCC
CVCC
...47nF...
TRANSIENT
PROTECTION
iC-WKL
1
D
LDA 7
CLDA
..1µF..
MDK 4
- MDA 5
+
VREF
0.5V
CI 2
LDK 8
MD LD
NQ
R
GND
RGND 1
0..3
GND
OVER CURRENT/
OVER TEMP.
iC-WK
FEEDBACK MON.
AGND 3
CI RM
200 ..50k
..100nF..
CM
47pF
suitable laser diode configurations: N, P, M
MD LD
MD LD
LD
MD
© 2002
iC-Haus GmbH
Integrated Circuits
Am Kuemmerling 18, D-55294 Bodenheim
Tel +49-6135-9292-0
Fax +49-6135-9292-192
http://www.ichaus.com



iC-Haus
iC-Haus

iC-WKL Datasheet Preview

iC-WKL Datasheet

2.4V CW LASER DIODE DRIVER

No Preview Available !

iC-WKL pdf
iC-WK, iC-WKL
2.4V CW LASER DIODE DRIVER
Rev C2, Page 2/7
DESCRIPTION
The iC-WK/L device is a driver for laser diodes in continuous wave operation which requires only four external
components. The wide power supply range of 2.4V to 6V and the integrated reverse battery protection allow
for battery operation with a minimum of two cells. A reversed battery connection destroys neither the iC nor
the laser diode.
The iC includes integrated circuitry protecting against destruction by ESD, excessive temperature and over-
current and a soft start which regulates the power and protects the laser diode when the power supply is
switched on. The iC also filters the laser diode power supply for transients.
The power supply is regulated and adapted for the laser diode used by an external resistor at MDA. The
monitor current acts as a reference and is regulated independent of the influence of temperature and supply
voltage (range: 10µA to 2.5mA). The capacitor at CI determines the recovery time constants and start-up time.
A second monitor input, pin MDK, allows the driver to be used for other types of laser diode configuration;
alternatively, it can be used as an analog modulation input (DC to a few kHz).
In the event of failure, such as overcurrent in the laser path with a lack of feedback, for example, a quick
power lockout is activated. The shutdown continues until power is reapplied, permitting a restart. The strain
on power packs and batteries is relieved and the laser class is retained even in the event of a disturbance.
IC-WK offers additional protection by means of spike detection at pin MDA. Should spike or oscillation occur
at pin MDA the power lockout is activated.
PACKAGES SO8, MSOP8 to JEDEC Standard
PIN CONFIGURATION SO8
(top view)
PIN CONFIGURATION MSOP8 (3mm)
PIN FUNCTIONS
No. Name Function
1 GND Ground
2 CI Capacitance for Power Control
3 AGND Reference Ground for CI, RM
4 MDK Monitor Input 2
(MD Cathode, modulation)
5 MDA APC Setup, Monitor Input 1
(MD Anode)
6 VCC +2.4 .. +6V Supply Voltage
7 LDA Laser Supply (LD Anode)
8 LDK Driver Output (LD Cathode)


Part Number iC-WKL
Description 2.4V CW LASER DIODE DRIVER
Maker iC-Haus
Total Page 7 Pages
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