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iC-WKL Schematic ( PDF Datasheet ) - iC-Haus

Teilenummer iC-WKL
Beschreibung 2.4V CW LASER DIODE DRIVER
Hersteller iC-Haus
Logo iC-Haus Logo 




Gesamt 7 Seiten
iC-WKL Datasheet, Funktion
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-WKL Datasheet, Funktion
iC-WK, iC-WKL
2.4V CW LASER DIODE DRIVER
Rev C2, Page 6/7
DESCRIPTION OF FUNCTIONS
Turn-on behaviour
5.0V
After switching on the supply voltage the output stage
remains disabled until the internal enabling flip-flop is 0V
V(VCC)
set by a sufficiently high voltage at LDA.
5.0V
V(LDA)
A quick soft start occurs during phase I; the control 0V
capacitor CI is loaded at an accelerated rate until the 200µA
output stage supplies current at LDK. An open-circuit
-I(MDA)
voltage at pin MDA is used to verify the external 0µA
resistance.
0.6V
V(MDA)
Phase 2, the initialization process, begins when current 0V
starts to flow at LDK. This phase ends when the laser 2.0V
reaches its threshold current and the monitor current
V(CI)
produced raises the potential at resistor RM.
0V
Phase I
Phase II
Phase III
60mA
The transition to CW operation (phase 3) is gradual and
I(LDK)
primarily influenced by the CI and RM components. CI is 0mA
properly dimensioned when the voltage overshoot at
0s
MDA is at a minimum.
10µs
20µs
30µs
40µs
t
Fig. 1: Turn-on behaviour
50µs
Turn-off behaviour
5.0V
iC-WK/L functions without a fixed undervoltage lockout,
V(VCC)
0V
thus the laser diode forward voltage is the prime factor
determining the lowest possible supply voltage.
5.0V
V(LDA)
If the voltage drops below this, the output stage is 0V
forcibly saturated and the laser current falls. In this 200µA
instance iC-WK/L simultaneously discharges control
-I(MDA)
capacitor CI so that no excessive laser diode currents 0µA
occur when the supply voltage rises again.
0.6V
V(MDA)
0V
Disruptions in operation
2.0V
Phase IV Phase V
The power control is shut down with excessive driver
V(CI)
temperature or when the laser current reaches the 0V
overcurrent shutdown threshold, for example when the 60mA
feedback is interrupted. If the monitor diode or the
I(LDK)
preset resistor RM fail, the device is shutdown in less
0mA
100µs
150µs
than 250µs, provided that the supply voltage applied is
200µs
250µs
high enough. When modulating or switching the laser
Fig. 2: Turn-off behaviour
current via pin MDK (see Application Notes), excessive
Voltage occurring at pin MDA also causes a shut down (iC-WK only).
300µs
t

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