IC-WJBEVALWJ1D ICHAUS [IC-Haus GmbH], IC-WJBEVALWJ1D Datasheet

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IC-WJBEVALWJ1D

Manufacturer Part Number
IC-WJBEVALWJ1D
Description
2.7 V LASER DIODE DRIVER
Manufacturer
ICHAUS [IC-Haus GmbH]
Datasheet
Copyright © 2008 iC-Haus
iC-WJB
2.7 V LASER DIODE DRIVER
FEATURES
BLOCK DIAGRAM
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
RSET
2.7..330kΩ
6
4
ISET
IN
INPUT
REFERENCE
CWD
(..pF)
CWD
2
REF
VCC
REF
POWER DOWN
WATCHDOG
THERMAL
SHUTDOWN
CI
470nF
CI
3
iC−WJB
1
DRIVER STAGE
GND
1
3
AMD
VCC
KLD
PACKAGES
APPLICATIONS
Battery supplied LD modules
LD Pointers
5
8
7
SO8
0..2Ω
R1
C3
2nF
alternative LD model
(VCC > 4.5 )
LD
LD
MD
Rev E1, Page 1/12
C1
47uF
http://www.ichaus.com
MD
MSOP8
D1
Z6V8
R2
2Ω
2.7..6V
VB

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IC-WJBEVALWJ1D Summary of contents

Page 1

... Operation at 2 with two to four AA/AAA cells Protection against reverse polarity BLOCK DIAGRAM REF REFERENCE RSET 2.7..330kΩ ISET 4 INPUT IN 6 CWD 2 CWD (..pF) Copyright © 2008 iC-Haus DRIVER STAGE THERMAL SHUTDOWN VCC POWER DOWN REF 1 WATCHDOG iC−WJB CI GND 3 CI 470nF Rev E1, Page 1/12 ...

Page 2

... V LASER DIODE DRIVER DESCRIPTION The iC-WJB device is a driver IC for laser diodes in continuous or pulsed operation 300 kHz. The wide power supply range of 2 and the inte- grated reverse battery protection allows for battery- operation with two to four AA/AAA cells. ...

Page 3

... T02 Rthja Thermal Resistance Chip to Ambient All voltages are referenced to ground unless otherwise stated. All currents into the device pins are positive; all currents out of the device pins are negative. Conditions T < < ...

Page 4

... V LASER DIODE DRIVER ELECTRICAL CHARACTERISTICS Operating Conditions: VCC = 2.7...6 V, RSET = 2.7... I(AMD) = 0.15...1.5 mA -25...125 °C, unless otherwise noted. Item Symbol Parameter No. Total Device 001 VCC Permissible Supply Voltage Range 002 Idc(VCC) Supply Current in VCC 003 I0(VCC) Standby Supply Current in VCC ...

Page 5

... Min. Activation Time for Watchdog (*) 408 Constant for Calculating the Kwd Watchdog Activation Time (*) tp = (C(CWD) Kwd) + tpmin (see Applications Information) Conditions (*) I(CI) = 300 µA, t(IN = lo) > tp V(CWD lo, CWD open ° °C Rev E1, Page 5/12 Unit Min. Typ. ...

Page 6

... The pin ISET is used for the adjustment to the sensi- tivity of the monitor diode and to set the desired optical laser power. The setpoint for the averaging control of the monitor diode current is pre-set at this pin. ...

Page 7

... The capacitor CI is correctly dimensioned when the current through the laser diode and the optical output signal do not show any overshots following the rising edge. In steady-state condition and for a pulse duty factor (pulse / pause = 1:1), wave forms as shown in Figure 3 ...

Page 8

... V LASER DIODE DRIVER laser pulses indicate that the undervoltage detector is active. 2.55 V 2.45 V I(KLD Figure 6: Turn-on behaviour, detailed view f(IN) = 100 kHz (1:1 470 nF, RSET = 10 k 5.0 V VCC 0 V 3.0 V V(CI Figure 7: Turn-off behaviour, f(IN) = 100 kHz (1:1 470 nF, RSET = 10 k Watchdog The watchdog ensures that the capacitor CI is dis- charged during protracted pulses at IN ...

Page 9

... VCC nances of the load circuit caused by the inductive LD supply line. This resistor is useful for many applica- tions, also for those which do not operate via cable PCB the forward path VCC to the laser diode should be arranged in parallel with the return path to KLD even when the line is only a few centimeters in length ...

Page 10

... ISET must be taken into consideration when dimensioning the capacitor CI. PC board layout The ground connections of the external components CI, CWD and RSET have to be directly connected at the IC with the GND terminal. the schematic diagram and the component side of the test PCB. Rev E1, Page 10/12 C1 47uF C3 ...

Page 11

... In principle the range of use is limitless in a technical sense and refers to the products listed in the inventory of goods compiled for the 2008 and following export trade statistics issued annually by the Bureau of Statistics in Wiesbaden, for example any product in the product catalogue published for the 2007 and following exhibitions in Hanover (Hannover-Messe) ...

Page 12

... V LASER DIODE DRIVER ORDERING INFORMATION Type Package iC-WJB SO8 MSOP8 WJB Evaluation Board For technical support, information about prices and terms of delivery please contact: iC-Haus GmbH Am Kuemmerling 18 D-55294 Bodenheim GERMANY Appointed local distributors: Tel.: +49 (61 35) 92 92-0 Fax: +49 (61 35) 92 92-192 Web: http://www ...

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