ic-wjb iC-Haus, ic-wjb Datasheet

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ic-wjb

Manufacturer Part Number
ic-wjb
Description
2.7 V Laser Diode Driver
Manufacturer
iC-Haus
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-wjb Summary of contents

Page 1

... V LASER DIODE DRIVER FEATURES Simple APC adjustment via an external resistor Continuous (CW) or pulsed operation 300 kHz Laser diode current 100 mA Adjustable watchdog for input signals Soft power-on and thermal protection Driver shutdown in case of overtemperature and undervoltage Operation at 2 with two to four AA/AAA cells ...

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

... V LASER DIODE DRIVER ABSOLUTE MAXIMUM RATINGS Beyond these values damage may occur; device operation is not guaranteed. Item Symbol Parameter No. G001 VCC Supply Voltage VCC G002 VCC Reverse Voltage at VCC G003 I(VCC) Current in VCC G004 I(CI) Current in CI G005 V(KLD) Voltage at KLD ...

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

... 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. 405 Vs(CI)wd Saturation Voltage at CI with 406 Isc(CWD) Pull-Up Current at CWD 407 tpmin Min. Activation Time for Watchdog (*) ...

Page 6

... V LASER DIODE DRIVER APPLICATIONS INFORMATION Laser Power Adjustment The iC-WJB device can be adapted to CW laser diodes mW. When the supply voltage is higher than approx. 4 models in common cathode configu- ration can be used. REFERENCE 4 ISET RSET 24kΩ INPUT ...

Page 7

... V LASER DIODE DRIVER CR1 V (ISET ) 3 1.22 V RSET = = I (AMD) av with the Electrical Characteristics No. 301 for V(ISET) and No. 108 for current ratio CR1. Averaging control (APC) The control of the average optical laser power requires a capacitor at pin CI. This capacitor is used for aver- aging and must be adjusted to the selected pulse rep- etition frequency and the charging current preset with RSET ...

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

... V LASER DIODE DRIVER Furthermore, the introduction of the watchdog permits long pulse pauses and activation of the laser diode with pulse packets. 2.7..6V S1 GND 1 2 CWD CI WDOG 100nF 3 CI REF RSET 15kΩ 4 ISET iC−WJB Figure 10: CW operation via cable plus protective circuitry ...

Page 10

... V LASER DIODE DRIVER GND 22nF 3 RSET 27kΩ 4 VMOD R3 0..1.3V 27kΩ Figure 11: Analogue modulation during CW operation Analogue modulation during CW operation The modulation cut-off frequency is determined by the capacitor CI as well as by the operating point set with the resistor RSET. With CI = 100 nF and RSET = the cut-off frequency is approx ...

Page 11

... V LASER DIODE DRIVER VCC IN GND RMOD IMOD 15kΩ CWD ....... AGND Figure 12: Schematic diagram of the Demo Board This specification is for a newly developed product. iC-Haus therefore reserves the right to change or update, without notice, any information contained herein, design and specification; and to discontinue or limit production or distribution of any product versions. Please contact iC-Haus to ascertain the current data. ...

Page 12

... 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.ichaus.com E-Mail: sales@ichaus.com http://www.ichaus.de/support_distributors.php Rev E1, Page 12/12 Order Designation iC-WJB SO8 iC-WJB MSOP8 iC-WJB EVAL WJ1D ...

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