iC-WJ, iC-WJZ

LASER DIODE DRIVER

Rev C1, Page 1/12

FEATURES

o Laser diode driver for continuous and pulsed operation (CW to

300 kHz) up to 250 mA

o Averaging control of laser power

o Simple adjustment of the laser power via external resistor

o Adjustable watchdog at the switching input to protect the laser

diode

o Soft-start after power-on

o Driver shutdown with overtemperature and undervoltage

o Single 5 V supply

o Simple circuitry

o iC-WJ for laser diodes with 50 to 500 µA monitor current

o iC-WJZ for laser diodes with 0.15 to 1.5 mA monitor current

APPLICATIONS

o General purpose laser diode

driver

PACKAGES

SO8

MSOP8

BLOCK DIAGRAM

+5 V

100

µF

C1

DRIVER STAGE

INPUT

POWER DOWN

THERMAL

WATCHDOG

REFERENCE

REF

VCC

REF

1

2

3

4

100 nF..470 nF

CI

CWD

RSET

10 k

Ω

74HCxx

KLD

VCC

CI

CWD

IN

GND

ISET

AMD

usable LD models

MD

LD

SHUTDOWN

iC−WJ/WJZ

1:1 iC−WJ

1:3 iC−WJZ

R1

12

Ω

C3

2 nF

5

8

7

1

3

2

6

4

Copyright © 2006 iC-Haus

http://www.ichaus.com