2

iC-WK, iC-WKL

2.4 V CW LASER DIODE DRIVER

Rev D2, Page 2/10

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 2.4 to 6 V and the integrated reverse battery protec-

tion 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 to 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 sup-

ply voltage (range: 10 µA to 2.5 mA). The capacitor at

CI determines the control 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; al-

ternatively, it can be used as an analogue 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 con-

tinues 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 spikes or oscillation

occur at pin MDA the power lockout is activated.

PACKAGING INFORMATION SO8, MSOP8 to JEDEC

PIN CONFIGURATION SO8

1 2 3 4

5

6

7

8

<P-CODE>

<A-CODE>

<P-CODE>

PIN CONFIGURATION MSOP8

1

2

3

4

5

6

7

8

<P-CODE>

<A-CODE>

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 to +6 V Supply Voltage

7 LDA

Laser Supply (LD Anode)

8 LDK

Driver Output (LD Cathode)

Do not short-circuit pins AGND and GND, for this may

deteriorate the precision of the regulator and interfere

with the soft-start!

Laser

Diodes

Germany & Other Countries

Laser Components GmbH

Tel: +49 8142 2864 – 0

Fax: +49 8142 2864 – 11

info@lasercomponents.com

www.lasercomponents.com

France

Laser Components S.A.S.

Tel: +33 1 39 59 52 25

Fax: +33 1 39 59 53 50

info@lasercomponents.fr

www.lasercomponents.fr

United Kingdom

Laser Components (UK) Ltd.

Tel: +44 1245 491 499

Fax: +44 1245 491 801

info@lasercomponents.co.uk

www.lasercomponents.co.uk

Nordic Countries

Laser Components Nordic AB

Tel: +46 31 703 71 73

Fax: +46 31 703 71 01

info@lasercomponents.se

www.lasercomponents.se