CWD-01-V2-D Analog Technology, Inc., CWD-01-V2-D Datasheet - Page 4

• Manufacturer Part Number: CWD-01-V2-D
• Description: Constant Current Cw Laser Driver
• Manufacturer: Analog Technology, Inc.

V
V
η = I_output × V
When the P_controller exceeds 1W, a heat sink might be
needed. Under this situation, if prefer not to use the heat
sink, this is an option: lowering the controller power
consumption by reducing the power supply voltage V
Please make sure:
V
where V_laser_diode_max is the maximum possible laser
diode voltage.
First Time Power Up
Laser is a high value and vulnerable device. Faults in
5 50 E. Weddell Drive, Suit e 4, Sunnyvale, CA 94 08 9, U. S. A. Tel.: (4 08 ) 7 47 -9 76 0, Fax: [phone] , W eb: w w w .analogt echnologies.com
 Copyrights 2000 – 2009, Analog Technologies, Inc. All Rights Reserved. Updated on 9/15/2009
PS
LDA
PS
is the power supply voltage;
≥ V_laser_diode_max + 0.15 V
is the voltage across the laser diode;
Analog Technologies
LDA
/(I_input × V
PS
).
PS
,
PS
.
Constant Current CW Laser Driver
connections and damages done to the controller during
soldering process may damage the laser permanently.
To protect the laser, it is highly recommend to use 3 to 4
regular diodes of >2A to form a “dummy laser” and
insert it in the place of the real laser diode, when
powering up the controller for the first time. Use an
oscilloscope to monitor the LDA voltage at times of
power-up and power-down, make sure that there is not
over-shoot in voltage. At the same time, use an ammeter
in serious with the dummy laser, to make sure that the
output current is correct.
After thorough checking free of faults, disconnect the
dummy laser and connect the real laser in place.
The controller output voltage range for the laser is between
0.5 to 4V when powered by a 5V power supply.
CWD-01-V2-D
4