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

CWD-01-V2-D

Manufacturer Part Number

CWD-01-V2-D

Description

Constant Current Cw Laser Driver

Manufacturer

Analog Technology, Inc.

Datasheet

1.CWD-01-V2-D.pdf (6 pages)

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FEATURES

High Efficiency: ≥90%

Constant Current Output

Maximum Output Current: 2A

Current Output Noise: 0.05%

High Stability: 100ppm/°C

Zero EMI

Compact Size

DIP Package Available

APPLICATIONS

Drive laser diodes with low noise, including DPSSL, EDFA,

fiber laser, direct diode lasers, etc.

DESCRIPTION

This laser driver is an electronic module designed for

driving diode lasers with up to 2A constant current, high

efficiency, low noise, high reliability, zero EMI, and small

package. Figure 1 shows physical photo of CWD-01-V2-D.

It provides these the functions: laser constant current control,

laser current monitoring, over current and thermal protection,

laser current control indication, laser diode status indication,

soft start, and shut down.

It comes with a high stability low noise 2.5V voltage

reference output which can be used for setting the output

current. The reference output can also be used for the ADCs

(Analog to Digital Converters) and/or DACs (Digital to

Analog Converters).

Table 1 Pin Function Descriptions

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: (40 8) 74 7-97 70 , W eb: w w w .analogt echnologies.com

Pin #

3, 7

Analog Technologies

LDGD

2.5VR

Name

LIGD

GND

SDN

LIO

LIS

Signal Ground

Analog Output

Digital Output

Analog Input

Digital Input

Type

Shut down control. Negative logic, at the internal chip control input: >1.4V

= enable, <0.95V = shut down, normal threshold voltage = 1.2V.

Laser diode good. When this pin is high, >2V, the control loop is working

properly. When this pin is low, <0.3V, the laser diode is bad, or there is a

short or open circuit at the laser diode.

Signal ground pin. Connect ADCs and DACs grounds to here.

Reference voltage. It can source 3mA max, with 5μVp-p noise @ 0.1 to 10

Hz and 25ppm/°C stability max.

Laser current set-point voltage. There is an input resistor of 100K tied to

GND. Setting it from 0V to 2.5V will set the laser current from 0A to 2A

linearly.

Laser current output indication. 0V to 2.5V indicates the laser current of

from 0A to 2A linearly.

Laser current good, control loop indication. When this pin is stabilized and

the value is between 0.2V and 1.8V, the output voltage to the laser, Pin 9

LDA, will be 4.8V to 0V linearly, the laser current is stabilized, and the

control loop is stable. This pin has a similar function as Pin 2 LDGD,

Constant Current CW Laser Driver

The CWD-01-V2-D is packaged in a 6 sided metal enclosure,

which blocks EMIs (Electro-Magnetic Interferences) to prevent

the controller and other electronics from interfering each other.

Figure 2 is the actual size top view of the CWD-01-V2-D,

which shows the pin names and locations. Its thickness is

5.0mm.

The CWD-01-V2-D pin functions are shown in Table 1.

Figure 1 Physical photo of CWD-01-V2-D

Figure 2 Pin Names and Locations

LDGD

2.5VR

GND

SDN

LIO

LIS

Description

20.0

CWD-01-V2-D

VPS

PGND

LDA

LIGD

GND

25.8

Related parts for CWD-01-V2-D

CWD-01-V2-D Summary of contents

Page 1

... The CWD-01-V2-D is packaged sided metal enclosure, which blocks EMIs (Electro-Magnetic Interferences) to prevent the controller and other electronics from interfering each other. Figure 2 is the actual size top view of the CWD-01-V2-D, which shows the pin names and locations. Its thickness is 5.0mm. ...

Page 2

... Laser 2.5V Soft start diode voltage & thermal status reference shutdown indication Constant EA current driver Laser current control indication Over current Current protection measurement Figure 3 Block Diagram CWD-01-V2-D LDGD 2 PGND 10 LDA 9 Laser diode 2 ...

Page 3

... LIO can be used to drive an ADC directly, and also be measured by a multimeter during debugging process. Controller Power Consumption The power consumption of the controller can be calculated by: P_controller = I_input × V where I_output is the output current; I_input is the power supply intput current; CWD-01-V2-D /2.5 (A). LIS CWD-01-V2 SDN VPS 2 11 LDGD PGND 3 10 ...

Page 4

... 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 when powered power supply. CWD-01-V2-D 4 ...

Page 5

... E. Weddell Drive, Suit e 4, Sunnyvale Tel Fax .analogt echnologies.com  Copyrights 2000 – 2009, Analog Technologies, Inc. All Rights Reserved. Updated on 9/15/2009 Constant Current CW Laser Driver CWD-01-V2-D See Figure 8 and recommended to use large copper fills for VPS, PGND, and the LDA pins, and ...

Page 6

... E. Weddell Drive, Suit e 4, Sunnyvale Tel Fax .analogt echnologies.com  Copyrights 2000 – 2009, Analog Technologies, Inc. All Rights Reserved. Updated on 9/15/2009 Constant Current CW Laser Driver Description It can output current and is packed in DIP package. 10 − − 199 $68 CWD-01-V2-D ≥200 $58 $48 6 ...

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