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Analog Technologies, Inc.
2352 Walsh Ave.
Santa Clara, CA 95051
U. S. A

Tel.: 408-748-9100
Fax: 408-748-9111

New Website: www.analogti.com

Online Store: www.smtzone.com

Design Note

pdf file:How to Choose a Laser Driver


How to Choose a Laser Driver

When designing a diode laser, the 2nd things to do after selecting the laser diode is to choose a laser driver. Here are some suggestions:
1. If the laser diode requires a minimum current of > 1A, most likely, a switch mode laser driver is needed, provided that the high frequency ripple noise, at about 500KHz, is not a problem for the optical system. The main advantage of the switch mode laser driver is that it has a high efficiency, thus producing less heat. The main shortcoming of this type of laser driver is that it has a high ripple noise, about 0.1% to 1% of its output current.
2. If the laser diode current required is about 1A or even less, a linear mode laser driver can be considered using. The advantage of this type of laser driver is that it has a low noise, but the main shortcoming is: low efficiency, thus produces more heat than the switch mode laser driver. For small output current, < 500mA, the heat won't be a problem. For high current, such as 1A, heat sinking mechanisms is a must.
3. We have a full line laser drivers, below is the selection guide:


Part #

Input Voltage
Range

Maximum
Output Current

Output Voltage Range

Unit Price@100pcs

AAS20A5V

88VAC~264VAC

20A

0V~5V

$220

AAS30A5V1

88VAC~264VAC

30A

0V~5V

$230

AAS40A3.5V2

88VAC~264VAC

40A

0V~3.5V

$250

AAS45A3.5V1

88VAC~264VAC

45A

0V~3.5V

$250

AAS6V40A1

88VAC~132VAC or 176VAC~264VAC

40A

1V~6V

$178

AAS6V40A2

88VAC~132VAC or 176VAC~264VAC

40A

1.3V~6V

$205.2

4. After selecting the laser driver, PCB layout has to be carefully done, if using the DC input type laser drivers. The guidance about laying out the PCB for the laser driver can be found in the laser drivers' datasheet. For the AC input laser drivers, there is no need to do any PCB layout.