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1

Analog Technologies

ATLS3A202D

Constant Current Laser Driver

Figure 1. Photo of Actual ATLS3A202D

FEATURES

High Efficiency:

≥90%

Constant Current Output

Maximum Output Current: 3A

High Stability: 100ppm/

°C

PWM Switching Frequency Synchronizable

Zero EMI

Compact Size

100 % Lead (Pb)-free and RoHS Compliant

DIP Package Available

APPLICATIONS

Driving 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 3A constant current, high

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

package. Figure 1 shows the photo of actual ATLS3A202D.

It provides these functions: laser constant current control,

laser current monitoring, over current and thermal protection,

switching frequency synchronization, 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) to monitor the laser output current and/or set laser

output current respectively.

The frequency synchronization of this laser driver allows using

an external digital signal to synchronize the internal PWM

output stage of the laser driver, to eliminate frequency beating

interferences between the laser drivers and other switch mode

electronic circuits on the same PCB.

The external signal needs to be in the range of 520kHz to

800kHz.

If other frequency is needed, contact us, we may be able to

adjust the internal PWM frequency for you. The default

switching frequency of the internal PWM output stage is

500kHz.

the

board

by

using

a

solder

iron

of

< 310ºC (590ºF), never let the module go

through a reflow oven process.

The ATLS3A202D is packaged in a 6 sided metal enclosure,

which blocks EMIs (Electro-Magnetic Interferences) to prevent

the driver and other electronics from interfering with each

other.

Figure 2. Pin Names and Locations

Figure 2 is the actual size top view of the ATLS3A202D,

which shows the pin names and locations. Its thickness is

5.0mm.

The ATLS3A202D pin functions are shown in Table 1.

Table 1 Pin Function Descriptions

Pin #

Name

Type

Description

1

SDN

Digital Input

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

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

2

SYNC

Synchronization

Input

The default internal switching frequency is 500kHz. This pin can be connected to an

external clock signal of which the frequency should be about 10% to 15% higher than

the default switching frequency. In this way, the driver will be switching at the same

frequency with the external clock signal, eliminating beating interferences with other

2.5VR

25.8

VPS

PGND

LDC

LDA

LDGD

GND

SYNC

GND

LIS

LIO

SDN

1

3

4

5

6

2

12

10

9

8

7

11

20.0