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1

Analog Technologies

ATLS3A201D

Constant Current Laser Driver

FEATURES

∼ 6V

≥ 90%

∼ 10Hz

± 8mA@3A for entire temperature

APPLICATIONS

Driving laser diodes in DPSSL, EDFA, fiber laser, direct

diode laser, etc., with low noise and high efficiency.

DESCRIPTION

This laser driver, ATLS3A201D, is an electronic module

designed for driving diode lasers by an up to 3A constant

current with high efficiency, low noise, high stability, high

reliability, zero EMI, and small package. Figure 1 shows the

physical photo of the ATLS3A201D.

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. This voltage can be used by a POT

(Potentiometer), or a DAC (Digital to Analog Converter) to

set the voltage on the LIS pin for programming the output

current, and, at the same time, by an ADCs (Analog to

Digital Converters) to measure the voltage on the LIO pin

for monitoring the output current.

on the board by a solder iron at < 310ºC (590ºF), it

cannot go through a reflow oven process.

Figure 1. Photo of Actual ATLS3A201D

The ATLS3A201D 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 real size top view of the ATLS3A201D, which

also shows the pin names and locations. Its thickness is 5mm.

The pin functions are described in Table 1 below.

Table 1 Pin Function Descriptions

Pin #

Name

Type

Description

1

SDN

Digital Input

ATLS3A201D: Shut down control. Negative logic, at the internal chip control

input: >1.4V = enable, <0.95V = shut down.

ATLS3A201D-PD: Shut down control. Positive logic, at the internal chip control input:

<0.95V = enable, >1.4V = shut down. There is a pull-down resistor of 55k to the ground.

2

LDGD

Digital Output

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.

3, 7

GND

Signal Ground

Signal ground pin. Connect the POT, DAC and/or the DAC grounds to here.

2.5VR

25.8

VPS

PGND

LDC

LDA

LIGD

GND

LDGD

GND

LIS

LIO

SDN

1

3

4

5

6

2

12

10

9

8

7

11

20.0