1161 Ringwood Ct, #110, San Jose, CA 95131, U. S. A. Tel.: (408) 748-9100, Fax: (408) 770-9187

www.analogtechnologies.com

Copyrights 2000-2022, Analog Technologies, Inc. All Rights Reserved. Updated on 1/17/2022

Email: staff@analogti.com/sales@analogti.com

2

Analog Technologies

ATLS200MA103

Low Noise Constant Current Laser Controller

3

2.5VR

Analog output

2.5V reference voltage. It is used by the internal DACs as the reference voltage. It can

source 3mA max, with 5

μVp-p noise @ 0.1Hz to 10Hz and 25ppm/°C stability max.

4

LILM

Analog input

Laser current limit set. 0V to 2.5V sets the laser current limit from 0 to 220mA linearly.

5

LIS

Analog input

Laser current set. 0V to 2.5V sets the laser current from 0 to 200mA linearly.

6

LIO

Analog output

Laser current output indication. 0V to 2.5V indicates the laser current from 0A to 200mA

linearly.

7

LPGD

Digital output

Loop good indication. When the controller is working properly, this pin is pulled high.

Otherwise, it is pulled low.

8

TMPO

Analog output

The driver internal temperature indication output. Operating internally temperature.

9

LDA

Analog output

Laser diode anode. Connect it to the anode of the laser diode. This pin is used to drive a

laser of which the cathode is connected to the case and the case is connected to the ground.

10

LDC

Analog output

Laser diode cathode. Only connect to the cathode of the laser diode. See below Figure 4.1,

4.2 or Figure 7.

11

PGND

Power ground

Power ground pin. Connect it directly to power supply return rail.

12

VPS

Power input

Power supply. The driver works from 3.8V to 5.5V.

SPECIFICATIONS

°C)

Parameter

Value

Unit

Maximum output current

200

mA

Output current noise

(0.1Hz to 10Hz)

≤2.5

Current set voltage range

0 ~ 2.5

V

Current limit set voltage range

0 ~ 2.5

V

Minimum drop out voltage

V

Power supply voltage range

3.8 ~ 5.5

V

shut down logic voltage threshold

voltage

0.5~1.3

V

Operating case temperature

−40 ~ 85

°C

Bandwidth of large signal

1

MHz

Bandwidth of small signal

1.2

MHz

Rise and fall times of small signal

300

nS

Rise and fall times of large signal

170

nS

OPERATION PRINCIPLE

The block diagram of the controller is shown in Figure 3.

The shut down control circuit is activated under one of these

3 circumstances: external shut down, output current exceeds

the current limit, and the internal temperature exceeds

120

°C.

When the controller is shut down by the external shutdown

signal, it will restart upon detecting the releasing of the

shutdown signal.

When it is shut down by the over current limit, the controller

shuts down itself and restarts again by going through the

soft-start process immediately. Therefore, the output current

has a saw-tooth waveform: quick shut down, slow and ramp up.

When the controller is shut down by the over temperature, it

will wait till the temperature goes below the temperature limit,

120

°C. Usually it takes a few or tens of seconds for the

controller to cool down before it restarts itself, depending on

the thermal mass of the controller and its surrounding

mechanical parts attached thermally, such as the PCB and its

traces, the heat-sinks if any, etc.

When controller is shut down, the voltage reference is also shut

down.

TMPO

Laser

Diode

8

10

5

LDC

LIS

Shut-

down

& soft-

start

circuit

Current

sensor &

low noise

driver

Voltage

reference

12

3

2

1

LISL

GND

SDN

10pF

100K

Ω

VPS

11

PGND

4

6

LIO

LILM

LPGD

7

Temp.

sensor

9

LDA

Current

limiter

Figure 3. Block Diagram

Note: The Pin 7, LPGD, is pulled down by an open drain

MOSFET and pulled up by a 5k resistor tied to VPS rail.

2.5VR