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2

Analog Technologies

ATLS500MA106

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

4

LIMS

Analog input

Laser current limit set. 0V to 2.5V sets the laser current limit from 0 to 600mA linearly.

5

LIS

Analog input

Laser current set. 0V to 2.5V sets the laser current from 0 to 500mA linearly.

6

LIO

Analog output

Laser current output indication.0.1V to 2.5V indicates the laser current of from 0A to

500mA linearly.

7

LPGD

Digital output

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

by a 4.99k resistor connected to the VPS rail. Otherwise, it is pulled low by an open

drain MOSFET, which has the Rdson of < 100

Ω.

8

TMPO

Analog output

The driver internal temperature indication output.

9

LDA

Power output

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

the type of diode laser of which the cathode is connected to its case and the case is

connected to the ground. See below Figure 4 or Figure 5.

10

LDC

Power output

Laser diode cathode. Connect it directly to the laser’s cathode. See below Figure 4 or

Figure 5.

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 3.0V to 5.5V.

SPECIFICATIONS

°C)

Parameter

Value

Unit/Note

Maximum Output Current

500

mA

Output Current Noise

(RMS) @ 0.1Hz ~ 10Hz

4.5

Current Set Voltage Range

(LIS)

0 ~ 2.5

V

Current Limit Set Voltage

Range (LIMS)

0 ~ 2.5

V

Bandwidth

200

kHz

Minimum Drop Out Voltage

0.3 +

2.1

V

Power Supply Voltage Range

3.0 ~ 5.5

V

Operating Case Temperature

−40 ~ 85

°C

Rise and Fall Times

1.5

μS

<0.1%

<100

ppm/

°C

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.

Figure 3. Block Diagram