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3

Analog Technologies

ATLS100MA104

Low Noise Constant Current Laser Controller

SPECIFICATIONS

°C)

Parameter

Value

Unit/Note

Maximum Output Current

100

mA

Peak-to-Peak Noise

3.96

Current Noise Density

0.6

Current Set Voltage Range

0 ~ 2.5

V

Current Limit Set Voltage

0 ~ 2.75

V

Rise and Fall Times of large

signal

75

nS

Rise and Fall Times of small

signal

46

nS

Bandwidth of large signal (0.2V

~ 2.2V square wave)

4.67

MHz

Bandwidth of small signal (1V

DC plus 200mV AC square

wave)

7.61

MHz

Minimum Drop Out Voltage

0.9 +

5

V

Power Supply Voltage Range

3.1 ~ 5.5

V

Operating Case Temperature

−40 ~ 85

°C

Storage temperature

−55 ~ 150

°C

(T =

−30ºC ~ 60ºC)

<±0.5

mA

can be made of 1 to 5 diodes)

<±0.5

mA

Figure 3. Input Control

OPERATION PRINCIPLE

The block diagram of the controller is shown in Figure 4.

The shutdown 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 4. Block Diagram