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Analog Technologies

Low Noise Constant Current Laser Controller

ATLS200MA103

Figure 15.1 Transferring Heat with Metal Enclosure

Figure 15.2 Transferring Heat with Heat Sink

First Time Power Up

Laser is a high value and vulnerable device. Faults in

connections and damages done to the controller during

soldering process may damage the laser permanently.

To protect the laser, it is highly recommend to use 1 to 2

regular diodes of >200mA to form a “dummy laser” and insert

it in the place of the real laser diode, when powering up the

controller for the first time. Use an oscilloscope to monitor

the LDA voltage at times of power-up and power-down, make

sure that there is not over-shoot in voltage. At the same time,

use an ammeter in series with the dummy laser, to make sure

that the output current is correct.

After thorough checking free of faults, disconnect the dummy

laser and connect the real laser in place.

The controller output voltage range for the laser is between