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Analog Technologies

Low Noise Constant Current Laser Controller

ATLS500MA103

Figure 15.2 Transferring Heat with Metal Enclosure

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 3 to 4 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.

Figure 16. Controller Internal Temperature vs. TMPO Voltage

–20 –10

0

10

20

30

40

50

60

70

80

90

100

110

120 130

140

150

0.4

0.8

1.2

1.6

2.0

2.4

Voltage (V)

Temperature (°C)

A Linearized TMPO Voltage vs. Controller Temperature

Actual TMPO Voltage vs. Controller Temperature