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Analog Technologies

ATLS25A219D

32V 25A Constant Current Laser Driver

Figure 13.2 Transferring Heat with Heat Sink

First Time Power Up

Laser diode is a high value and vulnerable device. Faults in

connections and damages done to the driver during soldering

process may damage the laser diode permanently. To protect

the laser diode, it is highly recommend to use 3 to 18 regular

diodes which is >15A to form a “dummy laser” and insert it

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

driver for the first time. Use an oscilloscope to monitor the

LDA voltage at times of powering up and enabling the

shutdown pin, and powering down the laser driver and

turning off the shutdown pin, and make sure that there is not

over-shoot output voltage at the LDA pin. At the same time,

it uses an ammeter in serious with the dummy laser, to make

sure that the output current is correct. After thoroughly

checking and making sure of free of faults in the system,

disconnect the dummy laser diode and connect the real laser

diode in place. The driver output voltage range for the laser

types of packages can only be soldered manually on the

board by a solder iron of < 310

°C (590°F), do not use a

reflow oven to solder this laser driver.

Figure 14. Driving High Voltage Laser Diodes

Warning: To turn on the laser, firstly turn on Power Supply 2 and Power Supply 1 while keeping SBDN=0, after >=100mS,

then turn on the laser driver ATLS25A219D by using the SBDN pin. To turn off the laser, firstly turn off the laser driver

ATLS25A219D by driving the SBDN pin to Standby or Off State, then turn off the Power Supply 2 and 1.