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9

Analog Technologies

ATLS3A212

High Voltage Constant Current 3A Laser Driver

Adjusting the Output Current

In typical standalone configuration the output current is set

by adjusting W1 and W2, which set input voltages of LISL

and LISH, pin 6 and 7 respectively. See Figure 7. The

output current will be:

LISL and LISH can also be set using DAC as in Figure 8.

Make sure that DAC has low output noise.

Monitoring the Output Current

The output current of the driver can be monitored by

measuring the voltage on the LIO pin. This feature is very

useful for micro-controller based system where the ADC is

available and monitoring the current in real time is required.

This pin provides a very low noise voltage signal and is

proportional to the output current:

For example, when the output current is 3A, the output signal

is 2.5V.

LIO can be used to drive an ADC directly, and also be

measured by a multi-meter.

Driver Power Consumption

The best way for arranging the heat sinking for the driver is as

follows: transferring the heat by sandwiching a piece of

thermal conductive pad between the top metal surface of the

laser driver and the internal metal surface of the final product

as shown in Figure 9.1 and 9.2 below. The recommended

thickness of the thermal conductive pad in Figure 9.1 is

1~4mm, and in Figure 9.2 is 0.5mm. ATI also provides a series

Figure 9.1 Transferring Heat with Metal Enclosure

Figure 9.2 Transferring Heat with Heat Sink