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6

Analog Technologies

ATLS500MA106

Low Noise Constant Current Laser Controller

calculated data by using the formula (1) and the

approximated data obtained by using the linear equation (2)

is about 0.4

°C, with the linear data being a little lower. The

curves of the 2 sets of the data are plotted in Figure 11.

Please notice that the TMPO pin has a weak driving

capability: the maximum sourcing current is 1

μA and the

maximum sinking current is 40

μA.

The TMPO pin can also be used as an input control pin:

when forcing the TMPO voltage to below 0.4V, the laser

controller will be shutdown.

Controller Power Consumption

When the maximum power consumed by the controller is

maintained to <1W, it does not require a heat sink to

operate. The power dissipated by the controller can be

calculated by this formula:

current going through the load.

Figure 7 shows the current distributions of the controller.

Figure 7. The Current Distributions in the Controller

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 8.1 and 8.2 below. The

recommended thickness of the thermal conductive pad in

Figure 8.1 is 1~4mm, and in Figure 8.2 is 0.5mm. ATI also

provides a series of thermal conductive pads, click here for

more information.

If prefer not to use the heat sink, this is an option: lowering

the controller power consumption by reducing the power

voltage.

Figure 8.1 Transferring Heat with Metal Enclosure

GND

LDC

+

－

+

－

PGND

VPS

LDA

Laser Driver

Control

Circuit