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Analog Technologies
ATLS1A102
Low Noise Constant Current Laser Driver
VPS voltage is stabilized to turn on the laser.
2.
If choose not to control the SDN pin for turning on the
laser, leave the SDN pin unconnected. There is an
internal capacitor holding SDN pin to logic low. Now,
the laser can be turned on and off by using the VPS pin.
Controller Power Consumption
The power consumption of the controller can be calculated
by:
P
DRIVER
= I
OUT
×
(V
VPS
– V
LDA
),
where I
OUT
is the output current;
V
PS
is the power supply voltage;
V
LDA
is the voltage across the laser diode.
When the P
DRIVER
exceeds 1W, a heat sink might be needed.
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 5.1 and 5.2 below. The recommended
thickness of the thermal conductive pad in Figure 5.1 is
1~4mm, and in Figure 5.2 is 0.5mm. ATI also provides a series
of thermal conductive pads, click
for more information.
Figure 5.1 Transferring Heat with Metal Enclosure
Figure 5.2 Transferring Heat with Heat Sink
