ATLS6A201D datasheet(5/10 Pages) ANALOGTECHNOLOGIES

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Analog Technologies

ATLS6A201D

Constant Current Laser Driver

if no modulation is needed, an RC low pass filtered by be

inserted between the DAC and the LIS pin. See Figure 5.

The LIO can still be used to monitor the output current when

the LIS is adjusted. 0V to 2.5V indicates the laser current of

from 0A to 6A linearly.

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-driver 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:

VLIO (V) = 2.5 (V)

× IOUT (A)/6.0 (A).

For example, when the output signal is 2.5V, the output

current is 6A.

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

measured by a multi-meter.

Figure 6 shows the relationship between Pin VPS and LDA.

VVPS (V)

VLDAMAX

VLDAMIN

Normal

Operation

Region

IMAX = 6A

3.3

0.2

3.5

2.1

VLDA

(V)

Figure 6. VVPS vs. VLDA

Driver Power Consumption

The power consumption of the driver can be calculated by:

PDRIVER = IIN

× VVPS – IOUT × VLDA,

where PDRIVER is the power consumed by the driver itself; IOUT

is the output current;

IIN is the power supply’s input current;

VVPS is the power supply voltage;

VLDA is the voltage across the laser diode;

η = (IOUT

× VLDA) / (IIN × VVPS).

When the PDRIVER 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 7.1 and 7.2 below. The recommended

thickness of the thermal conductive pad in Figure 7.1 is

1~4mm, and in Figure 7.2 is 0.5mm. ATI also provides a

series of thermal conductive pads, click here for more

information.

Figure 7.1 Transferring Heat with Metal Enclosure

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