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3

Analog Technologies

ATLS4A217

High Voltage Constant Current 4A Laser Driver

5

PCN

Digital Input

Pulse Control input. This pin toggles the laser output current to change between the pre-set

∼ 0.4Vand a high value set by the

∼ 4.5V. This PCN pin is pulled high to an internal 4.5V rail by a

1M

Ω resistor and there is a serial 20kΩ resistor between PCN and the electronic switch, see

Figure 3. Between 0V

∼ 4.5V, the pull up resistor causes most of the current on this pin, the

electronic switch input current is < ±1µA. The maximum voltage on this pin is 15V, at which

the pull down current will be caused by the serial 20k

Ω clamped by an over voltage protector

of 5V, the current will be (15V

−5V)/20kΩ = 500µA.

The rise and fall time of the output is 28µS when PCN pin is switched.

6

GND

Signal Ground

Signal Ground pin. Connect ADC and DAC grounds to here. When using POTs

(potentiometer) to set the output currents, connect the ground terminal of the POTs to here.

7

2.5VR

Analog Output

Voltage Reference 2.5V output. It can source and sink up to 10mA output current, with a

very low 5

this pin is still working.

8

LISL

Analog Input

Laser current low value setting voltage. There is a10M

Ω input resistor tied to GND. Setting

it from 0V to 2.5V will set the laser lower current from 0 to 4A linearly. The current set by

this pin can be higher than the current set by the LISH port on pin 7, the reason calling it

"low" is because when PCN, pin 3, is low, the laser driver will output the current set by this

pin. The input bias current of this pin is < 0.1

μA, in addition to the 10MΩ resistor tied to

GND. The maximum input voltage on this pin is 4.5V. It is recommended to use the 2.5VR

port, pin 5, as the voltage source for setting the output current.

9

LISH

Analog Input

Laser current high value setting voltage. For this pin, everything is the same as above except

that this pin sets the output current when PCN, pin 3 is high.

10

LIO

Analog Output

Laser Current Output indication. 0V to 2.5V indicates the laser current being from 0 to 4A

linearly.

11

LDA

Analog Output

Laser Diode Anode. Connect it to the laser diode anode terminal. The maximum current of

this pin can go up to 4A. When doing layout, do not use a thin and long PCB track, otherwise,

the inductance might be too high and oscillation may occur.

12

LDA

Analog Output

The same as Pin 11.

13

LDC

Analog Output

Laser Diode Cathode. Connect it to the laser diode cathode terminal. The current on this pin

can go up to 4A. Use thick and short PCB track for this pin to minimize the inductance to

avoid oscillation or ringing. This pin has a low voltage potential, when the output current is

4A, the potential is 16mV above PGND.

14

LDC

Analog Output

The same as Pin 13.

15

PGND

Power Ground

Power ground pin. Connect this pin directly to power supply return path line, 0V. The

maximum current on this pin can go up to 4A.

16

PGND

Power Ground

The same as Pin 15.

17

VPS

Power Input

go up to 4A.

18

VPS

Power Input

The same as Pin 17.