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3

Analog Technologies

ATLS25A219GUI

32V 25A Constant Current Laser Driver

Table 1. Pin Function Descriptions

Terminal

Block

Pin #

Name

Type

Description

Terminal

1

VPS

Power Input

maximum current can go up to 25A.

2

PGND

Power Input

Power Ground Pin. Connect this pin directly to power supply return path

line, 0V. The maximum current on this pin can go up to 25A.

3

LDC

Analog Output

LDC Pin. Connect it to laser diode cathode terminal. The maximum

current on this pin can go up to 25A.

4

LDA

Analog Output

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

maximum current of this pin can go up to 25A. When doing layout, do not

use a thin and long PCB track, otherwise, the inductance might be too high

and oscillation may occur.

Mini USB

5

4VR

Analog Output

It connects the controller to the computer.

6

GND

Analog Output

7

TXD

Analog Output

8

RXD

Analog Output

Type C

9

4VR

Analog Output

Voltage Reference 4.096V output. It can source and sink up to 10mA

output current, with a very low5

6ppm/

°C stability. Under Standby Mode, this pin is still working.

10

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. See Figure 9.

11

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

7 is high.

12

LISL

Analog Input

Laser Current Low Value Setting Voltage. There is a10M

Ω input resistor

tied to GND. Setting it from 0V to 4.096V will set the laser lower current

from 0 to 25A linearly. The current set by this pin can be higher than the

current set by the LISH port on pin 2, the reason calling it "low" is because

when PCN, pin 13, 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

10M

Ω resistor tied to GND. The maximum input voltage on this pin is

4.096V. It is recommended to use the 4VR port, pin 9, as the voltage

source for setting the output current.

13

PCN

Digital Input

Pulse Control Input. This pin toggles the laser output current to change

PCN pin is pulled high to an internal 5V rail by an internal 1M

Ω resistor

and there is a serial 20k

Ω resistor between PCN and the electronic switch,

see Figure 6. Between 0V

∼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 40V, 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 (40V

−5V)/20kΩ = 1.75mA.

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

14

SBDN

Analog/

Digital Input

ON, Standby and Shutdown Control.