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3

Analog Technologies

ATLS25A219D

32V 25A Constant Current Laser Driver

7

PCN

Digital

Input

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

∼ 0.4Vand a high value set by the LISH

∼5V. This PCN pin is pulled high to an internal 5V rail by an internal

1M

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

Figure 3. 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.

8

SBDN

Analog/

Digital

Input

Standby and Shutdown Control. This pin has 3 regions: between 0V

∼ 0.4V, it shuts down

the entire laser driver; between 2.1V

∼ 2.4V, it sets the laser driver to standby mode; between

2.6V

∼ 15V, it sets the laser driver to operation mode. The input current on this pin is < 2µA.

9

LPGD

Digital

Output

Loop Good Indication. When the laser driver's output current equals to the set-point current

value, and there is no short nor open circuit at the output, this pin is pulled up high by an

internal 3k

Ω resistor to an internal 4.5V power supply as shown in Figure 3; when the output

current is not equal to the set-point current, such as there is an open circuit at the output, or

the load has too high a resistance that even the output voltage reaches the power supply

voltage, the output current is still lower than the set-point value, this pin is pulled low by an

open drain MOSFET of which Rdson< 500

Ω. When outputting the low value, the sinking

capability is < 0.5V at 1mA.

10

SYNO

Digital

Output

Synchronization Output. This is a digital output signal with internal impedance of 100

Ω by

passed by 1.5MHz low pass filter. This output is triggered by the PWM output stage of this

laser driver and can be used to synchronize other switch mode electronics to avoid the beating

interference with their free-run frequencies if their free-run frequencies are close to 500kHz.

If the free-run frequency of other electronics is far away from 500kHz, no need to use this

pin.

11,12,

13,14

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.

15,16,

17,18

PGLDC

Power Input

& Output

This pin has two functions:

1. 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.

2. LDC Pin. Connect it to laser diode cathode terminal. The maximum current on this pin can

go up to 25A.

19

LDCSN

Analog

Output

Connect it to the laser diode cathode directly.

20,21,

22,

VPS

Power Input

go up to 25A.