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2

Analog Technologies

ATLS25A219D

32V 25A Constant Current Laser Driver

5

6

7

8

9

12

13

14

1

2

3

4

ATLS25A219

18

17

16

15

LISL

GND

TMPO

PCN

SBDN

LISH

4VR

LIO

VPS

LDCSN

LDA

PGLDC

PGLDC

VPS

VPS

22

19

10

21

11

20

LPGD

LDA

SYNO

PGLDC

PGLDC

LDA

LDA

CASE

Figure 2. Pin Names and Locations

Figure 2 is the top view of the ATLS25A219D, which also

shows the pin names and locations. Its thickness is 4.5mm.

The pin functions and specifications are described in Table

1 below. Note that the metal case is internally connected to

ground.

Table 1.Pin Function Descriptions

Pin #

Name

Type

Description

1

LIO

Analog

Output

Laser Current Output Indication. 0V to 4.096V indicates the laser current being from 0 to

25A linearly. The maximum sourcing current and sinking current of LIO is 40mA.

2

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.

3

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 7, 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 4.096V. It is recommended to use

the 4VR port, pin 4, as the voltage source for setting the output current.

4

4VR

Analog

Output

Voltage Reference 4.096V output. It can source and sink up to 10mA output current, with a

very low5

this pin is still working.

5

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 6.

6

TMPO

Analog

Output

Temperature Output Pin. This pin indicates the controller temperature. The relationship

between the output voltage and the temperature is:

)

(

479

.

3

8015

.

1

4182

.

2

10

04

.

1525

3

C

V

T

TMO

°

−

+

+

−

=

or,

















−













+

−

=

4182

.

2

10

04

.

1525

479

.

3

8015

.

1

2

3

T

V

TMO

This formula can be approximated by a linear equation with about 1% error

between −40°C ~ 125°C:

)

(

1040

.

90

5576

.

192

C

V

T

×

−

=

or,

)

(

0111

.

0

1365

.

2

C

T

V

TMO

°

×

−

=

The maximum output current of the TMO pin is 1uA.

(1)

(2)

(3)

(4)