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2

Analog Technologies

ATLS500MA201D

Constant Current Laser Driver

5

LIS

Analog Input

Laser current set-point voltage. There is an input resistor of 10M tied to GND. Setting

it from 0V to 2.5V will set the laser current from 0A to 500mA linearly.

6

LIO

Analog Output

Laser current output indication. 0V to 2.5V indicates the laser current of from 0A to

500mA linearly.

8

LIGD

Analog Output

Laser current good, control loop indication. When this pin is stabilized and the value

is between 1V and 2.4V, the output voltage to the laser, Pin 9 LDA, will be 4.5V to

0V linearly, the laser current is stabilized, and the control loop is stable.

9

LDA

Analog Output

Laser diode anode. Connect it to the anode of the laser diode.

10

LDC

Analog Output

Laser diode cathode. Connect it to the cathode of the laser diode.

11

PGND

Power Ground

Power ground pin. Connect this pin directly to power supply return pass.

12

VPS

Power Input

SPECIFICATIONS

°C)

Parameter

Test Condition

Value

Unit

Laser driver efficiency

≥90

%

Maximum output current

0.5

A

Output current noise

2.74

@0.1Hz-

10Hz

Stability @ 1A

°C ∼ 80°C

±0.2

%

Laser current control signal range at LIS

∼ 6V

− 0.2

V

LIS control accuracy

Relative accuracy = (accuracy current – set

point current) / set point temp.

±0.2

%

Laser current indication signal range at

LIO

∼ 6V

0 ~ 2.5

V

LIO indication accuracy

∼ 6V

±0.2

%

Reference voltage

∼ 6V

2.5

V

Reference Voltage temperature co

efficiency

∼ 6V

Output voltage range at LDA

∼ 6V

V

PWM frequency

500

kHz

Power supply voltage range

3.1 ~ 6

V

Maximum power supply voltage

−

6

V

Start-up time

4

ms

Typical pull-down current at LDGD

6

mA

Operating case temperature

−40 ~ 85

°C

Rise times of small signal

70

µS

Fall times of small signal

70

µS

Rise times of large signal

352

µS

Fall times of large signal

184

µS

OPERATION PRINCIPLE

The block diagram of the driver is shown in Figure 3. The

shut down control circuit accept signals from 3 sources:

external shut down, over current and over temperature

signals. When one of these signals is activated, the driver is

shut down. Only when all these 3 signals go up, the soft start

circuit starts enabling the low noise driver.

An internal soft start circuit allows a slow start up and a quick

shut down.

The high stability low noise 2.5V voltage reference can be used

for setting the output current, and also be used for the ADCs