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3

Analog Technologies

ATLS500MA106

Low Noise Constant Current Laser Controller

APPLICATIONS

Figure 4.1 shows a typical application circuit. W1 and W2 set the output current limit and output current respectively. Resistor

R1 and capacitor C1 form a low pass filter, to lower the noise from the voltage reference.

Laser diode D1 is connected between LDA and PGND. It is worth mentioning that the power supply return terminal should be

connected to the pin 11 PGND and the cathode of the laser diode should be connected to the pin 10 LDC. These 2 nodes should

not be connected together externally and they are connected together internally already by the controller.

Power Supply 5V

Power Supply 0V

To ADC

To ADC

1

2

D1

Laser Diode

1

2

D2

LED

Loop Good Indication

1

2

S1

SPST

Shut Down

SBDN

1

GND

2

2.5VR

3

LIMS

4

LIS

5

LIO

6

VPS 12

PGND 11

LDC 10

LDA 9

TMPO

8

LPGD

7

ATLS250MA106

3

W1

20K

3

W2

20K

1

2

C1

100uF 6.3V

Current Set (Clock-wise)

1206

Current Limit Set (Clock-Wise)

MLC Capacitor

1

2

R1 100K

Figure 4.1. Typical Stand-alone CW Operation Schematic for ATLS500MA106

Power Supply 5V

Power Supply 0V

To ADC

To ADC

1

2

D1

Laser Diode

1

2

D2

LED

Loop Good Indication

1

2

S1

SPST

Shut Down

SBDN

1

GND

2

2.5VR

3

LIMS

4

LIS

5

LIO

6

VPS 12

PGND 11

LDC 10

LDA

9

TMPO

8

LPGD 7

ATLS500MATF-S

3

W1

20K

3

W2

20K

1

2

R1 100K

1206

MLC Capacitor

Current Limit Set (Clock-Wise)

Current Set (Clock-wise)

1

2

R2 100K

AC Modulation Signal

1

2

1uF to 100uF

C2

1

2

100uF 6.3V

C1

Figure 4.2. Typical AC Modulation with DC bias Schematic for ATLS500MA106

ATLS500MATF

ATLS250MA106

ATLS500MA106

ATLS500MA106