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10

PLD10000/PLD12500 LASER DIODE DRIVER

7,8,9

4,5,6

OR

LD Anode

LD Cathode

13,14,15

22

LD Enable

Closed = Output Enabled

Open = Output Disabled

10,11,12

--

++

+5 V

GND

(Internally Shorted)

16

19

18

21

17

20

Analog Input

LIM I Monitor

LIM I Status

++

--

5 VDC

PD

LD

PD Anode

3

0.1 µF

Common

(Low Current)

GND

PD

LD

Short pin 16 to pin 19 when

analog input is not used.

Use caution when the PTC is combined

with a PLD laser driver: if the TEC or

thermistor is connected to the laser diode,

two power supplies are required and must

float independently of each other.

10 k

Pull Up Resistor

DMM

P Monitor

(PD Current)

I Monitor

(Output Current)

Optional External

Setpoint (0 to 5 V)

Figure 8. Type A & B Laser Diode, Negative Power Supply Operation

7,8,9

4,5,6

LD Anode

LD Cathode

13,14,15

22

LD Enable

10,11,12

+5 V

GND

(Internally Shorted)

16

19

18

21

17

20

Analog Input

LIM I Monitor

LIM I Status

++

--

PD Cathode

2

Common

(Low Current)

PD

LD

OR

Closed = Output Enabled

Open = Output Disabled

++

--

10µF

+5V

0.1µF

8 to

12 VDC

Heatsinking

Required

LM 317

+5V REG.

732

243

1

3

2

330µF

0.1µF

This circuit shows how to use a single power supply.

The LM317 (+5 V Regulator) circuit can be replaced

with a separate 5 VDC power supply.

PD

LD

24

Aux V+

323

PD

Anode

PD

Aux

Use caution when the PLD is combined with a PTC

temperature controller: if the TEC or thermistor is

connected to the laser diode, two power supplies are

required and must float independently of each other.

Short pin 16 to pin 19 when

analog input is not used.

Optional External

Setpoint (0 to 5 V)

+5V

10 k

(Pull Up Resistor)

DMM

P Monitor

(PD Current)

I Monitor

(Output Current)

Figure 9. Type C Laser Diode

NOTE: For dual supply operation, it is critical to shut down the power supply to the laser first before shutting down the +5V

supply powering the electronics.