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PLD SERIES LASER DIODE DRIVER

QUICK CONNECT GUIDE, CONTINUED

CONSTANT POWER TEST LOADS

These loads are intended to operate at around 500-750 µA

of photodiode current at a laser diode drive current of

approximately 50% of the maximum laser diode current for

each model of PLD.

To achieve this the circuit components must be changed

specific to each PLD model. The following table shows the

component values that should be used.

The R

E resistor will typically produce a load voltage of 2.25 V

to 4.25 V, depending on the PLD model being used. Adjust

L to change the compliance voltage of the load and change

E to adjust the “sensitivity” of the simulated photodiode.

PLD

MODEL

(Ω)

(V)

(Ω)

D1, D2

PIN12-PIN13

(V)

PLD200

1.2

1.2K

1N4001

2.56

PLD500

1.5

1.2K

1N4001

2.86

PLD1250 2

1.25

1.2K

80SQ035

2.25

PLD5000 1

2.5

3.65K

80SQ035

3.5

PLD6500 1

3.25

5.1K

80SQ035

4.25

Figure 5 illustrates a test load that can be used to operate

the PLD in Constant Power mode to simulate use with type

A/B lasers.

Figure 5. Constant Power Mode Test Load,

Type A/B Lasers

Figure 6 illustrates a test load that can be used to operate

the PLD in Constant Power mode to simulate use with a

type C laser.

The PLD series can operate in Constant Power mode

assuming that the user provides a PD auxiliary supply

voltage (PDAUX) separate from the laser diode power

supply. The PDAUX voltage must be approximately 2 V

greater than the LD supply voltage.

Figure 6. Constant Power Mode Test Load,

Type C Lasers

NOTE: Jumper PD Aux (pin 2) and PDA (pin 14)

2N3904

0.33 µF

PD CATHODE

LD ANODE

LD CATHODE

LD ANODE

0.33 µF

PD ANODE

LD CATHODE

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