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PLD SERIES LASER DIODE DRIVER

CABLE LENGTHS AND HIGH CURRENT

The length and gauge of cable from the power supply or

to the laser diode can impact performance. The resistance

and inductance of the wire can reduce bandwidth or cause

the voltage to the PLD to droop.

If the output current starts to oscillate as setpoint voltage

approaches the limit setting, then the power supply cables

may be too long. If you cannot shorten the cables, place a

330 µF capacitor across pins 10 and 11 to minimize droop.

Always twist the wire pairs to eliminate reactance.

ADD LASER DIODE PROTECTION FOR LONG

CABLES

With a cable longer than two feet, add a Schottky diode

across the laser diode, see

Figure 17.

Laser

Diode

Schottky

Diode

(1N5818)

Cable > 2 feet

LD Anode

LD Cathode

Figure 17. Long Cable Laser Protection

ADDITIONAL NOISE FILTERING

The PLD drivers provide low-noise current to the laser

diode, but in some cases additional filtering may be needed.

Refer to

Figure 18 for a simple and effective filter.

LD Anode

LD Cathode

Schottky

Diode

(1N5818)

0.1 µF

10 µF

Figure 18. PLD Output Filter

MONITOR CALIBRATION CIRCUIT

A small offset may be present when measuring the

P Monitor, I Monitor or LIM I Monitor voltage with respect

to the actual output. Use the circuit shown in

Figure 19 to

remove any offset.

Common

Pin 19

10 k

20 k

Monitors

Pin 5, 7, 8

Calibrated

Current

Setpoint

Figure 19. Monitor Calibration Circuit

REVISION F TIMING CHARACTERISTICS

Table 4 and Table 5 describe the timing and bandwidth

characteristics of the PLD Series Revision F units.

Table 4. Output Timing, Revision F

TURN-ON

TIME

TURN-OFF

TIME

SLOWSTART

DELAY

6.8 µsec

≥1.5 sec

Table 5. Output Bandwidth, Revision F

MODEL

BANDWIDTH

PLD200

65 kHz

PLD500

100 kHz

PLD1250

100 kHz

PLD5000

100 kHz

PRODUCT VARIATIONS

We design and manufacture our products in-house, and

that gives us the unique ability to modify our drivers and

controllers to suit your application. Our Product Variation

service allows us to quickly and cost-effectively address

your design requests, from prototype quantities to long-

term high-volume manufacturing.

Examples of past Product Variations include:

• Increasing the compliance voltage limit

• Replacing current limit trimpots with fixed-value

resistors to maximize long-term stabilty in an OEM

laser controller system

• Optimizing heatsink size and configuration to fit within

the space constraints of your electronics chassis

• Changing the controller input voltage

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