PLDSERIES datasheet(8/21 Pages) WAVELENGTH

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PLD SERIES LASER DIODE DRIVER

OPERATING INSTRUCTIONS

The PLD requires minimal external electronics. If you are

using the driver on the benchtop or for prototyping your

laser control system, we recommend purchasing the

PLDEVALPCB board.

The driver is first configured for local control in order to

set the drive current limit. Then the driver is reconfigured

according to the actual application.

We recommend using a test load until you are familiar with

operation of the driver. Refer to

page 3 for test load

schematics.

NECESSARY EQUIPMENT

The following equipment is the minimum necessary to

configure the PLD for basic operation:

• PLD controller

• PLDEVALPCB evaluation board (recommended)

• Digital voltmeter, 4-½ digit resolution recommended

• Test load for configuring the driver

• Laser diode, mount, and temperature control system

• Connecting wires

• Power supply (see below)

POWER SUPPLY REQUIREMENTS

Linear-regulated or low-noise switching power supplies can

be used. We recommend using power supplies with noise

specifications suitable for your application.

For single-supply operation:

• 5 VDC power supply rated for 1.1-times the maximum

laser diode current, plus 50 – 250 mA for the electronics

(see

Electrical Specifications)

For two-supply operation to drive a high-compliance laser:

• 5 VDC power supply rated for 50 – 250 mA

• Power supply rated for 1.1-times the maximum

laser diode drive current and > 2 V greater than the

compliance voltage of the laser.

For Type C lasers:

• 8 to 12 VDC power supply rated for 50 – 250 mA, plus

1.1-times the maximum laser diode drive current; power

regulation circuitry is also required (see

Figure 11)

• OR, a 5 VDC power supply for the PLD driver electronics

(rated for 50 – 250 mA) and an 8 to 12 VDC power

supply for the laser, rated for 1.1-times the maximum

laser diode current

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. Failure

to follow this order may damage the PLD or laser.

SAFE OPERATING AREA AND

THERMAL DESIGN CONSIDERATIONS

SOAcharts are included in this datasheet for quick reference,

but we recommend you use the on-line tools instead.

www.teamwavelength.com/support/design-tools/soa-ld-calculator

It is imperative that you verify the unit will

operate within the internal heat dissipation

Safe Operating Area (SOA).

Operating the driver outside the SOA may

damage or destroy the driver and/or laser.

PREVENT DAMAGE FROM ELECTROSTATIC

DISCHARGE

Before proceeding, it is critical that you take precautions to

prevent electrostatic discharge (ESD) damage to the driver

and your laser. ESD damage can result from improper

handling of sensitive electronics, and is easily preventable

with simple precautions.

Enter the search phrase “ESD Precautions for Handling

Electronics” in an internet search engine to find information

on ESD-safe handling practices.

We recommend that you always observe ESD precautions

when handling the PLD driver and your laser diode.

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