PLD datasheet(7/21 Pages) WAVELENGTH

7 / 21 page

www.teamWavelength.com

PLD SERIES LASER DIODE DRIVER

SAFETY INFORMATION

SAFE OPERATING AREA — DO NOT EXCEED

INTERNAL POWER DISSIPATION LIMITS

Before attempting to operate the PLD driver, it is imperative

that you first determine that the unit will operate within the

Safe Operating Area (SOA). Operating outside of the SOA

may damage the laser and the PLD. Operating outside of

the SOA will void the warranty.

To determine if the PLD driver is suitable for your application

and if it will be operating in the safe range, consult the

instructions for calculating the Safe Operating Area on-line:

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

SOA charts are included in this datasheet for quick reference

(

page 18), but we recommend you use the on-line tools

instead.

ToensuresafeoperationofthePLDdriver,itis

imperativethatyoudetermineiftheunitisgoingto

beoperatingwithintheinternalheatdissipation

Safe Operating Area (SOA).

If you have any questions about the Safe Operating Area

calculator, call the factory for free and prompt technical

assistance.

THEORY OF OPERATION

The PLD Series drivers are controlled current sources: they

deliver the current commanded by the setpoint. The current

source continually monitors the actual output current,

compares it to the setpoint, and adjusts the current if there

is a difference between the two signals.

It may be useful to remember that you do not directly set

the drive current setpoint; instead, you adjust a voltage

signal that represents the output current. The voltage and

output current are related by a transfer function that varies

by driver model number.

The setpoint voltage is adjusted with the onboard trimpot or

by an external input that sums with the onboard setpoint.

The adjustable current limit is set in a similar manner.

As current is driven through the load, there is a voltage drop

across the load because of the impedance. As the current

increases, the voltage drop may increase to the point that it

reaches the Compliance Voltage limit of the current source.

Once that occurs, the current source is no longer able to

increase the current driven to the load even if you increase

the setpoint.

The PLD driver includes features that help protect your

laser and make the driver more versatile in a wide array of

applications:

• The user-adjustable latching current limit protects the

laser from over-current situations by switching off the

output when a limit condition is detected. Toggling the

Enable resets the current limit circuit.

• Output current switches on after approximately 1.5

seconds from the time the Enable signal is applied.

• Output slow-start ramps the current to setpoint over

250 msec.

• A mechanical relay shorts the output connections when

the output is disabled, and when the PLD driver is

powered off.

PLD Datasheet(PDF) 7 Page - Wavelength Electronics, Inc.

PLD Datasheet(HTML) 7 Page - Wavelength Electronics, Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

Datasheet Download

Link URL