LDDEVALP datasheet(7/28 Pages) WAVELENGTH

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LDD P SERIES LASER DIODE DRIVER

SAFETY INFORMATION

SAFE OPERATING AREA — DO NOT EXCEED

INTERNAL POWER DISSIPATION LIMITS

Before attempting to operate the LDD P Series 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 LDD P. Operating

outside of the SOA will void the warranty.

To determine if the LDD P Series 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 online:

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

SOA charts are included in this datasheet for quick reference

(

page 24), but we recommend you use the online tools

instead.

To ensure safe operation of the LDD P

driver, it is imperative that you determine if

the unit is going to be operating within the

internal heat dissipation 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 LDD P 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 subtracts from the onboard

setpoint. The adjustable current limit is set using an onboard

trimpot.

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 LDD P driver includes features that help protect your

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

applications:

• Output slow-start ramps the current to setpoint.

• Current limits prevent too much current from reaching

the laser diode.

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