USBKIT datasheet(6/20 Pages) WAVELENGTH

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PLD10000/PLD12500 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 PLD and the laser. 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 online

instructions for calculating the Safe Operating Area:

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

SOA charts are included in this datasheet for quick reference

(

page 17), but we recommend you use the online tools

instead.

To ensure safe operaTion of The pLD 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 PLD10000 and PLD12500 drivers are controlled

linear-mode 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 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 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.

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