USBKIT datasheet(17/20 Pages) WAVELENGTH

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PLD10000/PLD12500 LASER DIODE DRIVER

SAFE OPERATING AREA CALCULATION

The Safe Operating Area of the PLD driver is determined by

the amount of power that can be dissipated within the output

stage of the driver. If that power limit is exceeded permanent

damage can result.

Do noT operaTe The pLD Driver ouTsiDe of The

safe operaTing area curve.

operaTing The pLD Driver ouTsiDe of The soa

voiDs The warranTy

Refer to the Wavelength Electronics website for the most

up-to-date SOA calculator for our products. The online tool

is fast and easy to use, and also takes into consideration

operating temperature.

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

SOAcharts are included in this datasheet for quick reference,

however we recommend you use the online tools instead.

Follow these steps to determine if the driver will be operating

within the SOA.

• Refer to the laser diode datasheet to find the maximum

voltage (V

MAX) and current (IMAX) specifications

• Calculate the voltage drop across the controller:

DROP = VS - VMAX (VS is the power supply voltage)

• Mark V

DROP on the X-axis, and extend a line upward

• Mark I

MAX on the Y-axis, and extend a line to the right

until it intersects the V

DROP line

• On the X-axis, mark value of V

• Extend a diagonal line from V

S to the intersection of the

DROP and IMAX lines; this is the Load Line

• If the Load Line crosses the Safe Operating Area line at

any point, the configuration is not safe

If the SOA calculator indicates the PLD will be outside of the

Safe Operating Area, the system must be changed so that

less power is dissipated within the driver. See Wavelength

Electronics Application Note AN-LDTC01: The Principle of

the Safe Operating Area for information on shifting the Load

Line.

After changing any of the parameters, recalculate the SOA

to make sure the driver will operate safely. If you have

questions, or run into difficulties calculating the SOA, contact

Wavelength Electronics for assistance.

0.0

2.5

5.0

7.5

10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

10.0

Voltage Drop (V)

Figure 21. SOA for PLD10000

0.0

2.5

5.0

7.5

10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0

0.0

2.5

5.0

7.5

10.0

12.5

Voltage Drop (V)

Figure 22. SOA for PLD12500

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