PLD datasheet(18/21 Pages) WAVELENGTH

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PLD SERIES 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 driver. If that power limit is exceeded permanent

damage can result.

DonotoperatethePLDdriveroutsideofthe

Safe Operating Area curve.

OperatingthePLDDriveroutsideoftheSOA

voids the warranty.

Refer to the Wavelength Electronics website for the most

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

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

operating temperature.

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

SOAcharts are included in this datasheet for quick reference,

however we recommend you use the on-line 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 the 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.

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

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

0.20

Voltage Across Wavelength Device (V)

Figure 23. SOA for PLD200

0.02.5

5.07.5

10.0 12.5 15.0 17.5 20.0 22.5 25.027.530.0

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0.50

Voltage Across Wavelength Device (V)

Figure 24. SOA for PLD500

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

0.00

0.25

0.50

0.75

1.00

1.25

Voltage Across Wavelength Device (V)

Figure 25. SOA for PLD1250

0.02.5

5.07.5

10.012.5 15.017.520.022.525.0 27.530.0

0.00

1.00

2.00

3.00

4.00

5.00

Voltage Across Wavelength Device (V)

Figure 26. SOA for PLD5000

0.02.5

5.07.5

10.012.5 15.017.520.022.525.0 27.530.0

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

5.00

5.50

6.00

6.50

Voltage Across Wavelength Device (V)

Figure 27. SOA for PLD6500

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