WHS302 datasheet(25/31 Pages) WAVELENGTH

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WLD SERIES LASER DIODE DRIVERS

SAFE OPERATING AREA CALCULATION

The Safe Operating Area of the WLD 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 WLD driver outside of

the Safe Operating Area curve.

Operating the WLD 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.

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

SOA charts are included here 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 SOACalculator indicates the WLD 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 operating 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.

WLD33ND SOA Chart:

SAFE OPERATION

UNSAFE OPERATION

0.5

1.0

1.5

2.0

2.5

10 11 12 13

Voltage Across WLD33ND (V)

Figure 22. SOA for WLD33ND with thermal washer, heatsink,

and fan.

WLD33ND-HB SOA Chart:

SAFE OPERATION

UNSAFE OPERATION

0.5

1.0

1.5

2.0

2.5

Voltage Across WLD33ND-HB (V)

Figure 23. SOA for WLD33ND-HB with thermal washer,

heatsink, and fan.

WLD33ND-3A SOA Chart:

SAFE OPERATION

UNSAFE OPERATION

10 11 12 13

0.5

1.0

1.5

2.0

2.5

3.0

3.5

Voltage Across WLD33ND-3A (V)

Figure 24. SOA for WLD33ND-3A with thermal washer,

heatsink, and fan.

WHS302 Datasheet(PDF) 25 Page - Wavelength Electronics, Inc.

WHS302 Datasheet(HTML) 25 Page - Wavelength Electronics, Inc.

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