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WLD3343
PAGE 8
WLD3343-00400-O
Caution:
Do not exceed the Safe Operating Area (SOA). Exceeding the SOA voids the warranty.
An online tool is available for calculating Safe Operating Area at:
http://www.teamwavelength.com/support/calculator/soa/soald.php
.
To determine if the operating parameters fall within the SOA of the device, the maximum voltage drop across the
controller and the maximum current must be plotted on the SOA curves.
These values are used for the example SOA determination:
Vs = 9 volts
VLoad = 6 volts
ILoad = 2.5 amps
Follow these steps:
1. Determine the maximum voltage drop across the driver,Vs-VLoad, and mark on the X axis.
Example: 9 volts - 6 volts = 3 volts, Point A)
2. Determine the maximum current, ILoad, through the driver and mark on the Y axis:
(2.5 amps, Point B)
3. Draw a horizontal line through Point B across the chart. (Line BB)
4. Draw a vertical line from Point A to the maximum current line indicated by Line BB.
5. Mark
V
S
on the X axis. (Point C)
6. Draw the Load Line from where the vertical line from point A intersects Line BB down to Point C.
Refer to the chart shown below. Note that the Load Line is in the Safe Operating Area for use with heatsink and fan (3).
It is in the Unsafe Operating Area for use with no heatsink (1) or the heatsink alone (2).
These values are determined from the speci
fi
cations of the laser diode.
}
Graphs assume:
25°C Ambient
75°C Case
A
B
BB
C
SAFE OPERATING AREA & HEATSINK REQUIREMENTS
