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LDTC0520 / LDTC1020
PAGE 8
LDTC1020-00400-A Rev B
TYPICAL PERFORMANCE GRAPH FOR SINGLE FL500 (2 Watt, 500 mA)
Caution:
Do not exceed the Safe Operating Area (SOA) of the FL500. Exceeding the SOA voids
the warranty.
To determine if the operating parameters fall within the SOA of the device, the load line for your confi guration must be
plotted on the SOA curves.
The values used for this example SOA determination are:
V
s
= 3 Volts
V
Load
= 2 Volts
I
Load
= 400 mA
Follow these steps:
1.
Determine the maximum voltage drop across the driver,V
s
-V
Load
, and mark on the X axis.
Example: 3 Volts - 2 Volts = 1 Volt, Point A)
2.
Determine the maximum current through the driver and mark on the Y axis:
(400 mA, 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 and note that the Load Line is in the Safe Operating Area. Note that this chart is for the
LDTC0520 which contains a single 500 mA driver. The following page contains the performance graph for two parallel
FL500 chips as used in the LDTC1020.
An online tool for calculating your load line is at
http://www.teamwavelength.com/tools/calculator/soa/defaultld.htm
.
These values are determined from the specifi cations of the laser diode.
}
Graphs assume:
25°C Ambient
35°C Case
