lda1-cp1-d Analog Technology, Inc., lda1-cp1-d Datasheet - Page 3

• Manufacturer Part Number: lda1-cp1-d
• Description: Dual Mode Laser Driver
• Manufacturer: Analog Technology, Inc.

Connect LPS to the 2.5V reference (pin 5), or turn the POT
W2 all way up, see Figure 4. Adjust R1 slowly till the mode
monitor pin is pulled up, indicating a constant power mode,
and the LIO pin indicating the output current equals the
normal operating current, i.e.:
If you have an optical power meter, check the output power
if see if it matches the desired the power. If not, adjust R1 till
the output laser power equals the desired value. Measure of
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LIO = 2.5V × 0.2A/2A = 0.25V.
Analog Technologies
Figure 4 A Typical Self-contained Application Schematic
Figure 5 A Typical Micro-processor Based Application
the output current after this step, set the protection current to
1.2 times of this current, i.e., set
when the laser is outputting the desired power. The laser is
now operating at a constant power mode. When the
temperature changes for too much, after years’ operation, or
by some fault, the laser may be turned to current mode. Even
at that time, the laser will at most be receiving 1.2 times the
NOC, which will not damage the laser.
LIS = 1.2 × LIO
Dual Mode Laser Driver
LDA1-CP1
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