lda1-cp2 Analog Technology, Inc., lda1-cp2 Datasheet - Page 3

• Manufacturer Part Number: lda1-cp2
• 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.
Place a main pole to stabilize the power control loop by
adding the capacitor C1 in parallel with the resistor R1, see
Figure 4 and 5. The relationship between R1 and C1 is:
where, τ is constant, 200μs.This pole needs to be of much
lower in frequency than all the poles within the power
control loop. The value of C1 is up to adjust R1 slowly till
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τ = R1 × C1 = 200μs,
Analog Technologies
Figure 4 A Typical Self-contained Application Schematic
Figure 5 A Typical Micro-processor Based Application
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
the output current after this step, set the protection current to
1.2 times of this current, i.e., set
LIO = 2.5V × 0.2A/2A = 0.25V.
Dual Mode Laser Driver
LDA1-CP2
3