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LDDEVALP Datasheet(PDF) 13 Page - Wavelength Electronics, Inc.

No. de pieza LDDEVALP
Descripción Electrónicos  Low Noise Laser Diode Drivers
PDF  28 Pages
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Fabricante Electrónico  WAVELENGTH [Wavelength Electronics, Inc.]
Página de inicio  https://www.teamwavelength.com/
Logo WAVELENGTH - Wavelength Electronics, Inc.

LDDEVALP Datasheet(HTML) 13 Page - Wavelength Electronics, Inc.

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13
LDD P SERIES LASER DIODE DRIVER
adjusT LaseR diode cuRRenT Via moduLaTion (oPTionaL)
There are two ways to utilize the Modulation Input to adjust
the laser diode current remotely:
•
Connect an external trimpot or potentiometer to pin 3.
See upper half of
Figure 15.
•
Connect a signal generator to pin 3. See lower half of
Figure 15.
External
Trimpot
V+ (pin 8)
Bandgap
Voltage
Reference
CURRENT
FEEDBACK
CURRENT
MONITOR
MODULATION
GND
1
2
3
4
CURRENT
FEEDBACK
CURRENT
MONITOR
MODULATION
GND
1
2
3
4
Signal
Generator
Ground
+
-
Figure 15. Two separate ways to control the laser diode
current remotely.
Upper: External Trimpot connected to pin 3.
Lower: Signal Generator connected to pin 3.
The modulation input adjusts the laser diode current by
reducing the laser diode current from the setting determined
by the Output Current Adjust trimpot proportional to the
voltage applied to pin 3.
The modulation current (I
MOD) is given by Equation 4.
Equation 4. I
MOD = IOP + VPIN3 (TFMOD )
where TF
MOD is the laser diode transfer function found in
Table 3. Recall that TF
MOD is negative.
CAUTION: The modulation input voltage must always be
maintained within the power supply voltage range between
pin 8 and pin 4. A voltage on the modulation input below
ground may produce excessive laser diode currents.



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