Wavelength Electronics PLD K-CH Series, Техническое описание и руководство по эксплуатации, Страница: 21 / 24

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PLDXK-CH SERIES LASER DIODE DRIVER
TROUBLESHOOTING
PROBLEM POTENTIAL CAUSES SOLUTIONS
Driver will not switch on Improperly configured power
supply
Carefully check the wiring diagram according to Table 3 .
Output will not enable Remote Enable signal is not
correct
Refer to the LD Enable specifications in Table 1 and make sure your
input enable signal is correct.
Laser output power too
low in Constant Current
mode
Laser current setpoint too low Increase the setpoint either by adjusting the OUT ADJUST trimpot
clockwise, or by increasing the signal voltage on ANALOG IN (pin
J3:5).
Laser current limit too low Refer to page 13 for instructions on setting the laser driver current
limit.
Laser driver is compliance
limited
Check the laser diode specifications to determine the forward
voltage (V
F
). Make sure that the PLDxK-CH is not compliance
limited. Refer to the Electrical Specifications table on
page 6.
If
the driver is compliance limited, V
LD ANODE
may need to be increased.
Verify that the PLDxK-CH will be operating within the Safe
Operating Area if V
LD ANODE
is increased.
Laser does not reach
desired output in
Constant Power mode
Current limit too low Check the laser diode datasheet to determine the approximate laser
drive current at the desired optical power output level. Then verify
that the current limit is set slightly higher than that. See page 13
for instructions on setting the laser driver current limit.
Photodiode feedback current
is out of range for the
PLDxK-CH
Refer to the laser diode datasheet to determine the approximate
photodiode (PD) current at the desired output power level. If the PD
current exceeds the PLDxK-CH PD current range, set the PD Range
switch to High Range; see page 13 .