Wavelength Electronics PLD10000, Техническое описание и руководство по эксплуатации

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PLD10000/PLD12500 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
. Make sure the
polarity of the power supply is correct.
Output will not enable Remote Enable signal is not
correct
Refer to the LD Enable specifications in Table 1 and make sure the
LD ENABLE (pin 22) signal is correct.
Laser output power too low in
Constant Current mode
Laser current setpoint too low Increase the setpoint either by adjusting the I OUT ADJ trimpot clockwise, or
by increasing the signal voltage on the Analog Input (pin 16).
Laser current limit set too low Refer to
page 11
for instructions on setting the laser driver current limit.
Laser drive is compliance limited Check the laser diode specifications to determine the forward voltage (V
F
).
Make sure that the PLD is not compliance limited. Refer to the Electrical
Specifications table on page 5. If the driver is compliance limited,
V
LD Anode
(pins 7, 8, 9) may need to be increased. Verify that the PLD will
be operating within the Safe Operating Area if the supply voltage is
increased.
Laser does not reach desired
output in Constant Power
mode
Current limit set 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. Refer to
page 11
for instructions on
setting the laser driver current limit.
Photodiode feedback current is
out of range for the PLD
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
PLD PD current range, set the PD Range switch to High Range (Type A/B
laser diodes only.)
Voltage drop across cables is too
high
At high currents the voltage drop across the transmission wires may
become an issue. The excessive voltage drop may result in the driver being
compliance voltage limited before the drive current setpoint is reached. Use
large-gauge wires, and keep the wires as short as possible.