18
Test Load
For the first test, an appropriate test load may be assembled instead of the laser
diode. This test load can either be a short circuit or a dummy diode load. Please
connect the test load only between anode and cathode (LD+ and LD-) and prevent
contacts to any other parts of the circuit.
Power Supply
The power supply must be able to cover the output power plus the internal power
losses (please see next section).
Crowbar
After supplying the LDP-CWL XX-20 with appropriate voltage source, the red LED
of the crowbar will be on, indicating that the crowbar is active. At this point there
can be no output current flowing. To activate the output current so that it can the
output current set pin (10. pin of the pin header) crowbar has to be toggled (set
low and then high) (7. pin of the pin header).
For inherent protection, the LDP-CWL automatically shuts down itself if an error
occurs. Firstly
if temperature rises above 80 °C
, secondly
if no load is connected
and thirdly
if the output current is higher than the set current
. This condition is
latched
. To re-enable the LDP-CW the ENABLE pin must be toggled (set low and
then high).
Current Limiter
The LDP-CWL XX-20 is equipped with a current limiter. This can be used to
configure a maximum valid current set point which cannot be overstepped. To
configure the maximum output current use the measuring point 1 (MP1) on the
PCB (See Picture 1). The scaling of the current limiter is
3 A/V
and can be set by
the potentiometer. If you want to disable the current limiter then set the voltage
to 3 V. Watch out because you might damage or destroy your load.
Summary of Contents for LDP-CWL 06-20
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