NI SCC-CTR01 User Guide and Specifications
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Note
For most DAQ device counters, the default state is LOW, which results in the output
MOSFET being switched to ON. If you want to change the default state—for example, to
eliminate continuous power dissipation in the load during the idle state—consult your
DAQ documentation for information about how to change the default to HIGH and switch
the MOSFET to OFF.
Driving Inductive Loads
Caution
When the output of the NI SCC-CTR01 is used to drive an inductive load, high
voltages will appear suddenly because of the current switching through the inductor. To
prevent these high voltages from causing damage to the output circuit or the load, add
flyback diodes across your inductive load, as shown in Figure 5.
Figure 5.
Flyback Diodes on Inductive Load
Caution
Ensure the diode you choose is capable of handling the amount of current the load
is holding when the output is ON.
V
dd
V
dd
V
ss
V
ss
NI SCC-CTR01
Load
Out
Flyback
Diode
