Getting Started 1
Output Connections
E364xA User’s and Service Guide 25
Inductive loading
Inductive loads present no loop stability problems in the
constant voltage mode. In the constant current mode,
inductive loads form a parallel resonance with the power
supply’s output capacitor. Generally this will not affect the
stability of the power supply, but it may cause ringing of the
current in the load.
Pulse loading
In some applications, the load current varies periodically
from a minimum to a maximum value. The constant current
circuit limits the output current. Some peak loading
exceeding the current limit can be obtained due to the
output capacitor. To stay within the specifications for the
output, the current limit should be set greater than the peak
current expected or the supply may go into the CC mode or
unregulated mode for brief periods.
Reverse current loading
An active load connected to the power supply may actually
deliver a reverse current to the supply during a portion of
its operating cycle. An external source can not be allowed to
pump current into the supply without risking loss of
regulation and possible damage.
These effects can be avoided by pre- loading the output with
a dummy load resistor. The dummy load resistor should
draw at least the same amount of current from the supply
as the active load may deliver to the supply. The value of
the current for the dummy load plus the value of the
current the load draws from the supply must be less than
the maximum current of the supply.
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