6 Tutorial
Connecting the Load
160 E3632A User’s Guide
A large load capacitor may cause the power supply to cross
into CC or unregulated mode momentarily when the output
voltage is reprogrammed. The slew rate of the output
voltage will be limited to the current setting divided by the
total load capacitance (internal and external).
Inductive loading
Inductive loads present no loop stability problems in
constant voltage mode. In 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 CC mode or
unregulated mode for brief periods.
Table 6 - 2 Slew rate
Internal
capacitance
Internal bleed
resistor
Slew rate at no load and
full scale current setting
470 F5 K 1.5 V/ms
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