Programming instructions

Source Components
Multisim Component Reference Guide 1-38 ni.com
Characteristic Equation
Voltage Limiter Parameters and Defaults
1.36 Current Limiter Block
This component models the behavior of an operational amplifier or comparator at a high level
of abstraction. All of its pins act as inputs; three of them also act as outputs. The component
takes as input a voltage value from the “in” connector. It then applies the offset and gain, and
derives from it an equivalent internal voltage, Veq, which it limits to fall between the positive
and negative power supply inputs. If Veq is greater than the output voltage seen on the “out”
connector, a sourcing current will flow from the output pin. Otherwise, if Veq is less than the
output voltage, a sinking current will flow into the output pin.
Depending on the polarity of the current flow, either a sourcing or a sinking resistance (Rsrc
or Rsnk) value is applied to govern the output voltage/output current relationship. The chosen
resistance will continue to control the output current until it reaches a maximum value
Symbol Parameter Name Default Unit
VIoff Input offset voltage 0 V
KGain 1V/V
Vl Output voltage lower limit 0 V
Vu Output voltage upper limit 1 V
Vs Upper and lower limit smoothing range 1e-06 V
VKVV VVV
VV VV
VV VV
OUT in Ioff out
OUT OUT
OUT OUT
=+ ≤≤
=>
=<
()
max
max max
min min
for
for
for
min
ComponentRef.book Page 38 Thursday, December 7, 2006 10:12 AM