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Pspice Tutorial-RC time constant


  • Schematic

RC time constant: 1K * 1u = 1ms, Vc = V1 * [1 – exp(-t/RC)]

When t = 1RC, Vc = 0.63V1 = 3.15V;

When t = 2RC, Vc = 0.86V1 = 4.30V;

When t = 3RC, Vc = 0.95V1 = 4.75V;

Recommendation: A tool for calculating time constant

Device information:

Device
Model
Element
Signal source
V1
VPULSE/ SOURCE
Resistor
R1
R/ ANALOG
Capacitor
C1
C/ ANALOG
GND
0
 

Signal source description:

V1: Starting voltage
V2: Pulse voltage
TD: Delay time, set 1ms here for easy observation
TR: Rise time, set 0.5us here
TF: Fall time, no need to set
PW: Pulse width, no need to set, that is, the pulse width is unlimited
PER: Pulse period, no need to set

  • Simulation Results

Simulation settings:


Add Trace:


Add Toggle Curse, Mark Label, Text Label:


It can be seen that one time constant corresponds to a voltage of 3.1612V; two time constants correspond to a voltage of 4.3232V; three time constants correspond to a voltage of 4.7510V, which is similar to the theoretical calculation.








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