Temperature Sweep — Linear Regulator

A temperature sweep can be used in conjunction with most of the analyses. Here we will show how temperature affects the performance of a linear voltage regulator. Create the circuit shown below  

Oread Capture - Lite Edition [/ (SCHEMATIC 1 PAGF1)j 

Node label Node label Ideal XFMR Vo/Vin D1N5401 

This circuit is a bridge rectifier followed by a filter capacitor to produce a DC voltage with ripple at Vin. Connected to Vin is a linear regulator made from a Zener voltage reference and an NPN pass transistor. We will first run a Transient Analysis to see the operation of the circuit at room temperature (27°C). To set up a Transient Analysis, select PSpice and then New Simulation Profile from the Capture menus, enter a name for the profile and then click the Create button. By default the Time Domain (Transient) Analysis type is selected. Fill in the parameters as shown in the Time Domain dialog box below  

We will zoom in on the Vo trace to see it more closely. Use the cursors to find the magnitude of the ripple. 

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