The Shunt regulator library is one of the component library types within the Component Library included in PI Expert. Once a Shunt Regulator IC is added to the library and included in a Component Set, you can manually choose your custom Shunt regulator IC to be used where applicable. Shunt regulator IC’s are used as voltage references for secondary side feedback. Typical shunt regulators use either a 1.25 V or a 2.5 V reference. Both types have a built in error amplifier with high gain. The 1.25 V parts must be used for lower output voltages or where no load consumption is critical as these parts require a smaller bias current as compared to the 2.5 V solutions.
PI Expert does not allow you to modify or delete the default components. You can only view the parameters of a selected component type by clicking the View button. You can add custom components to the Component Library by clicking the Add button in the Component Library dialog where you can input all relevant specifications for a particular component. See the Component Library topic for more information on adding and editing components.
To add a Shunt Regulator, you can specify the following parameters
Rated Voltage – Maximum anode to cathode voltage that the part can sustain
Error Amplifier Gain – Open loop gain of error amplifier in dB
Tolerance – Tolerance of reference voltage (usually between 0.5% to 2%)
Part Number – Manufacturer part number
Manufacturer – Name of manufacturer
Package – Package in which shunt regulator is assembled (usually TO-92)