and select Change. The Upper Feedback Resistor dialog box opens. In this dialog click the calculator icon to edit the Resistance, Tolerance and Rated Power value.Bias winding feedback may be selected using the Design Options form. This feedback scheme is only available for designs based on the LinkSwitch-XT product family. Bias winding regulation is very inexpensive to implement since it does not require an optocoupler and can realize about +/–10% regulation of the output voltage over variations in line and load. PI Expert always selects a standard recovery diode for the bias winding rectifier when Bias Winding is selected as the feedback type.
For this feedback type you only can modify the RF2 value. In the Component box click the black down arrow control on the right of the calculator icon and select Change. The Upper Feedback Resistor dialog box opens. In this dialog click the calculator icon to edit the Resistance, Tolerance and Rated Power value.