.You can open the PI Device Selection form by clicking on the device in the Schematic tab, using the navigation tree or through the toolbar or the Active Design menu.
PI Expert automatically chooses the best possible device for the design depending on the optimization type used and your specifications. When optimization has completed successfully in the PI Device Selection form the automatically chosen device is marked with the target icon .
You can manually select a device for your design for both a manual and automated designs, assuming that the device is larger than the device already chosen by PI Expert during optimization. To select a device:
Click the row of the device you want to select.
The user selected icon 
appears to indicate a manual selection.
If you choose to optimize the design with your manual device selection present, the optimization process will give design results using only the device you have selected.
If you would like to revert back to the device chosen during optimization:
Click the Auto Pick button.
The auto pick icon 
will appear in the row of the device PI Expert has chosen.
Optimize the design. You need to optimize the design because the auto pick feature selects the device based on the datasheet specified output power and not the specific applications like the optimization process does.