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WEBENCH® Tools/LMR14206: Cboot: Voltage ?

Part Number: LMR14206

Tool/software: WEBENCH® Design Tools

Hello, 

on the Demoboards and in the Webbench Designer TI recomments for the Cboot-Capacitor Parts with max. voltages from 10V to 16V.  All Designs work with Inputvoltages greater 20V

The Cboot is connected to the SW-Output. At the SW-Output you measure voltage differences from appoximately  the Vin-Voltage, >20V. 

Questions: 

Which max. voltages  do you measure accross Cboot ? 

Should the max. voltage for the CB-Capacitor be greater than the voltage of Vin (example 35V or 50V) ?? 

Kind regards

Manfred