chapter eighteen

Case Study 3: DC-DC Power Converter

With a contribution by

Tom Egel,     Mentor Graphics Corporation

This case study illustrates how VHDL-AMS can be used for the detailed design of a DC-DC switching power supply. For the RC airplane system, a step-down converter is required to convert the 42 V battery voltage used to power the propeller motor to the 4.8 V needed for the on-board servo electronics. In this case study we briefly introduce switched-mode power supply theory, and then perform a detailed design of a simple step-down (buck) converter. We discuss averaging techniques that facilitate analysis of the closed-loop system and use VHDL-AMS simulations to perform system-level design tradeoffs.

18.1 Buck Converter Theory ...

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