Because even modest design changes can cause a supply to fail FCC/CE tests for conducted and radiated noise, designers need to understand
where noise originates and how to reduce it to acceptable levels.
Inductors dissipate power in the core and in thewindings. Although exact calculations of theselosses can be complex and difficult, they can bereadily estimated using data sheet parametersavailable from magnetic component suppliers.
With the California Energy Commission mandating
minimum levels of efficiency for external power supplies sold in the state, many linear
supplies will need to be redesigned using switch-mode technology.
The synchronous buck converter in Fig. 1 is the most popular topology in the PC market. The race between the top MOSFET companies is heating up with the rush to design new devices that are faster and better suited to meet the demands of the...