降压开关稳压器手册

A substanTIal percentage of regulator requirements

involve stepping down the primary voltage. Although

linear regulators can do this, they cannot achieve the

effi ciency of switching based approaches1. The theory

supporTIng step-down (“buck”) switching regulaTIon is

well established, and has been exploited for some TIme.

Convenient, easily applied ICs allowing implementation

of practical circuits are, however, relatively new.