title: Demystifying Switching Power Supplies (Demystifying Technology)
author:  Raymond A. Mack 
description: Mack takes you from the basics (v=Ldi/dt, plus buck, boost, inverting boost, buck-boost, and other supply circuit topologies) on through the details of passive component selection and semiconductor selection. Of particular note are his treatment of control circuits and their effect on ripple levels and electromagnetic compatibility. He provides a step-by-step test sequence for evaluating power-supply response using a variable load, an oscilloscope, and function generator. Mack concludes with two solid examples: a true sine-wave inverter uninterruptible power supply and a personal-computer power supply.<br /> Rick Nelson, Chief Editor, Test &amp; Measurement World, August 2006
zlib_text: www.linear.com
  October 2012 
  Volume 22 Number 3
  I N  T H I S  I S S U E
  Caption
  1A, low noise buck-boost 
  converter with 1.8V–5.5V 
  input voltage range  9 
  surge stopper with ideal 
  diode protects input and 
  output  12
  digital power system 
  management with analog 
  control loop for ±0.5% VOUT 
  accuracy  17 
  LED PWM dimming 
  simplified  34
  Real Power Density:  
  26A µModule Regulator  
  Keeps Cool in Tight Spaces
  Eddie Beville
  Each generation of high end processors, FPGAs and ASICs 
  demands more power, but even as power supplies are expected to 
  carry significantly heavier loads, they are given less board space to 
  do so. It is now common for POL (point-of-load) supplies to produce 
  multiple voltage rails at tens of amps to over a hundred amps at low, 
  ≤1V, output voltages, and in less space than the generation before. 
  Supplies that must support high load currents and fit in 
  tight spaces are often judged primarily on their power 
  density, or watts/cm2. Indeed, many of the latest pack-
  ag