19 DC to DC ConvertersThis type falls under the category of switching power supplies.Switching is controlled by Pulse Width Modulation.Popular because of high efficiency and high power density.Obtain higher, lower, or inverting DC voltages.Three main types of converters:Buck RegulatorBoost RegulatorInverting RegulatorOther Configurations
20 DC to DC Converters Buck Regulator The most commonly used switching converter is the Buck, which is used to down-convert a DC voltage to a lower DC voltage of the same polarity.This is essential in systems that use distributed power rails (like 24V to 48V), which must be locally converted to 15V, 12V or 5V with very little power loss.
23 DC to DC Converters BOOST REGULATOR The Boost regulator takes a DC input voltage and produces a DC output voltage that is higher in value than the input (but of the same polarity).The Boost regulator is shown in Figure 31, along with details showing the path of current flow during the switch on and off time.
25 DC to DC Converters BUCK-BOOST (INVERTING) REGULATOR The Buck-Boost or Inverting regulator takes a DC input voltage and produces a DC output voltage that is opposite in polarity to the input.The negative output voltage can be either larger or smaller in magnitude than the input voltage.
27 DC to DC Converters FLYBACK REGULATOR The Flyback is the most versatile of all the topologies, allowing the designer to create one or more output voltages, some of which may be opposite in polarity.Flyback converters have gained popularity in battery-powered systems, where a single voltage must be converted into the required system voltages (for example, +5V, +12V and -12V) with very high power conversion efficiency.