Basic Calculation of a Boost Converter's Power Stage (Rev. C)
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V
IN
V
OUT
I
IN
I
OUT
C
IN
C
OUT
L
D
SW
Application Report
SLVA372C–November 2009–Revised January 2014
Basic Calculation of a Boost Converter's Power Stage
Brigitte Hauke ......................................................................................... Low Power DC/DC Application
ABSTRACT
This application note gives the equations to calculate the power stage of a boost converter built with an IC
with integrated switch and operating in continuous conduction mode. It is not intended to give details on
the functionality of a boost converter (see Reference 1) or how to compensate a converter. See the
references at the end of this document if more detail is needed.
For the equations without description, See section 8.
1 Basic Configuration of a Boost Converter
Figure 1 shows the basic configuration of a boost converter where the switch is integrated in the used IC.
Often lower power converters have the diode replaced by a second switch integrated into the converter. If
this is the case, all equations in this document apply besides the power dissipation equation of the diode.
Figure 1. Boost Converter Power Stage
1.1 Necessary Parameters of the Power Stage
The following four parameters are needed to calculate the power stage:
1. Input Voltage Range: V
IN(min)
and V
IN(max)
2. Nominal Output Voltage: V
OUT
3. Maximum Output Current: I
OUT(max)
4. Integrated Circuit used to build the boost converter. This is necessary, because some parameters for
the calculations have to be taken out of the data sheet.
If these parameters are known the calculation of the power stage can take place.
1
SLVA372C–November 2009–Revised January 2014 Basic Calculation of a Boost Converter's Power Stage
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