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MC33260DR2ONN/a4912avaiGreenLine™ Compact Power Factor Controller: Innovative Circuit for Cost Effective Solutions
MC33260PMCN/a80avaiGreenLine™ Compact Power Factor Controller: Innovative Circuit for Cost Effective Solutions
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MUR460ONN/a25000avai600V; 40A super-fast rectifier. Ideally suited for automated assembly
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1N4007RL-1N4937-1N5406-MC33260DR2-MC33260P-MUR460
GreenLine™ Compact Power Factor Controller: Innovative Circuit for Cost Effective Solutions
AND8016/D
Design of Power Factor
Correction Circuit Using
Greenline Compact Power
Factor Controller MC33260
Prepared by
Ming Hian Chew

ON Semiconductor Analog Applications Engineering
Introduction

The MC33260 is an active power factor controller that
functions as a boost pre–converter which, meeting
international standard requirement in electronic ballast and
off–line power supply application. MC33260 is designed to
drive a free running frequency discontinuous mode, it can
also be synchronized and in any case, it features very
effective protections that ensure a safe and reliable
operation.
This circuit is also optimized to offer extremely compact
and cost effective PFC solutions. It does not entail the need
of auxiliary winding for zero current detection hence a
simple coil can be used instead of a transformer if the
MC33260 Vcc is drawn from the load (please refer to page
19 of the data sheet). While it requires a minimum number
of external components, the MC33260 can control the
follower boost operation that is an innovative mode
allowing a drastic size reduction of both the inductor and the
power switch. Ultimately, the solution system cost is
significantly lowered.
Also able to function in a traditional way (constant output
voltage regulation level), any intermediary solutions can be
easily implemented. This flexibility makes it ideal to
optimally cope with a wide range of applications.
This application note will discuss on the design of power
factor correction circuit with MC33260 with
boost constant output voltage regulation level operation and
follower boost variable output voltage regulation level
operation. For derivation of the design equations related to
the IC please refer to MC33260 data sheet.
Figure 1. Application Schematic of MC33260
PFC Techniques

Many PFC techniques have been proposed, boost
topology, which can operate in continuous and
discontinuous mode, is the most popular. Typically,
continuous mode is more favorable for high power
application for having lower peak current. On the other
hand, for less than 500 W application, discontinuous mode
cost. This paper will discuss design of PFC with MC33260,
which operates in critical conduction mode.
Discontinuous Conduction Mode Operation

Critical conduction mode operation presents two major
advantages in PFC application. For critical conduction
mode, the inductor current must fall to zero before start the
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