MC33260P datasheet(9/22 Pages) ONSEMI

Part #	MC33260P

Description	GreenLine TM Compact Power Factor Controller: Innovative Circuit for Cost Effective Solutions

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MC33260

http://onsemi.com

9

FUNCTIONAL DESCRIPTION

Pin Numbers are Relevant to the PDIP−8 Version

INTRODUCTION

The need of meeting the requirements of legislation on

line current harmonic content, results in an increasing

demand for cost effective solutions to comply with the

Power Factor regulations. This data sheet describes a

monolithic controller specially designed for this purpose.

Most off−line appliances use a bridge rectifier associated

to a huge bulk capacitor to derive raw dc voltage from the

utility ac line.

Figure 22. Typical Circuit Without PFC

Load

Converter

Rectifiers

Bulk

Storage

Capacitor

+

AC

Line

This technique results in a high harmonic content and in

poor power factor ratios. In effect, the simple rectification

technique draws power from the mains when the

instantaneous ac voltage exceeds the capacitor voltage. This

occurs near the line voltage peak and results in a high charge

current spike. Consequently, a poor power factor (in the

range of 0.5 − 0.7) is generated, resulting in an apparent input

power that is much higher than the real power.

Figure 23. Line Waveforms Without PFC

Line Sag

Rectified DC

AC Line Voltage

AC Line Current

0

Vpk

Active solutions are the most popular way to meet the

legislation requirements. They consist of inserting a PFC

pre−regulator between the rectifier bridge and the bulk

capacitor. This interface is, in fact, a step−up SMPS that

outputs a constant voltage while drawing a sinusoidal

current from the line.

Figure 24. PFC Preconverter

Converter

Rectifiers

+

AC

Line

PFC Preconverter

The MC33260 was developed to control an active solution

with the goal of increasing its robustness while lowering its

global cost.

OPERATION DESCRIPTION

The MC33260 is optimized to just as well drive a free

running as a synchronized discontinuous voltage mode.

It also features valuable protections (overvoltage and

undervoltage protection, overcurrent limitation, ...) that

make the PFC preregulator very safe and reliable while

requiring very few external components. In particular, it is

able to safely face any uncontrolled direct charges of the

output capacitor from the mains which occur when the

output voltage is lower than the input voltage (startup,

overload, ...).

In addition to the low count of elements, the circuit can

control an innovative mode named “Follower Boost” that

permits to significantly reduce the size of the preconverter

inductor and power MOSFET. With this technique, the

output regulation level is not forced to a constant value, but

can vary according to the a.c. line amplitude and to the

power. The gap between the output voltage and the ac line

is then lowered, what allows the preconverter inductor and

power MOSFET size reduction. Finally, this method brings

a significant cost reduction.

A description of the functional blocks is given below.

REGULATION SECTION

Connecting a resistor between the output voltage to be

regulated and the Pin 1, a feedback current is obtained.

Typically, this current is built by connecting a resistor

between the output voltage and the Pin 1. Its value is then

given by the following equation:

I

pin1 +

Vo * Vpin1

Ro

where:

Ro is the feedback resistor,

Vo is the output voltage,

Vpin1 is the Pin 1 clamp value.

The feedback current is compared to the reference current

so that the regulation block outputs a signal following the

characteristic depicted in Figure 25. According to the power

and the input voltage, the output voltage regulation level

varies

between

two

values

(Vo)regL and (Vo)regH

corresponding to the IregL and IregH levels.

Figure 25. Regulation Characteristic

1.5 V

Regulation Block Output

Io

IregL

(97%Iref)

IregH

(Iref)

The feedback resistor must be chosen so that the feedback

current should equal the internal current source IregH when

the output voltage exceeds the chosen upper regulation

voltage [(Vo)regH].

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