MC34262

MC33262

SEMICONDUCTOR

TECHNICAL DATA

POWER FACTOR

CONTROLLERS

PIN CONNECTIONS

Order this document by MC34262/D

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO–8)

8

1

8

1

P SUFFIX

PLASTIC PACKAGE

CASE 626

Voltage Feedback

Input

1

2

3

4

8

7

6

5

(Top View)

Compensation

Multiplier Input

Current Sense

Input

VCC

Drive Output

Gnd

Zero Current

Detect Input

Device

Operating

Temperature Range

Package

ORDERING INFORMATION

MC34262D

MC34262P

TA = 0° to +85°C

SO–8

Plastic DIP

MC33262D

MC33262P

SO–8

Plastic DIP

TA = – 40° to +105°C

1

MOTOROLA ANALOG IC DEVICE DATA

Power Factor Controllers

The MC34262/MC33262 are active power factor controllers specifically

designed for use as a preconverter in electronic ballast and in off–line power

converter applications. These integrated circuits feature an internal startup

timer for stand–alone applications, a one quadrant multiplier for near unity

power factor, zero current detector to ensure critical conduction operation,

transconductance error amplifier, quickstart circuit for enhanced startup,

trimmed internal bandgap reference, current sensing comparator, and a

totem pole output ideally suited for driving a power MOSFET.

Also included are protective features consisting of an overvoltage

comparator to eliminate runaway output voltage due to load removal, input

undervoltage lockout with hysteresis, cycle–by–cycle current limiting,

multiplier output clamp that limits maximum peak switch current, an RS latch

for single pulse metering, and a drive output high state clamp for MOSFET

gate protection. These devices are available in dual–in–line and surface

mount plastic packages.

Simplified Block Diagram

Voltage

Feedback

Input

Multiplier,

Latch,

PWM,

Timer,

&

Logic

Error Amp

Multiplier

Undervoltage

Lockout

2.5V

Reference

Zero Current Detector

5

8

6

7

4

3

2

1

Drive Output

Gnd

Zero Current

Detect Input

Multiplier

Input

Compensation

VCC

Current Sense

Input

Overvoltage

Comparator

+

1.08 Vref

+

Vref

Quickstart

© Motorola, Inc. 1996

Rev 1