MC34261P View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MC34261P

POWER FACTOR CONTROLLERS

Motorola => Freescale 

Power Factor Controllers

The MC34261/MC33261 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, a one quadrant multiplier for near unity power factor, zero current

detector to ensure critical conduction operation, high gain error amplifier,

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 input undervoltage

lockout with hysteresis, cycle–by–cycle current limiting, and a latch for single

pulse metering. These devices are available in dual–in–line and surface

mount plastic packages.

• Internal Startup Timer

• One Quadrant Multiplier

• Zero Current Detector

• Trimmed 2% Internal Bandgap Reference

• Totem Pole Output

• Undervoltage Lockout with Hysteresis

• Low Startup and Operating Current

• Pinout Equivalent to the SG3561

• Functional Equivalent to the TDA4817

Order this document by MC34261/D

MC34261

MC33261

POWER FACTOR

CONTROLLERS

SEMICONDUCTOR

TECHNICAL DATA

8

1

P SUFFIX

PLASTIC PACKAGE

CASE 626

8

1

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO–8)

Simplified Block Diagram

Zero Current Detector

2.5V

Reference

Undervoltage

Lockout

Zero Current

5 Detect Input

VCC

8

PIN CONNECTIONS

Voltage Feedback

Input

1

Compensation 2

8 VCC

7 Drive Output

Multiplier Input 3

Current Sense

Input

4

6 Gnd

5

Zero Current

Detect Input

(Top View)

Multiplier

Input 3

Gnd 6

Multiplier,

Latch,

PWM,

Timer,

&

Logic

Drive Output

7

Current Sense

4 Input

Multiplier

Error Amp Vref

Compensation 2

Voltage

Feedback

1 Input

ORDERING INFORMATION

Device

Operating

Temperature Range

Package

MC34261D

MC34261P

TA = 0° to +70°C

SO–8

Plastic DIP

MC33261D

TA = – 40° to +85°C

MC33261P

SO–8

Plastic DIP

MOTOROLA ANALOG IC DEVICE DATA

© Motorola, Inc. 1996

Rev 1

1

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