(MC33261 / MC34261) POWER FACTOR CONTROLLERS
Description
Order this document by MC34261/D
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
MC34261 MC33261
POWER FACTOR CONTROLLERS
SEMICONDUCTOR TECHNICAL DATA
• • • • • • • •
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
8 1 8 1
P SUFFIX PLASTIC PACKAGE CASE 626
D SUFFIX PLASTIC PACKAGE CASE 751 (SO–8)
PIN CONNECTIONS Simplified Block Diagram
Voltage Feedback Input Compensation Multiplier Input Current Sense Input 1 2 3 4 (Top View) 8 VCC 7 Drive Output 6 Gnd 5 Zero Current Detect Input
Zero Current Detector 5
Zero Current Detect Input
2.
5V Reference
Undervoltage Lockout
VCC 8
Drive Output Multiplier, Latch, PWM, Timer, & Logic 7 Current Sense Input
4
ORDERING INFORMATION
Device Voltage Feedback 1 Input Compensation 2 MC34261D MC34261P MC33261D MC33261P Operating Temperature Range TA = 0° to +70°C TA = – 40° to +85°C Package SO–8 Plastic DIP SO–8 Plastic DIP
Rev 1
Error Amp Multiplier Input 3 Gnd 6 Multiplier
Vref
© Motorola, Inc.
1996
MOTOROLA ANALOG IC DEVICE DATA
1
MC34261 MC33261
MAXIMUM RATINGS
Rating Total Powe...
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