MC34261 Datasheet, PDF (1/12 Pages) Motorola, Inc – POWER FACTOR CONTROLLERS

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