MC34261 Datasheet, PDF (1/13 Pages) Motorola, Inc – POWER FACTOR CONTROLLERS

MC34261, MC33261
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
Simplified Block Diagram
http://onsemi.com
POWER FACTOR
CONTROLLERS
SEMICONDUCTOR
TECHNICAL DATA
8
1
P SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO−8)
Zero Current Detector
Zero Current
5 ^{Detect Input}
PIN CONNECTIONS
2.5V
Reference
Undervoltage
Lockout
Multiplier
Input ₃
Gnd 6
Multiplier,
Latch,
PWM,
Timer,
&
Logic
Multiplier
Error Amp ^Vref
Compensation 2
V_CC
8
Drive Output
7
Current Sense
4 ^Input
Voltage
Feedback
1 Input
Voltage Feedback
Input
1
Compensation 2
8 V_CC
7 Drive Output
Multiplier Input 3
Current Sense
Input
4
6 Gnd
5
Zero Current
Detect Input
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC34261D
MC34261P
MC33261D
MC33261P
T_A = 0° to +70°C
T_A = − 40° to +85°C
SO−8
Plastic DIP
SO−8
Plastic DIP
© Semiconductor Components Industries, LLC, 2006
1
July, 2006 − Rev. 3
Publication Order Number:
MC34261/D