MC34262 Datasheet, PDF (1/16 Pages) ON Semiconductor – POWER FACTOR CONTROLLERS

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.
• Overvoltage Comparator Eliminates Runaway Output Voltage
• Internal Startup Timer
• One Quadrant Multiplier
• Zero Current Detector
• Trimmed 2% Internal Bandgap Reference
• Totem Pole Output with High State Clamp
• Undervoltage Lockout with 6.0 V of Hysteresis
• Low Startup and Operating Current
• Supersedes Functionality of SG3561 and TDA4817
Simplified Block Diagram
Zero Current Detector
2.5V
Reference
Undervoltage
Lockout
Zero Current
5 ^{Detect Input}
VCC
8
Order this document by MC34262/D
MC34262
MC33262
POWER FACTOR
CONTROLLERS
SEMICONDUCTOR
TECHNICAL DATA
8
1
P SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
PIN CONNECTIONS
Voltage Feedback
Input
1
Compensation 2
8 VCC
7 Drive Output
Multiplier Input 3
Current Sense ₄
Input
6 Gnd
5 ^{Zero Current}
Detect Input
(Top View)
Multiplier
Input ₃
Gnd 6
Multiplier,
Latch,
PWM,
Timer,
&
Logic
Multiplier
Overvoltage
Comparator
+
1.08 Vref
Error Amp
+
Vref
Quickstart
Compensation 2
MOTOROLA ANALOG IC DEVICE DATA
Drive Output
7
Current Sense
4 ^Input
Voltage
Feedback
1 Input
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC34262D
MC34262P
TA = 0° to +85°C
SO–8
Plastic DIP
MC33262D
SO–8
TA = – 40° to +105°C
MC33262P
Plastic DIP
© Motorola, Inc. 1996
Rev 1
1