MC34262, MC33262
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.
http://onsemi.com
POWER FACTOR
CONTROLLERS
MARKING
DIAGRAMS
8
Features
•
•
•
•
•
•
•
•
•
•
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
Pb−Free Packages are Available
Zero Current Detector
5
2.5V
Reference
Undervoltage
Lockout
Zero Current
Detect Input
VCC
PDIP−8
P SUFFIX
CASE 626
MC3x262P
AWL
YYWWG
8
1
1
8
3x262
ALYW
G
SOIC−8
D SUFFIX
CASE 751
8
1
1
x
A
WL, L
YY, Y
WW, W
G
G
= 3 or 4
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
= Pb−Free Package
8
PIN CONNECTIONS
Drive Output
7
Multiplier,
Latch,
PWM,
Timer,
&
Logic
Overvoltage
Comparator
+
4
Current Sense
Input
Voltage Feedback
Input
Compensation
Multiplier Input
Current Sense
Input
1
8 VCC
2
7 Drive Output
6 GND
5 Zero Current
Detect Input
3
4
(Top View)
1.08 Vref
ORDERING INFORMATION
Error Amp
Multiplier
Input 3
+
Multiplier
Vref
Quickstart
GND
6
Compensation
Voltage
Feedback
1 Input
See detailed ordering and shipping information in the package
dimensions section on page 17 of this data sheet.
2
Figure 1. Simplified Block Diagram
© Semiconductor Components Industries, LLC, 2005
November, 2005 − Rev. 9
1
Publication Order Number:
MC34262/D
