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34262P Schematic ( PDF Datasheet ) - Motorola Semiconductors

Teilenummer 34262P
Beschreibung MC34262
Hersteller Motorola Semiconductors
Logo Motorola Semiconductors Logo 




Gesamt 16 Seiten
34262P Datasheet, Funktion
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
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34262P Datasheet, Funktion
MC34262 MC33262
FUNCTIONAL DESCRIPTION
Introduction
With the goal of exceeding the requirements of legislation
on line–current harmonic content, there is an ever increasing
demand for an economical method of obtaining a unity power
factor. This data sheet describes a monolithic control IC that
was specifically designed for power factor control with
minimal external components. It offers the designer a simple,
cost–effective solution to obtain the benefits of active power
factor correction.
Most electronic ballasts and switching power supplies use
a bridge rectifier and a bulk storage capacitor to derive raw dc
voltage from the utility ac line, Figure 15.
Figure 15. Uncorrected Power Factor Circuit
Rectifiers
Converter
AC
Line
+
Bulk
Storage
Capacitor
Load
can be made to appear resistive to the ac line, thus
significantly reducing the harmonic current content.
Figure 16. Uncorrected Power Factor
Input Waveforms
Vpk
Rectified
DC
0
Line Sag
AC Line
Voltage
0
AC Line
Current
This simple rectifying circuit draws power from the line
when the instantaneous ac voltage exceeds the capacitor
voltage. This occurs near the line voltage peak and results in
a high charge current spike, Figure 16. Since power is only
taken near the line voltage peaks, the resulting spikes of
current are extremely nonsinusoidal with a high content of
harmonics. This results in a poor power factor condition
where the apparent input power is much higher than the real
power. Power factor ratios of 0.5 to 0.7 are common.
Power factor correction can be achieved with the use of
either a passive or an active input circuit. Passive circuits
usually contain a combination of large capacitors, inductors,
and rectifiers that operate at the ac line frequency. Active
circuits incorporate some form of a high frequency switching
converter for the power processing, with the boost converter
being the most popular topology, Figure 17. Since active
input circuits operate at a frequency much higher than that of
the ac line, they are smaller, lighter in weight, and more
efficient than a passive circuit that yields similar results. With
proper control of the preconverter, almost any complex load
The MC34262, MC33262 are high performance, critical
conduction, current–mode power factor controllers
specifically designed for use in off–line active preconverters.
These devices provide the necessary features required to
significantly enhance poor power factor loads by keeping the
ac line current sinusoidal and in phase with the line voltage.
Operating Description
The MC34262, MC33262 contain many of the building
blocks and protection features that are employed in modern
high performance current mode power supply controllers.
There are, however, two areas where there is a major
difference when compared to popular devices such as the
UC3842 series. Referring to the block diagram in Figure 19,
note that a multiplier has been added to the current sense
loop and that this device does not contain an oscillator. The
reasons for these differences will become apparent in the
following discussion. A description of each of the functional
blocks is given below.
Figure 17. Active Power Factor Correction Preconverter
Rectifiers
PFC Preconverter
Converter
AC
Line
High
+ Frequency
Bypass
Capacitor
MC34362
+
Bulk
Storage
Capacitor
Load
6
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MOTOROLA ANALOG IC DEVICE DATA

6 Page









34262P pdf, datenblatt
MC34262 MC33262
Figure 21. 450 W Universal Input Power Factor Controller
90 to 268 RFI
Vac Filter
2 C5
D2 D4
D1 D3
Zero Current
Detector
+
1.2V
+ 1.6V/
1.4V
2.5V
Reference
UVLO
36V
6.7V
+ 13V/
8.0V
Delay
Timer R
RS
Latch
16V
10
Drive
Output
10
100k
R6 1N4934
8 D6
+ 100
C4
5 22k
R4
T
MUR460
D5
VO
+ 400V/1.125A
7
MTW
20N50E
330
C3
Q1
1.3M
R5 Current Sense
Comparator
0.01 12k 3
C2 R3
20k 4
330
1.5V
Overvoltage
Comparator
10pF
0.001
Multiplier
+
1.08 Vref
10µA
Error
Amp
+
Vref
1
Quickstart
1.6M
R2
0.05
R7
10k
R1
62
0.68
C1
Power Factor Controller Test Data
AC Line Input
Vrms
90
Pin
489.5
PF
0.990
Ifund
5.53
Current Harmonic Distortion (% Ifund)
THD
2
3
5
7
2.2 0.10 1.5 0.25 0.83
VO(pp)
8.8
120 475.1 0.998 3.94 2.5 0.12 0.29 0.62 0.52
8.8
138 470.6 0.998 3.38 2.1 0.06 0.70 1.1 0.41
8.8
180 463.4 0.998 2.57 4.1 0.21 2.0
1.6 0.71
8.9
240 460.1 0.996 1.91 4.8 0.14 4.3
2.2 0.63
8.9
268 459.1 0.995 1.72 5.8 0.10 5.0
2.5 0.61
8.9
This data was taken with the test set–up shown in Figure 24.
T = Coilcraft P3657–A
Primary: 38 turns Litz wire, 1300 strands of #48 AWG, Kerrigan–Lewis, Chicago, IL
Secondary: 3 turns of # 20 AWG
Core: Coilcraft PT4220, EE 42–20
Gap: 0.180total for a primary inductance (LP) of 190 µH
Heatsink = AAVID Engineering Inc. 604953B04000 Extrusion
DC Output
VO IO PO
395.5 1.14 450.9
395.5 1.14 450.9
395.5 1.14 450.9
395.5 1.14 450.9
395.5 1.14 450.9
395.5 1.14 450.9
η(%)
92.1
94.9
95.8
97.3
98.0
98.2
12
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MOTOROLA ANALOG IC DEVICE DATA

12 Page





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