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34262P の電気的特性と機能

34262PのメーカーはMotorola Semiconductorsです、この部品の機能は「 MC34262」です。


製品の詳細 ( Datasheet PDF )

部品番号 34262P
部品説明 MC34262
メーカ Motorola Semiconductors
ロゴ Motorola Semiconductors ロゴ 




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34262P Datasheet, 34262P PDF,ピン配置, 機能
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
www.DataSheet.in

1 Page





34262P pdf, ピン配列
MC34262 MC33262
ELECTRICAL CHARACTERISTICS (VCC = 12 V (Note 2), for typical values TA = 25°C, for min/max values TA is the operating ambient
temperature range that applies (Note 3), unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max Unit
CURRENT SENSE COMPARATOR
Input Bias Current (VPin 4 = 0 V)
Input Offset Voltage (VPin 2 = 1.1 V, VPin 3 = 0 V)
Maximum Current Sense Input Threshold (Note 5)
Delay to Output
DRIVE OUTPUT
IIB
VIO
Vth(max)
tPHL(in/out)
1.3
– 0.15
9.0
1.5
200
–1.0 µA
25 mV
1.8 V
400 ns
Output Voltage (VCC = 12 V)
Low State (ISink = 20 mA)
Low State (ISink = 200 mA)
High State (ISource = 20 mA)
High State (ISource = 200 mA)
V
VOL
0.3
0.8
— 2.4 3.3
VOH
9.8
10.3
7.8 8.4
Output Voltage (VCC = 30 V)
High State (ISource = 20 mA, CL = 15 pF)
Output Voltage Rise Time (CL = 1.0 nF)
Output Voltage Fall Time (CL = 1.0 nF)
Output Voltage with UVLO Activated
(VCC = 7.0 V, ISink = 1.0 mA)
RESTART TIMER
VO(max)
tr
tf
VO(UVLO)
14
V
16 18
50 120 ns
50 120 ns
0.1 0.5 V
Restart Time Delay
UNDERVOLTAGE LOCKOUT
tDLY
200
620
µs
Startup Threshold (VCC Increasing)
Vth(on)
11.5
13
14.5 V
Minimum Operating Voltage After Turn–On (VCC Decreasing)
VShutdown
7.0
8.0
9.0 V
Hysteresis
VH 3.8 5.0 6.2 V
TOTAL DEVICE
Power Supply Current
Startup (VCC = 7.0 V)
Operating
Dynamic Operating (50 kHz, CL = 1.0 nF)
ICC
Power Supply Zener Voltage (ICC = 25 mA)
VZ
NOTES: 1. Maximum package power dissipation limits must be observed.
2. Adjust VCC above the startup threshold before setting to 12 V.
3. Tlow = 0°C for MC34262
3. Tlow = – 40°C for MC33262
Thigh = + 85°C for MC34262
Thigh = +105°C for MC33262
mA
— 0.25 0.4
— 6.5 12
— 9.0 20
30 36 — V
Pin 4 Threshold
4. K =
VPin 3 (VPin 2 – Vth(M))
5. This parameter is measured with VFB = 0 V, and VPin 3 = 3.0 V.
Figure 1. Current Sense Input Threshold
versus Multiplier Input
1.6
VCC = 12 V
1.4 TA = 25°C
1.2
1.0
0.8
0.6
0.4
0.2
0
– 0.2
VPin 2 = 2.0 V
0.6 1.4 2.2 3.0
VM, MULTIPLIER PIN 3 INPUT VOLTAGE (V)
3.8
MOTOROLA ANALOG IC DEVICE DATA
www.DataSheet.in
Figure 2. Current Sense Input Threshold
versus Multiplier Input, Expanded View
0.08
0.07 VPin 2 = 3.5 V
VPin 2 = 3.25 V
0.06
VCC = 12 V
TA = 25°C
0.05
0.04
0.03
0.02
0.01
0
– 0.12
VPin 2 = 2.0 V
– 0.06 0 0.06 0.12 0.18
VM, MULTIPLIER PIN 3 INPUT VOLTAGE (V)
0.24
3


3Pages


34262P 電子部品, 半導体
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

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部品番号部品説明メーカ
34262P

MC34262

Motorola Semiconductors
Motorola Semiconductors


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