Datasheet.kr   

MC34262 데이터시트 PDF




Motorola Semiconductors에서 제조한 전자 부품 MC34262은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

PDF 형식의 MC34262 자료 제공

부품번호 MC34262 기능
기능 (MC33262 / MC34262) POWER FACTOR CONTROLLERS
제조업체 Motorola Semiconductors
로고 Motorola Semiconductors 로고


MC34262 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




전체 16 페이지수

미리보기를 사용할 수 없습니다

MC34262 데이터시트, 핀배열, 회로
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




MC34262 pdf, 반도체, 판매, 대치품
MC34262 MC33262
Figure 3. Voltage Feedback Input Threshold
Change versus Temperature
4.0
VCC = 12 V
Pins 1 to 2
0
– 4.0
– 8.0
–12
Figure 4. Overvoltage Comparator Input
Threshold versus Temperature
110
VCC = 12 V
109
108
107
–16
– 55
– 25 0 25 50 75
TA, AMBIENT TEMPERATURE (°C)
100
125
106
– 55 – 25 0 25 50 75 100
TA, AMBIENT TEMPERATURE (°C)
125
Figure 5. Error Amp Transconductance and
Phase versus Frequency
120
Phase
100 Transconductance
80
VCC = 12 V
VO = 2.5 V to 3.5 V
RL = 100 k to 3.0 V
CL = 2.0 pF
TA = 25°C
0
30
60
60 90
40 120
20 150
0 180
3.0 k 10 k 30 k 100 k 300 k 1.0 M 3.0 M
f, FREQUENCY (Hz)
Figure 6. Error Amp Transient Response
4.00 V
3.25 V
VCC = 12 V
RL = 100 k
CL = 2.0 pF
TA = 25°C
2.50 V
5.0 µs/DIV
Figure 7. Quickstart Charge Current
versus Temperature
1.80
VCC = 12 V
1.76
900
800
1.72
Voltage
1.68
Current
700
600
1.64
– 55 – 25
0 25 50 75
TA, AMBIENT TEMPERATURE (°C)
100
500
125
Figure 8. Restart Timer Delay
versus Temperature
800
VCC = 12 V
700
600
500
400
– 55
– 25 0 25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
4 MOTOROLA ANALOG IC DEVICE DATA

4페이지










MC34262 전자부품, 판매, 대치품
MC34262 MC33262
Error Amplifier
An Error Amplifier with access to the inverting input and
output is provided. The amplifier is a transconductance type,
meaning that it has high output impedance with controlled
voltage–to–current gain. The amplifier features a typical gm
of 100 µmhos (Figure 5). The noninverting input is internally
biased at 2.5 V ± 2.0% and is not pinned out. The output
voltage of the power factor converter is typically divided down
and monitored by the inverting input. The maximum input
bias current is – 0.5 µA, which can cause an output voltage
error that is equal to the product of the input bias current and
the value of the upper divider resistor R2. The Error Amp
output is internally connected to the Multiplier and is pinned
out (Pin 2) for external loop compensation. Typically, the
bandwidth is set below 20 Hz, so that the amplifier’s output
voltage is relatively constant over a given ac line cycle. In
effect, the error amp monitors the average output voltage of
the converter over several line cycles. The Error Amp output
stage was designed to have a relatively constant
transconductance over temperature. This allows the
designer to define the compensated bandwidth over the
intended operating temperature range. The output stage can
sink and source 10 µA of current and is capable of swinging
from 1.7 V to 6.4 V, assuring that the Multiplier can be driven
over its entire dynamic range.
A key feature to using a transconductance type amplifier,
is that the input is allowed to move independently with
respect to the output, since the compensation capacitor is
connected to ground. This allows dual usage of of the Voltage
Feedback Input pin by the Error Amplifier and by the
Overvoltage Comparator.
Overvoltage Comparator
An Overvoltage Comparator is incorporated to eliminate
the possibility of runaway output voltage. This condition can
occur during initial startup, sudden load removal, or during
output arcing and is the result of the low bandwidth that must
be used in the Error Amplifier control loop. The Overvoltage
Comparator monitors the peak output voltage of the
converter, and when exceeded, immediately terminates
MOSFET switching. The comparator threshold is internally
set to 1.08 Vref. In order to prevent false tripping during
normal operation, the value of the output filter capacitor C3
must be large enough to keep the peak–to–peak ripple less
than 16% of the average dc output. The Overvoltage
Comparator input to Drive Output turn–off propagation delay
is typically 400 ns. A comparison of startup overshoot without
and with the Overvoltage Comparator circuit is shown in
Figure 23.
Multiplier
A single quadrant, two input multiplier is the critical
element that enables this device to control power factor. The
ac full wave rectified haversines are monitored at Pin 3
with respect to ground while the Error Amp output at Pin 2 is
monitored with respect to the Voltage Feedback Input
threshold. The Multiplier is designed to have an extremely
linear transfer curve over a wide dynamic range, 0 V to 3.2 V
for Pin 3, and 2.0 V to 3.75 V for Pin 2, Figure 1. The Multiplier
output controls the Current Sense Comparator threshold as
the ac voltage traverses sinusoidally from zero to peak line,
Figure 18. This has the effect of forcing the MOSFET on–time
to track the input line voltage, resulting in a fixed Drive Output
on–time, thus making the preconverter load appear to be
resistive to the ac line. An approximation of the Current
Sense Comparator threshold can be calculated from the
following equation. This equation is accurate only under the
given test condition stated in the electrical table.
VCS, Pin 4 Threshold 0.65 (VPin 2 – Vth(M)) VPin 3
A significant reduction in line current distortion can be
attained by forcing the preconverter to switch as the ac line
voltage crosses through zero. The forced switching is
achieved by adding a controlled amount of offset to the
Multiplier and Current Sense Comparator circuits. The
equation shown below accounts for the built–in offsets and is
accurate to within ten percent. Let Vth(M) = 1.991 V
VCS, Pin 4 Threshold = 0.544 (VPin 2 – Vth(M)) VPin 3
+ 0.0417 (VPin 2 – Vth(M))
Zero Current Detector
The MC34262 operates as a critical conduction current
mode controller, whereby output switch conduction is initiated
by the Zero Current Detector and terminated when the peak
inductor current reaches the threshold level established by
the Multiplier output. The Zero Current Detector initiates the
next on–time by setting the RS Latch at the instant the
inductor current reaches zero. This critical conduction mode
of operation has two significant benefits. First, since the
MOSFET cannot turn–on until the inductor current reaches
zero, the output rectifier reverse recovery time becomes less
critical, allowing the use of an inexpensive rectifier. Second,
since there are no deadtime gaps between cycles, the ac line
current is continuous, thus limiting the peak switch to twice
the average input current.
The Zero Current Detector indirectly senses the inductor
current by monitoring when the auxiliary winding voltage falls
below 1.4 V. To prevent false tripping, 200 mV of hysteresis is
provided. Figure 9 shows that the thresholds are
well–defined over temperature. The Zero Current Detector
input is internally protected by two clamps. The upper 6.7 V
clamp prevents input overvoltage breakdown while the lower
0.7 V clamp prevents substrate injection. Current limit
protection of the lower clamp transistor is provided in the
event that the input pin is accidentally shorted to ground. The
Zero Current Detector input to Drive Output turn–on
propagation delay is typically 320 ns.
MOTOROLA ANALOG IC DEVICE DATA
7

7페이지


구       성 총 16 페이지수
다운로드[ MC34262.PDF 데이터시트 ]

당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는

포괄적인 데이터시트를 제공합니다.


구매 문의
일반 IC 문의 : 샘플 및 소량 구매
-----------------------------------------------------------------------

IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한
광범위한 전력 반도체를 판매합니다.

전력 반도체 전문업체

상호 : 아이지 인터내셔날

사이트 방문 :     [ 홈페이지 ]     [ 블로그 1 ]     [ 블로그 2 ]



관련 데이터시트

부품번호상세설명 및 기능제조사
MC34261

(MC33261 / MC34261) POWER FACTOR CONTROLLERS

Motorola Semiconductors
Motorola Semiconductors
MC34261

(MC33261 / MC34261) Power Factor Controllers

ON Semiconductor
ON Semiconductor

DataSheet.kr       |      2020   |     연락처      |     링크모음      |      검색     |      사이트맵