參數(shù)資料
型號(hào)： ML4812CQ
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： Power Factor Controller
中文描述： 1 A POWER FACTOR CONTROLLER, PQCC20
封裝： PLASTIC, LCC-20
文件頁(yè)數(shù)： 1/16頁(yè)
文件大?。?/td> 348K
代理商： ML4812CQ
April 1998
ML4812
Power Factor Controller
GENERAL DESCRIPTION
The ML4812 is designed to optimally facilitate a peak
current control boost type power factor correction system.
Special care has been taken in the design of the ML4812
to increase system noise immunity. The circuit includes a
precision reference, gain modulator, error amplifier, over-
voltage protection, ramp compensation, as well as a high
current output. In addition, start-up is simplified by an
under-voltage lockout circuit with 6V hysteresis.
In a typical application, the ML4812 functions as a
current mode regulator. The current which is necessary to
terminate the cycle is a product of the sinusoidal line
voltage times the output of the error amplifier which is
regulating the output DC voltage. Ramp compensation is
programmable with an external resistor, to provide stable
operation when the duty cycle exceeds 50%.
BLOCK DIAGRAM
(Pin Configuration Shown is for DIP Version)
FEATURES
I
Precision buffered 5V reference (
±
0.5%)
I
Current-input gain modulator reduces external
components and improves noise immunity
I
Programmable ramp compensation circuit
I
1A peak current totem-pole output drive
I
Overvoltage comparator helps prevent output
voltage “runaway”
I
Wide common mode range in current sense
comparators for better noise immunity
I
Large oscillator amplitude for better noise immunity
5V
OVP
ISENSE
GM OUT
EA OUT
ISINE
RAMP COMP
CT
RT
ERROR
AMP
IEA
OSC
1k
UNDER
VOLTAGE
LOCKOUT
SHDN
OUT
PWR GND
VREF
VCC
GND
CLOCK
VCC
EA–
32V
5
1
2
10
12
11
14
13
15
9
3
4
6
7
16
8
+
–
5V
+
–
5V
+
–
–
5V
S
R
Q
Q
GAIN MODULATOR
REV. 1.0 10/10/2000
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PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ML4812CQ_Q 功能描述:功率因數(shù)校正 IC PFC Controller RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
ML4812CQX 功能描述:功率因數(shù)校正 IC PFC Controller RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
ML4812IP 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Power Factor Controller
ML4812IQ 功能描述:功率因數(shù)校正 IC PFC Controller RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
ML4812IQ_Q 功能描述:功率因數(shù)校正 IC PFC Controller RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
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