參數(shù)資料
型號(hào)： ML4802
廠商： Fairchild Semiconductor Corporation
英文描述： PFC/PWM Controller Combo with Green Mode(綠色模式PFC/PWM控制器組合芯片)
中文描述： 式PFC / PWM控制器組合（綠色模式功率因數(shù)校正/脈寬調(diào)制控制器組合芯片綠色模式）
文件頁(yè)數(shù)： 1/15頁(yè)
文件大?。?/td> 321K
代理商： ML4802
August 2000
PRELIMINARY
ML4802
PFC/PWM Controller Combo with Green Mode
BLOCK DIAGRAM
GENERAL DESCRIPTION
The ML 4802 is a controller for power factor corrected,
switched mode power supplies that offers Green Mode
operation and reduced start-up and operating currents.
Green Mode is an efficiency improving circuit feature
which operates automatically in low power situations.
This feature helps meet the demands of Energy Star
programs.
Power Factor Correction (PFC) offers the use of lower cost
bulk capacitors, reduces power line loading and stress on
the switching FETs. The ML4802 includes circuits for the
implementation of a leading edge, average current,
“boost” type power factor corrector and a trailing edge
Pulse Width Modulator (PWM).
The PFC frequency of the ML4802 is automatically
synchronized to be one half that of the PWM. This
technique allows the user to design with smaller PWM
components while maintaining the optimum operating
frequency for the PFC. An over-voltage comparator shuts
down the PFC section in the event of a sudden decrease
in load. The PFC section also includes peak current
limiting and brown-out protection.
FEATURES
I
Internally synchronized PFC and PWM in one IC
I
Green Mode maximizes efficiency during low power
standby operation
I
Low supply current
(Start-up 200
μ
A typ., operating 5.5mA typ.)
I
Average current continuous boost leading edge PFC
I
High efficiency trailing edge PWM can be configured
for current mode operation
I
Reduced ripple current in the storage capacitor
between the PFC and PWM sections
I
PFC overvoltage comparator eliminates output
“runaway” due to load removal
I
Current fed gain modulator for improved noise
immunity
I
Overvoltage protection, UVLO, and soft start
VEAO
16
IEAO
OSCILLATOR
OVP
PFC ILIMIT
VREF
PULSE WIDTH MODULATOR
POWER FACTOR CORRECTOR
2.5V
+
-
-
+
7.5V
REFERENCE
VCC
VEA
+
–
IEA
+
-
PFC OUT
2.75V
-1V
PWM OUT
VCC
+
-
1.5V
-
+
2.43V
VFB
-
+
8V
8V
VIN OK
GAIN
MODULATOR
÷2
1.8k
1.8k
VLS
1.25V
25μA
-
+
DC ILIMIT
8V
PFC
OUTPUT
DRIVER
PFC
CONTROLLER
DC LIMIT
PWM
OUTPUT
DRIVER
VFB
VDC
GREEN
MODE
CONTROLLER
GREEN
MODE
1
13
14
12
11
15
VFB
2
IAC
4
VRMS
3
ISENSE
8
RAMP 1
7
RT/CT
9
RAMP 2
6
VDC
5
SS
REV. 1.0 10/10/2000
相關(guān)PDF資料
PDF描述
ML4803 8-Pin PFC and PWM Controller Combo(八腳PFC/PWM控制器組合芯片)
ML4804CP Power Factor Correction and PWM Controller Combo
ML4804CS Power Factor Correction and PWM Controller Combo
ML4804IP Power Factor Correction and PWM Controller Combo
ML4804IS Power Factor Correction and PWM Controller Combo
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ML4802CP 功能描述:功率因數(shù)校正 IC DIP-16 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
ML4802CS 功能描述:功率因數(shù)校正 IC SOIC-16 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
ML4802CSX 功能描述:功率因數(shù)校正 IC SOIC-16 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
ML4802IP 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:PFC/PWM Controller Combo with Green Mode
ML4802IS 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:PFC/PWM Controller Combo with Green Mode
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