參數(shù)資料
型號(hào)： ML4800IS
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： Power Factor Correction and PWM Controller Combo
中文描述： 1 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 250 kHz SWITCHING FREQ-MAX, PDSO16
封裝： PLASTIC, SOIC-16
文件頁(yè)數(shù)： 1/14頁(yè)
文件大?。?/td> 154K
代理商： ML4800IS
March 2001
PRELIMINARY
ML4800
Power Factor Correction and PWM Controller Combo
GENERAL DESCRIPTION
The ML4800 is a controller for power factor corrected,
switched mode power supplies. Power Factor Correction
(PFC) allows the use of smaller, lower cost bulk capacitors,
reduces power line loading and stress on the switching
FETs, and results in a power supply that fully complies
with IEC1000-3-2 specification. Intended as a BiCMOS
version of the industry-standard ML4824, the ML4800
includes circuits for the implementation of leading edge,
average current, “boost” type power factor correction and
a trailing edge, pulse width modulator (PWM). It also
includes a TriFault Detect function to help ensure that no
unsafe conditions will result from single component failure
in the PFC. Gate-drivers with 1A capabilities minimize the
need for external driver circuits. Low power requirements
improve efficiency and reduce component costs.
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 input voltage
brownout protection. The PWM section can be operated in
current or voltage mode, at up to 250kHz, and includes an
accurate 50% duty cycle limit to prevent transformer
saturation.
FEATURES
I
Internally synchronized leading-edge PFC and trailing-
edge PWM in one IC
I
TriFault Detect for UL1950 compliance and
enhanced safety
I
Slew rate enhanced transconductance error amplifier
for ultra-fast PFC response
I
Low power: 200
μ
A startup current, 5.5mA operating
current
I
Low total harmonic distortion, high PF
I
Reduced ripple current in storage capacitor between
PFC and PWM sections
I
Average current, continuous boost leading edge PFC
I
PWM configurable for current-mode or voltage mode
operation
I
Current fed gain modulator for improved noise immunity
I
Overvoltage and brown-out protection, UVLO, and soft
start
BLOCK DIAGRAM
15
VEAO
IEAO
VFB
IAC
VRMS
ISENSE
RAMP 1
OSCILLATOR
OVP
+
PFC ILIMIT
UVLO
VREF
PULSE WIDTH MODULATOR
POWER FACTOR CORRECTOR
TRI-FAULT
2.5V
-
-
+
16
2
4
3
7.5V
REFERENCE
14
VCC
13
VCC
VEA
7
-
+
IEA
1
+
-
+
-
+
-
PFC OUT
12
S
R
Q
Q
S
R
Q
Q
2.75V
0.5V
-1V
RAMP 2
8
PWM OUT
11
S
R
Q
Q
VDC
6
SS
5
DC ILIMIT
9
VCC
DUTY CYCLE
LIMIT
-
+
1.0V
-
+
2.45V
VFB
-
+
VREF
VIN OK
GAIN
MODULATOR
VCC
1.6k
1.6k
1.25V
25μA
-
+
DC ILIMIT
17V
REV. 1.0.2 3/7/2001
相關(guān)PDF資料
PDF描述
ML4800CP Power Factor Correction and PWM Controller Combo
ML4800CS Power Factor Correction and PWM Controller Combo
ML4800 Power Factor Correction and PWM Controller Combo(功率因數(shù)校正器和PWM控制器組合芯片)
ML4801CP Variable Feedforward PFC/PWM Controller Combo
ML4801CS Variable Feedforward PFC/PWM Controller Combo
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ML4800IS_Q 功能描述:功率因數(shù)校正 IC PFC Controller PWM Combo RoHS:否 制造商:Fairchild Semiconductor 開關(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
ML4800ISX 功能描述:功率因數(shù)校正 IC PFC Controller PWM Combo RoHS:否 制造商:Fairchild Semiconductor 開關(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
ML4801 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Variable Feedforward PFC/PWM Controller Combo
ML4801 WAF UP 制造商:Fairchild Semiconductor Corporation 功能描述:
ML4801CP 功能描述:功率因數(shù)校正 IC DIP-16 RoHS:否 制造商:Fairchild Semiconductor 開關(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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