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參數(shù)資料
| 型號： | ML4841CP |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Variable Feedforward PFC/PWM Controller Combo |
| 中文描述： | 0.5 A POWER FACTOR CONTROLLER WITH POST REGULATOR, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 1/15頁 |
| 文件大小： | 129K |
| 代理商： | ML4841CP |
www.fairchildsemi.com
REV. 1.0.3 6/13/01
Features
Internally synchronized PFC and PWM in one IC
Low total harmonic distortion
Reduces ripple current in the storage capacitor between
the PFC and PWM sections
Average current, continuous mode, boost type, leading
edge PFC
High efciency trailing edge PWM can be congured for
current mode or voltage mode operation
Average line voltage compensation with brown-out
control
PFC overvoltage comparator eliminates output
“runaway” due to load removal
Current fed multiplier for improved noise immunity
Overvoltage protection, UVLO, and soft start
General Description
The ML4841 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
IEC1000-2-3 specications. The ML4841 includes circuits
for the implementation of a leading edge, average current,
“boost” type power factor correction, and a trailing edge,
pulse width modulator (PWM).
The PFC frequency of the ML4841 is automatically set at
half that of the PWM frequency generated by the internal
oscillator. This technique allows the user to design with
smaller output components while maintaining the optimum
operating frequency for the PFC. An over-voltage compara-
tor 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 brown-out protection.
Block Diagram
15
VEAO
IEAO
VFB
IAC
VRMS
ISENSE
RAMP 1
OSCILLATOR
OVP
PFC ILIMIT
UVLO
VREF
PULSE WIDTH MODULATOR
POWER FACTOR CORRECTOR
2.5V
+
-
+
16
2
4
3
7.5V
REFERENCE
14
VCC
13
VCCZ
VEA
8
-
+
IEA
1
+
-
+
-
PFC OUT
12
S
R
Q
S
R
Q
2.7V
-1V
RAMP 2
9
PWM OUT
11
S
R
Q
VDC
6
SS
5
RTCT
7
VCC
DUTY CYCLE
LIMIT
+
-
1V
-
+
2.5V
VFB
-
+
8V
VIN OK
GAIN
MODULATOR
VCCZ
÷2
3.5k
3.5k
1.25V
50
A
-
+
13.5V
DC ILIMIT
8V
ML4841
Variable Feedforward PFC/PWM Controller Combo
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4841CP_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 |
| ML4841CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Variable Feedforward PFC/PWM Controller Combo |
| ML4841IP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Variable Feedforward PFC/PWM Controller Combo |
| ML4841IS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Variable Feedforward PFC/PWM Controller Combo |
| ML485 | 制造商:TRIQUINT 制造商全稱:TriQuint Semiconductor 功能描述:1.6-3.2 GHz High IP3 Mixer with Integrated LO Amp |
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