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參數(shù)資料
| 型號(hào)： | ML4801 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Variable Feedforward PFC/PWM Controller Combo(前饋可變PFC/PWM控制器組合芯片) |
| 中文描述： | 可變前饋式PFC / PWM控制器組合（前饋可變式PFC /脈寬調(diào)制控制器組合芯片） |
| 文件頁數(shù)： | 1/14頁 |
| 文件大?。?/td> | 278K |
| 代理商： | ML4801 |
November 1998
PRELIMINARY
ML4801
Variable Feedforward PFC/PWM Controller Combo
GENERAL DESCRIPTION
The ML4801 is a controller for power factor corrected,
switched mode power supplies. Key features of this
combined PFC and PWM controller are low start-up and
operating currents. 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 specifications. The ML4801 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 ML4801 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 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 brown-
out protection.
FEATURES
I
Internally synchronized PFC and PWM in one IC
I
Low start-up current (200
μ
A typ.)
I
Low operating current (5.5mA typ.)
I
Low total harmonic distortion
I
Reduces ripple current in the storage capacitor
between the PFC and PWM sections
I
Average current continuous boost leading edge PFC
I
High efficiency trailing edge PWM optimized for
current mode operation
I
Current fed gain modulator for improved noise
immunity
I
Brown-out control, overvoltage 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
2.5V
-
-
+
16
2
4
3
7.5V
REFERENCE
14
VCC
13
VCC
VEA
8
+
–
IEA
1
+
-
+
-
PFC OUT
12
S
R
Q
Q
S
R
Q
Q
2.75V
-1V
RAMP 2
9
PWM OUT
11
GND
10
S
R
Q
Q
VDC
6
SS
5
RTCT
7
VCC
DUTY CYCLE
LIMIT
+
-
1.5V
-
+
2.5V
VFB
-
+
8V
8V
VIN OK
GAIN
MODULATOR
VCC
÷2
1.6k
1.6k
1.25V
25μA
-
+
DC ILIMIT
REV. 1.0 10/10/2000
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4802CP | PFC/PWM Controller Combo with Green Mode |
| ML4802CS | PFC/PWM Controller Combo with Green Mode |
| ML4802IP | PFC/PWM Controller Combo with Green Mode |
| ML4802IS | PFC/PWM Controller Combo with Green Mode |
| ML4802 | PFC/PWM Controller Combo with Green Mode(綠色模式PFC/PWM控制器組合芯片) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| ML4801CS | 功能描述:功率因數(shù)校正 IC SOIC-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 |
| ML4801CSX | 功能描述:功率因數(shù)校正 IC SOIC-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 |
| ML4801IP | 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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