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參數(shù)資料
| 型號： | ML4804CP |
| 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, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 1/14頁 |
| 文件大?。?/td> | 145K |
| 代理商： | ML4804CP |
March 2001
PRELIMINARY
ML4804
Power Factor Correction and PWM Controller Combo
GENERAL DESCRIPTION
The ML4804 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 enhancement of the industry-standard ML4824,
the ML4804 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. 1A gate-drive
outputs 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 modulated PFC
and trailing-edge modulated PWM in one IC
I
TriFault Detect
TM
for UL1950 compliance and
enhanced safety
I
V
CC
OVP provides additonal PFC fault protection
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
Reduces ripple current in the storage capacitor
between the PFC and PWM sections
I
Average current, continuous boost leading edge PFC
I
PWM configurable for current-mode or voltage mode
operation
I
Overvoltage and brown-out protection, UVLO, and soft
start
BLOCK DIAGRAM
15
VEAO
IEAO
VFB
IAC
VRMS
ISENSE
RAMP 1
OSCILLATOR
OVP
+
VCCOVP
+
TRI-FAULT
+
PFC ILIMIT
UVLO
VREF
PULSE WIDTH MODULATOR
POWER FACTOR CORRECTOR
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
VCC
-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
–
16.4V
0.5V
–
+
-
-
+
17V
REV. 1.0.2 3/9/2001
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4804CS | Power Factor Correction and PWM Controller Combo |
| ML4804IP | Power Factor Correction and PWM Controller Combo |
| ML4804IS | Power Factor Correction and PWM Controller Combo |
| ML4804 | Power Factor Correction and PWM Controller Combo(功率因數(shù)校正器和PWM控制器組合芯片) |
| ML4805 | Variable Feedforward PFC/PWM Controller Combo |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4804CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Power Factor Correction and PWM Controller Combo |
| ML4804IP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Power Factor Correction and PWM Controller Combo |
| ML4804IS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Power Factor Correction and PWM Controller Combo |
| ML4805 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Variable Feedforward PFC/PWM Controller Combo |
| ML4805CP | 功能描述:功率因數(shù)校正 IC DIP-18 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
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