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參數資料
| 型號： | ML4824CS-2 |
| 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： | 0.5 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 250 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, SOIC-16 |
| 文件頁數： | 1/16頁 |
| 文件大?。?/td> | 262K |
| 代理商： | ML4824CS-2 |
June 1998
ML4824
*
Power Factor Correction and PWM Controller Combo
1
GENERAL DESCRIPTION
The ML4824 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 specification. The ML4824 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 device is available in two versions; the ML4824-1
(f
PWM
= f
PFC
) and the ML4824-2 (f
PWM
= 2 x f
PFC
).
Doubling the switching frequency of the PWM allows the
user to design with smaller output components while
maintaining the best 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. The PWM section can be operated in
current or voltage mode at up to 250kHz and includes a
duty cycle limit to prevent transformer saturation.
FEATURES
I
Internally synchronized PFC and PWM in one IC
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
Fast transconductance error amp for voltage loop
I
High efficiency trailing edge PWM can be configured
for current mode or voltage mode operation
I
Average line voltage compensation with brownout
control
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
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
7
+
–
IEA
1
+
–
+
–
PFC OUT
12
S
R
Q
Q
S
R
Q
Q
2.7V
–1V
RAMP 2
8
PWM OUT
11
S
R
Q
Q
VDC
6
SS
5
DC ILIMIT
9
VCC
DUTY CYCLE
LIMIT
–
+
1V
–
+
2.5V
VFB
–
+
8V
8V
VIN OK
GAIN
MODULATOR
VCCZ
x 2
(-2 VERSION ONLY)
3.5k
3.5k
1.25V
50μA
–
+
13.5V
DC ILIMIT
BLOCK DIAGRAM
*Some Packages Are Obsolete
相關PDF資料 |
PDF描述 |
|---|---|
| ML4824IP-1 | Power Factor Correction and PWM Controller Combo |
| ML4824IP-2 | Power Factor Correction and PWM Controller Combo |
| ML4824IP1 | Power Factor Correction and PWM Controller Combo |
| ML4824IP2 | Power Factor Correction and PWM Controller Combo |
| ML4824IS1 | Power Factor Correction and PWM Controller Combo |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ML4824CS2_Q | 功能描述:功率因數校正 IC PFC Controller PWM Combo RoHS:否 制造商:Fairchild Semiconductor 開關頻率: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 |
| ML4824CS2X | 功能描述:功率因數校正 IC PFC Controller PWM Combo RoHS:否 制造商:Fairchild Semiconductor 開關頻率: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 |
| ML4824IP1 | 功能描述:功率因數校正 IC PFC Controller PWM Combo RoHS:否 制造商:Fairchild Semiconductor 開關頻率: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 |
| ML4824IP-1 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Power Factor Correction and PWM Controller Combo |
| ML4824IP1_Q | 功能描述:功率因數校正 IC PFC Controller PWM Combo RoHS:否 制造商:Fairchild Semiconductor 開關頻率: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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