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參數(shù)資料
| 型號(hào)： | ML4821 |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Power Factor Controller |
| 中文描述： | 功率因數(shù)控制器 |
| 文件頁(yè)數(shù)： | 1/12頁(yè) |
| 文件大小： | 106K |
| 代理商： | ML4821 |
www.fairchildsemi.com
REV. 1.0.2 6/19/01
Features
Average current sensing for lowest possible harmonic
distortion
Average line compensation with brown-out control
Precision buffered 5V reference
1A peak current totem-pole output drive
Overvoltage comparator eliminates output “runaway” due
to load removal
Wide common mode range in current sense comparators
for better noise immunity
Large oscillator amplitude for better noise immunity
Output driver internally limited to 17V
“Sleep mode” shutdown input
General Description
The ML4821 provides complete control for a “boost” type
power factor correction system using the average current
sensing method. Special care has been taken in the design of
the ML4821 to increase system noise immunity. The circuit
includes a precision reference, gain modulator, average
current error amplifier, output error amplifier, over-voltage
protection comparator, shutdown logic, as well as a high
current output. In addition, start-up is simplified by an under-
voltage lockout circuit.
In a typical application, the ML4821 controls the AC input
current by adjusting the pulse width of the output MOSFET.
This modulates the line current so that its shape conforms to
the shape of the input voltage. The reference for the current
regulator is a product of the sinusoidal line voltage times the
output of the error amplifier which is regulating the output
DC voltage. Average line voltage compensation is provided
in the gain modulator to ensure constant loop gain over a
wide input voltage range. This compensation includes a
special “brown-out” control which reduces output power
below 90V RMS input.
Block Diagram
11
1
2
3
4
5
8
6
7
9
16
18
15
14
13
12
10
17
+
–
+
–
–
+
–
+
–
+
–
+
V
REF
SOFT START
V
REF
EA
–
EA OUT
V
RMS
I
SINE
OUT
GAIN
MODULATOR
IA
–
IA+
IA OUT
I
LIM
OVP
V
REF
0.7V
R
S
Q
UNDER
VOLTAGE
LOCKOUT
OSC
V
REF
V
LIMIT
17V
GND
V
CC
OUT
PGND
R
T
SYNC
C
T
SLEEP
ML4821
Power Factor Controller
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4821CP | Power Factor Controller |
| ML4821CS | Power Factor Controller |
| ML4822 | ZVS Average Current PFC Controller(零電壓轉(zhuǎn)換和平均電流轉(zhuǎn)換的功率因數(shù)控制器) |
| ML4823 | High Frequency PWM Controller(高頻PWM控制器) |
| ML4823IQ | High Frequency Power Supply Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML482-1 | 制造商:CLARKE INTERNATIONAL 功能描述:CASTOR 102KG 4" SWIVEL/BRAK 制造商:CLARKE INTERNATIONAL 功能描述:CASTOR, 102KG, 4", SWIVEL/BRAKE 制造商:CLARKE INTERNATIONAL 功能描述:CASTOR, 102KG, 4", SWIVEL/BRAKE, For Use With:Industrial and Material Handling Applications, Carrying Capacity:102kg, Wheel Diameter:100mm , RoHS Compliant: NA |
| ML4821CP | 功能描述:功率因數(shù)校正 IC PFC Controller RoHS:否 制造商:Fairchild Semiconductor 開(kāi)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 |
| ML4821CP_Q | 功能描述:功率因數(shù)校正 IC PFC Controller RoHS:否 制造商:Fairchild Semiconductor 開(kāi)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 |
| ML4821CS | 功能描述:功率因數(shù)校正 IC PFC Controller RoHS:否 制造商:Fairchild Semiconductor 開(kāi)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 |
| ML4821CS_Q | 功能描述:功率因數(shù)校正 IC PFC Controller RoHS:否 制造商:Fairchild Semiconductor 開(kāi)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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