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參數(shù)資料
| 型號： | ML4813 |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Flyback Power Factor Controller(倒轉(zhuǎn)功率因數(shù)控制器) |
| 中文描述： | 反激式功率因數(shù)控制器（倒轉(zhuǎn)功率因數(shù)控制器） |
| 文件頁數(shù)： | 1/15頁 |
| 文件大?。?/td> | 265K |
| 代理商： | ML4813 |
April 1997
ML4813
*
Flyback Power Factor Controller
1
GENERAL DESCRIPTION
The ML4813 is a PWM controller designed for use in a
discontinuous "flyback" or "buck-boost" type power factor
correction (PFC) system for low power, low cost
applications.
The circuit includes a precision reference, oscillator, error
amplifier, over-voltage comparator, over-current
comparator, and an extra op-amp as well as a high
current output. In addition, start-up is simplified by an
under-voltage lockout circuit.
In a typical application, the ML4813 functions as a
voltage mode regulator. By maintaining a constant duty
cycle, the current follows the input voltage, making the
impedance of the entire circuit appear purely resistive.
With the flyback circuit, power factors of 0.99 are easily
achievable with a small output inductor and a minimum
of external components.
FEATURES
I
Precision buffered 5V reference
I
Extra op-amp for output voltage instrumentation
amplifier
I
Overcurrent comparator for switch protection
I
Soft start and under-voltage lockout for easy low surge
off-line starting
I
1A peak current Totem-pole output drive
I
Overvoltage comparator eliminates output "runaway"
due to load removal
I
Large oscillator amplitude for better noise immunity
* This Part Is End Of Life As Of August 1, 2000
BLOCK DIAGRAM
-
+
+
-
S
R
Q
Q
12
OUT
4
VFB
ERROR
AMPLIFIER
5V
2
SOFT START
+
-
1
ILIMIT
CURRENT LIMIT
COMPARATOR
1V
5
OVP
OVP
COMPARATOR
5.6V
-
+
3
COMP
PWM
COMPARATOR
16
CT
9
RT
10
SYNC
OSCILLATOR
15
GND
UNDERVOLTAGE
LOCKOUT
13
VCC
14
VREF
32V
+
-
11
PWR GND
6
OA OUT
7V
7
OA-
8
OA+
60μA
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4819 | Power Factor and PWM Controller “Combo” |
| ML4819CP | Power Factor and PWM Controller “Combo” |
| ML4821 | Power Factor Controller |
| ML4821CP | Power Factor Controller |
| ML4821CS | Power Factor Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4813CP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Flyback Power Factor Controller |
| ML4813CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Flyback Power Factor Controller |
| ML4813IP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Flyback Power Factor Controller |
| ML4813IS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Flyback Power Factor Controller |
| ML4818 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Phase Modulation/Soft Switching Controller |
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