- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377970 > ML4822 (Fairchild Semiconductor Corporation) 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) PDF資料下載
參數(shù)資料
| 型號(hào)： | ML4822 |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 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) |
| 中文描述： | 零電壓平均電流PFC控制器（零電壓轉(zhuǎn)換和平均電流轉(zhuǎn)換的功率因數(shù)控制器） |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 117K |
| 代理商： | ML4822 |
ML4822
REV. 1.0 10/12/2000
7
Q1 Turn-On
The turn-on event consists of the time it takes for the
current through L2 to ramp to the L1 current plus the
resonant event of L2 and the ZVS capacitor. The total
event should occur in a minimum of 350–450ns, but can
be longer at the risk of increasing the total harmonic
distortion. Setting these times equal should minimize
conducted and radiated emissions.
t
Q1(OFF)
= t
IL2
+ t
RES
= 400ns
(1)
Where I
L2
is equal to I
L1
.
The value of L2 is calculated to remain in discontinuous-
mode:
(2)
The resonant event occurs in 1/4 of a full sinusoidal cycle.
For example, when a 1/4 cycle occurs in 200ns, the
frequency is 1.25MHz.
(3)
Rearranging and solving for L2:
(4)
The resonant capacitor (C
ZVS
) value is found by setting
equations 2 and 4 equal to each other and solving for
C
ZVS
.
(5)
APPLICATION
Figure 3 displays a typical application circuit for a 500W
ZVS PFC supply. Full design details are covered in
application note 33, ML4822 Power Factor Correction
With Zero Voltage Resonant Switching.
Figure 2. Timing Diagrams
t
2
t
3
t
1
A. SYSTEM
CLOCK
(INTERNAL)
B. RTCT
C. ZVS GATE (Q2)
D. VDS (Q2)
E. PFC GATE (Q1)
F. VDS (Q1)
G. I
L2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4823 | High Frequency PWM Controller(高頻PWM控制器) |
| ML4823IQ | High Frequency Power Supply Controller |
| ML4823CP | High Frequency Power Supply Controller |
| ML4823CQ | High Frequency Power Supply Controller |
| ML4823CS | High Frequency Power Supply Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4822CP | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4822CS | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4822CSX | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4822IP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:ZVS Average Current PFC Controller |
| ML4822IS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:ZVS Average Current PFC Controller |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。