- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄378881 > CM6824 (Electronic Theatre Controls, Inc.) LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO PDF資料下載
參數(shù)資料
| 型號： | CM6824 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO |
| 中文描述： | 低啟動電流式PFC / PWM控制器組合 |
| 文件頁數(shù)： | 14/18頁 |
| 文件大?。?/td> | 342K |
| 代理商： | CM6824 |
CM6824
L
OW
S
TART-
U
P
C
URRENT
PFC/PWM C
ONTROLLER
C
OMBO
Leading/Trailing Modulation
Conventional Pulse Width Modulation (PWM) techniques
employ trailing edge modulation in which the switch will turn
on right after the trailing edge of the system clock. The error
amplifier output is then compared with the modulating ramp
up. The effective duty cycle of the trailing edge modulation
is determined during the ON time of the switch. Figure 4
shows a typical trailing edge control scheme.
In case of leading edge modulation, the switch is turned
OFF right at the leading edge of the system clock. When
the modulating ramp reaches the level of the error amplifier
output voltage, the switch will be turned ON. The effective
duty-cycle of the leading edge modulation is determined
during OFF time of the switch. Figure 5 shows a leading
edge control scheme.
2002/09/20
Preliminary
Rev. 1.1
Champion Microelectronic Corporation
Page 14
One of the advantages of this control technique is that it
required only one system clock. Switch 1(SW1) turns off and
switch 2 (SW2) turns on at the same instant to minimize the
momentary “no-load” period, thus lowering ripple voltage
generated by the switching action. With such synchronized
switching, the ripple voltage of the first stage is reduced.
Calculation and evaluation have shown that the 120Hz
component of the PFC’s output ripple voltage can be
reduced by as much as 30% using this method.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CM6824IP | LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO |
| CM6824IS | LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO |
| CM8501GIS | 1.5A BUS TERMINATOR |
| CM8501IS | 1.5A BUS TERMINATOR |
| CM8501IT | 1.5A BUS TERMINATOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CM6824-000 | 制造商:TE Connectivity 功能描述:D-436-37-SNPB - Bulk |
| CM6824IP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO |
| CM6824IS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO |
| CM6825-000 | 制造商:TE Connectivity 功能描述:D-436-38-SNPB - Bulk |
| CM683 | 制造商:CML 制造商全稱:Chicago Miniature Lamp,inc 功能描述:T-1 Wire Terminal (standard) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。