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參數(shù)資料
| 型號(hào)： | ML4802CS |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | PFC/PWM Controller Combo with Green Mode |
| 中文描述： | 0.5 A POWER FACTOR CONTROLLER WITH POST REGULATOR, PDSO16 |
| 封裝： | PLASTIC, SOIC-16 |
| 文件頁(yè)數(shù)： | 12/15頁(yè) |
| 文件大小： | 285K |
| 代理商： | ML4802CS |
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ML4802
12
REV. 1.0.1 12/12/2000
Figure 6. Leading/Trailing Edge Control Scheme
In the 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 the OFF time of the switch. Figure 6
shows a leading edge control scheme.
One of the advantages of this control technique is that it
requires 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.
FUNCTIONAL DESCRIPTION
(Continued)
REF
EA
–
+
–
+
OSC
DFF
R
D
Q
Q
CLK
U1
RAMP
CLK
U4
U3
C1
RL
I4
SW2
SW1
+
DC
I1
I2
I3
VIN
L1
VEAO
CMP
U2
RAMP
VEAO
TIME
VSW1
TIME
TYPICAL APPLICATIONS
Figure 7 is the application circuit for a complete 100W
power factor corrected power supply, designed using the
methods and general topology detailed in Application
Note 33.
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PDF描述 |
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| ML4802IP | PFC/PWM Controller Combo with Green Mode |
| ML4802IS | PFC/PWM Controller Combo with Green Mode |
| ML4802 | PFC/PWM Controller Combo with Green Mode(綠色模式PFC/PWM控制器組合芯片) |
| ML4803 | 8-Pin PFC and PWM Controller Combo(八腳PFC/PWM控制器組合芯片) |
| ML4804CP | Power Factor Correction and PWM Controller Combo |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4802CSX | 功能描述:功率因數(shù)校正 IC SOIC-16 RoHS:否 制造商:Fairchild Semiconductor 開關(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 |
| ML4802IP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:PFC/PWM Controller Combo with Green Mode |
| ML4802IS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:PFC/PWM Controller Combo with Green Mode |
| ML4803 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:8-Pin PFC and PWM Controller Combo |
| ML4803CP1 | 功能描述:功率因數(shù)校正 IC PFC Controller PWM Combo RoHS:否 制造商:Fairchild Semiconductor 開關(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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