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PRODUCT SPECIFICATION
ML4824
REV. 1.0.6 11/7/03
11
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 amplier
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 5 shows a leading
edge control scheme.
One of the advantages of this control teccnique 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 rst stage
is reduced. Calculation and evaluation have shown that the
120Hz component of the PFCs output ripple voltage can be
reduced by as much as 30% using this method.
 Figure 4. Typical Trailing Edge Control Scheme.
 Figure 5. Typical Leading Edge Control Scheme.
RAMP
VEAO
TIME
VSW1
TIME
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
U2
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
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相关代理商/技术参数
ML4824CS-2 制造商:MICRO-LINEAR 制造商全称:MICRO-LINEAR 功能描述:Power Factor Correction and PWM Controller Combo
ML4824CS2_Q 功能描述:功率因数校正 IC PFC Controller PWM Combo RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel
ML4824CS2X 功能描述:功率因数校正 IC PFC Controller PWM Combo RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel
ML4824IP1 功能描述:功率因数校正 IC PFC Controller PWM Combo RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel
ML4824IP-1 制造商:MICRO-LINEAR 制造商全称:MICRO-LINEAR 功能描述:Power Factor Correction and PWM Controller Combo
ML4824IP1_Q 功能描述:功率因数校正 IC PFC Controller PWM Combo RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel
ML4824IP2 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Power Factor Correction and PWM Controller Combo
ML4824IP-2 制造商:MICRO-LINEAR 制造商全称:MICRO-LINEAR 功能描述:Power Factor Correction and PWM Controller Combo