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参数资料
| 型号： | ML4800CS |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 12/14页 |
| 文件大小： | 114K |
| 描述： | IC PFC CTRLR AVERAGE CURR 16SOIC |
| 标准包装： | 48 |
| 模式： | 平均电流 |
| 频率 - 开关： | 76kHz |
| 电流 - 启动： | 200µA |
| 电源电压： | 11 V ~ 16.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 管件 |
ML4800
PRODUCT SPECIFICATION
12
REV. 1.0.5 9/25/01
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 amplier output voltage is then compared with the
modulating ramp. When the modulating ramp reaches the
level of the error amplier output voltage, the switch will be
turned OFF. When the switch is ON, the inductor current will
ramp up. The effective duty cycle of the trailing edge modu-
lation is determined during the ON time of the switch. Figure
4 shows a typical 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 amplier out-
put voltage, the switch will be turned ON. The effective
duty-cycle of the leading edge modulation is determined dur-
ing the OFF time of the switch. Figure 5 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 volt-
age generated by the switching action. With such synchro-
nized 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.
Typical Applications
Figure 6 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.
Figure 5. Typical Leading Edge Control Scheme
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 |
参数描述 |
|---|---|
| ML4800CS_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 |
| ML4800CSX | 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 |
| ML4800CSX_NL | 功能描述:功率因数校正 IC Power Factor PWM Contrl 0.2mA 81KHz 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 |
| ML4800IP | 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 |
| ML4800IS | 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 |
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