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| 型号： | FAN4802SMY |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.5 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 268 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 0.150 INCH, GREEN, MS-012AC, SOIC-16 |
| 文件页数： | 8/19页 |
| 文件大小： | 577K |
| 代理商： | FAN4802SMY |
2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN4800AS/CS/01S/02S Rev. 1.0.1
16
FA
N
4800A
S/C
S
/01S/02S
—
PFC/PWM
Controller
Combination
PWM Control (RAMP)
When the PWM section is used in current mode, RAMP
is generally used as the sampling point for a voltage,
representing the current in the primary of the PWM’s
output transformer. The voltage is derived either from a
current-sensing resistor or a current transformer. In
voltage mode, RAMP is the input for a ramp voltage
generated by a second set of timing components
(RRAMP, CRAMP) that have a minimum value of 0V and a
peak value of approximately 6V. In voltage mode,
feedforward from the PFC output bus is an excellent
way to derive the timing ramp for the PWM stage.
Generating VDD
After turning on the FAN4800AS/CS/01S/02S at 11V,
the operating voltage can vary from 9.3V to 28V. The
threshold voltage of the VDD OVP comparator is 28V
and its hysteresis is 1V. When VDD reaches 28V, OPFC
is LOW and the PWM section is not disturbed. There
are two ways to generate VDD: use auxiliary power
supply around 15V or use bootstrap winding to self-bias
the FAN4800AS/CS/01S/02S system. The bootstrap
winding can be taped from the PFC boost choke or the
transformer of the DC-to-DC stage.
Leading/Trailing Edge Modulation
Conventional PWM techniques employ trailing-edge
modulation, in which the switch turns 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.
In the case of leading-edge modulation, the switch is
turned off exactly at the leading edge of the system
clock. When the modulating ramp reaches the level of
the error amplifier output voltage, the switch is turned
on. The effective duty-cycle of the leading-edge
modulation is determined during off-time of the switch.
相关PDF资料 |
PDF描述 |
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| FAN4801SMY | 0.5 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 268 kHz SWITCHING FREQ-MAX, PDSO16 |
| FAN4801SNY | 0.5 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 268 kHz SWITCHING FREQ-MAX, DIP16 |
| FAN4800CSMY | 0.5 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 268 kHz SWITCHING FREQ-MAX, PDSO16 |
| FAN4800CSNY | 0.5 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 268 kHz SWITCHING FREQ-MAX, DIP16 |
| FAN4802SNY | 0.5 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 268 kHz SWITCHING FREQ-MAX, DIP16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN4802SNY | 功能描述:电流型 PWM 控制器 PFC/PWM Controller Combination RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| FAN4803 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:8-Pin PFC and PWM Controller Combo |
| FAN4803CP1 | 功能描述:功率因数校正 IC PFC/PWM Controller 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 |
| FAN4803CP-1 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:8-Pin PFC and PWM Controller Combo |
| FAN4803CP1_Q | 功能描述:功率因数校正 IC PFC/PWM Controller 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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