参数资料
| 型号： | NCP1650EVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 15/31页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL NCP1650 PFC CTLR |
| 设计资源： | NCP1650EVB Schematic NCP1650EVB Bill of Materials NCP1650EVB Test Procedure NCP1650EVB Gerber Zip |
| 标准包装： | 1 |
| 主要目的： | 电源管理，功率因数校正 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | NCP1650 |
| 已供物品： | 板 |
| 其它名称： | NCP1650EVB-ND NCP1650EVBOS |
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NCP1650
+Bus
FB/SD
--
V error(dc)
LOOP
COMP
4V
+
VOLTAGE
ERROR
AMP
4V
--
PWM
DRIVER
DRIVE
R ac1
+
PWM
Logic
1
R ac2
AC INPUT
+
--
REFERENCE
MULTIPLIER
V line
.75
V ref
AC ERROR
AMP
+
--
V error(ac)
V error(ac) ?
V error(ac)
V--I
AC
REFERENCE k ? I in
BUFFER
CURRENT
SENSE
AMPLIFIER
I S--
AVERAGE CURRENT
COMPENSATION
REF FILTER
Figure 32. Simplified Block Diagram of Basic PFC Control Circuit
--Bus
The key to understanding how the input current is shaped
into a high quality sine wave is the operation of the AC error
amplifier. The inputs of an operational amplifier operating
in its linear range, must be equal.
There are several secondary effects, that create small
differences between the inverting and non--inverting inputs,
but for the purpose of this analysis they can be considered to
be equal.
The fullwave rectified sinewave output of the reference
multiplier is fed into the non--inverting input of the AC error
amplifier. The inverting input to the AC error amplifier
receives a signal that is comprised of the input fullwave
rectified sinewave (which is not modified by the reference
output so that the signal can be summed with the
instantaneous input switching current (I in ). The output of the
buffer is still V errorac .
AC Input
V ref
V line
multiplier), and summed with the filtered input current.
Since the two inputs to this amplifier will be at the same
potential, the complex signal at the inverting input will have
k ? I in
OSC
the same wave shape as the AC reference signal. The AC
reference signal (V ref ) is a fullwave rectified sinewave, and
the AC input signal (V line ) is also a fullwave rectified
sinewave, therefore, the AC current signal (I in ), must also be
a fullwave rectified sinewave. This relationship gives the
formula:
Vref = .75 · Vline + (k · Iin)
The I in signal has a wide bandwidth, and its instantaneous
value will not follow the low frequency fullwave rectified
sinewave exactly, however, the output of the AC error
amplifier has a low frequency pole that allows the average
V line + k ? I in
V error(ac)
V error(ac) ?
V ref
V error(ac)
4 V ref
GND
4 V ref
GND
value of the .75 V line + (k x I in ) to follow V ref . Since the AC
error amplifier is a transconductance amplifier, it is followed
by an inverting unity gain buffer stage with a low impedance
http://onsemi.com
15
Figure 33. Typical Signals for PFC Circuit
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| NCP1651DR2 | 功能描述:功率因数校正 IC Single Stage PFC 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 |
| NCP1651DR2G | 功能描述:功率因数校正 IC Single Stage PFC 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 |
| NCP1652ADR2G | 功能描述:功率因数校正 IC ANA PFC CONTROLLER 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 |
| NCP1652DR2G | 功能描述:功率因数校正 IC ANA PFC CONTROLLER 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 |
| NCP1652DWR2G | 功能描述:功率因数校正 IC ANA PFC CONTROLLER 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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