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參數(shù)資料
| 型號： | FAN4810MX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Power Factor Correction Controller |
| 中文描述： | 1 A POWER FACTOR CONTROLLER, PDSO16 |
| 封裝： | 0.150 INCH, SOIC-16 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 160K |
| 代理商： | FAN4810MX |
PRODUCT SPECIFICATION
FAN4810
REV. 1.0.12 9/24/03
9
Error Amplifier Compensation
The output of the PFC is typically loaded by a PWM
converter to produce the low voltages and high currents
required at the outputs of a SMPS. PWM loading of the
PFC can be modeled as a negative resistor; an increase in
input voltage to the PWM causes a decrease in the input
current. This response dictates the proper compensation of
the two transconductance error amplifiers. Figure 2 shows
the types of compensation networks most commonly used
for the voltage and current error amplifiers, along with their
respective return points. The current loop compensation is
returned to V
REF
to produce a soft-start characteristic on the
PFC: as the reference voltage comes up from zero volts, it
creates a differentiated voltage on IEAO which prevents the
PFC from immediately demanding a full duty cycle on its
boost converter. There are two major concerns when
compensating the voltage loop error amplifier; stability and
transient response. Optimizing interaction between transient
response and stability requires that the error amplifier’s
open-loop crossover frequency should be 1/2 that of the line
frequency, or 23Hz for a 47Hz line (lowest anticipated
international power frequency). The gain vs. input voltage
of the FAN4810’s voltage error amplifier has a specially
shaped non-linearity such that under steady-state operating
conditions the transconductance of the error amplifier is at a
local minimum. Rapid perturbations in line or load condi-
tions will cause the input to the voltage error amplifier (V
FB
)
to deviate from its 2.5V (nominal) value. If this happens,
thetransconductance of the voltage error amplifier will
increase significantly, as shown in the Typical Performance
Characteristics. This raises the gain-bandwidth product of
the voltage loop, resulting in a much more rapid voltage loop
response to such perturbations than would occur with a
conventional linear gain characteristic.
The current amplifier compensation is similar to that of the
voltage error amplifier with the exception of the choice of
crossover frequency. The crossover frequency of the current
amplifier should be at least 10 times that of the voltage
amplifier,to prevent interaction with the voltage loop.
It should also be limited to less than 1/6th that of the
switching frequency, e.g. 16.7kHz for a 100kHz switching
frequency.
There is a modest degree of gain contouring applied to the
transfer characteristic of the current error amplifier, to
increase its speed of response to current-loop perturbations.
However, the boost inductor will usually be the dominant
factor in overall current loop response. Therefore, this
contouring is significantly less marked than that of the
voltage error amplifier. This is illustrated in the Typical
Performance Characteristics.
For more information on compensating the current and
voltage control loops, see Application Note AN42045.
Application Note 42030 also contains valuable information
for the design of this class of PFC.
Figure 2. Compensation Network Connections for the
Voltage and Current Error Amplifiers
Figure 3. External Component Connections to V
CC
15
VEAO
IEAO
VFB
IAC
VRMS
ISENSE
2.5V
–
+
16
2
4
3
VEA
+
–
IEA
+
–
VREF
1
PFC
OUTPUT
GAIN
MODULATOR
FAN4810
VCC
GND
VBIAS
0.22
μ
F
CERAMIC
15V
ZENER
RBIAS
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| FAN4810N | 功能描述:功率因數(shù)校正 IC PFC Preregulator 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 |
| FAN4810N_Q | 功能描述:功率因數(shù)校正 IC PFC Preregulator 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 |
| FAN4822 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:ZVS Average Current PFC Controller |
| FAN4822IM | 功能描述:功率因數(shù)校正 IC PFC Controller 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 |
| FAN4822IM_Q | 功能描述:功率因數(shù)校正 IC PFC Controller 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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