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參數(shù)資料
| 型號(hào)： | ML4800CP |
| 廠商： | Fairchild Semiconductor |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 114K |
| 描述： | IC PFC CTRLR AVERAGE CURR 16DIP |
| 標(biāo)準(zhǔn)包裝： | 25 |
| 模式： | 平均電流 |
| 頻率 - 開關(guān)： | 76kHz |
| 電流 - 啟動(dòng)： | 200µA |
| 電源電壓： | 11 V ~ 16.5 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 16-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 16-DIP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1222 (CN2011-ZH PDF) |
| 其它名稱： | ML4800CP_NL ML4800CP_NL-ND |
PRODUCT SPECIFICATION
ML4800
REV. 1.0.5 9/25/01
9
Error Amplier Compensation
The 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
ampliers. Figure 2 shows the types of compensation
networks most commonly used for the voltage and current
error ampliers, 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 amplier; stability and transient response.
Optimizing interaction between transient response and
stability requires that the error ampliers open-loop cross-
over 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 ML4800s
voltage error amplier has a specially shaped non-linearity
such that under steady-state operating conditions the
transconductance of the error amplier is at a local
minimum. Rapid perturbations in line or load conditions
will cause the input to the voltage error amplier (V
FB
) to
deviate from its 2.5V (nominal) value. If this happens, the
transconductance of the voltage error amplier will increase
signicantly, as shown in the Typical Performance Charac-
teristics. 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 amplier compensation is similar to that of the
voltage error amplier with the exception of the choice of
crossover frequency. The crossover frequency of the current
amplier should be at least 10 times that of the voltage
amplier, 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 amplier, 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 signicantly less marked than that of the
voltage error amplier. This is illustrated in the Typical
Performance Characteristics.
For more information on compensating the current and
voltage control loops, see Application Notes 33 and 34.
Application Note 16 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
V
FB
I
AC
V
RMS
I
SENSE
2.5V
+
16
2
4
3
VEA
+
IEA
+
V
REF
1
PFC
OUTPUT
GAIN
MODULATOR
ML4800
V
CC
GND
V
BIAS
0.22礔
CERAMIC
15V
ZENER
R
BIAS
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4800CP | 制造商:Fairchild Semiconductor Corporation 功能描述:IC PFC/PWM COMBO 4800 DIP16 |
| ML4800CP_NL | 功能描述:功率因數(shù)校正 IC Power Factor PWM Contrl 0.2mA 81KHz 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 |
| ML4800CP_Q | 功能描述:功率因數(shù)校正 IC PFC Controller PWM Combo 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 |
| ML4800CS | 功能描述:功率因數(shù)校正 IC PFC Controller PWM Combo 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 |
| ML4800CS_Q | 功能描述:功率因數(shù)校正 IC PFC Controller PWM Combo 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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