參數(shù)資料
型號(hào)： ML4812IQ
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： Power Factor Controller
中文描述： 1 A POWER FACTOR CONTROLLER, PQCC20
封裝： PLASTIC, LCC-20
文件頁(yè)數(shù)： 7/16頁(yè)
文件大?。?/td> 348K
代理商： ML4812IQ
ML4812
REV. 1.0 10/10/2000
7
ENABLE
VREF
VREF
GEN.
9V
INTERNAL
BIAS
5V VREF
VCC
–
+
I
VCC (V)
0
30
20
40
10
25
20
15
10
5
0
25
20
15
10
5
0
–
60
S
TEMPERATURE (degrees)
20
60
140
100
–
20
–
40
40
80
120
0
OPERATING CURRENT
STARTUP
V
IREF (mA)
0
40
100
20
60
120
80
0
-4
-8
-12
-16
-20
-24
Figure 10. Reference Load Regulation
Figure 8. Under-Voltage Lockout Block Diagram
Figure 9a. Total Supply Current vs. Supply Voltage
Figure 9b. Supply Current (I
CC
) vs. Temperature
TYPICAL APPLICATIONS
INPUT INDUCTOR (L1) SELECTION
The central component in the regulator is the input boost
inductor. The value of this inductor controls various
critical operational aspects of the regulator. If the value is
too low, the input current distortion will be high and will
result in low power factor and increased noise at the
input. This will require more input filtering. In addition,
when the value of the inductor is low the inductor dries
out (runs out of current) at low currents. Thus the power
factor will decrease at lower power levels and/or higher
line voltages. If the inductor value is too high, then for a
given operating current the required size of the inductor
core will be large and/or the required number of turns
will be high. So a balance must be reached between
distortion and core size.
One more condition where the inductor can dry out is
analyzed below where it is shown to be maximum duty
cycle dependent.
For the boost converter at steady state:
(1)
ON
/(T
ON
+ T
OFF
)]. The
condition is satisfied:
(2)
or
(3)
V
INDRY
: voltage where the inductor dries out.
V
OUT
: output DC voltage.
Effectively, the above relationship shows that the resetting
volt-seconds are more than setting volt-seconds. In energy
transfer terms this means that less energy is stored in the
inductor during the ON time than it is asked to deliver
during the OFF time. The net result is that the inductor
dries out.
Where D
ON
is the duty cycle [T
input boost inductor will dry out when the following
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ML4812IQ_Q 功能描述:功率因數(shù)校正 IC PFC Controller RoHS:否 制造商:Fairchild Semiconductor 開(kāi)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
ML4812IQX 功能描述:功率因數(shù)校正 IC PFC Controller RoHS:否 制造商:Fairchild Semiconductor 開(kāi)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
ML4813 制造商:MICRO-LINEAR 制造商全稱(chēng):MICRO-LINEAR 功能描述:Flyback Power Factor Controller
ML4813CP 制造商:MICRO-LINEAR 制造商全稱(chēng):MICRO-LINEAR 功能描述:Flyback Power Factor Controller
ML4813CS 制造商:MICRO-LINEAR 制造商全稱(chēng):MICRO-LINEAR 功能描述:Flyback Power Factor Controller
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