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參數資料
型號: FA5331PM
廠商: FUJI ELECTRIC HOLDINGS CO., LTD.
元件分類: 基準電壓源/電流源
英文描述: Bipolar IC For Power Factor Correction
中文描述: 雙極型IC功率因數校正
文件頁數: 5/13頁
文件大小: 151K
代理商: FA5331PM
5
FA5331P(M)/FA5332P(M)
I
Description of each circuit
1. Oscillator section
This section outputs sawtooth waves oscillating between 0.15
and 3.55V using the capacitor charge and discharge
characteristics. Figure 1 shows how to connect the required
external components to this circuit. The oscillation frequency
is determined by the C
T
and R
T
values. The relationship
between the C
T
and R
T
values is shown in characteristic
curves. Pin 14 (SYNC) is a synchronizing input terminal
whose threshold voltage is about 1V. As Fig. 1 shows, input
rectangular synchronizing signal waves to pin 14 through an
RC circuit. Set the free-running frequency about 10% lower
than the synchronizing signal frequency. Connect a clamp
diode (D1) to prevent an unwanted current inside the IC.
2. Voltage error amplifier and overvoltage limiting circuit
The voltage error amplifier forms a voltage feedback loop to
keep the output voltage stable. The positive input terminal of
this amplifier is connected to the reference voltage (Vr). Fig. 2
shows how to connect the required external components to
this circuit.
The output voltage (Vo) is as follows:
R1
FA5331: Vr=1.54V(typ.)
FA5332: Vr=1.55V(typ.)
Connect a resistor and a capacitor in parallel across error
amplifier output pin 5 and error amplifier negative input pin
6 to set the voltage gain (Av).
The Av value is as follows:
Av =
R4
R3 ( 1 + j
ω
C1 R4 )
...............................(2)
Error amplifier cutoff frequency (fc) is as follows:
fc =
1
2
π
C1 R4
.................................................(3)
If 100 or 120Hz ripples appear at the error amplifier output, the
active filter does not operate stably. To ensure stable
operation, set the fc value to about 1Hz.
An overvoltage detection comparator (C1) is built in to limit the
voltage if the output voltage exceeds the design value. The
reference input voltage (Vp) is as follows:
Vp =
α
Vr .............................................................(4)
α
=1.065
The connections shown in Fig. 2 limit the output voltage to
α
times the design value.
15
R
OSC
CT
RT
CT
D1
Csy
SYNC
13 REF
14
Fig. 1 Oscillator
6
R2
R1
Vo
MUL
5
R3
C1
Vr
R4
_
+
A1
F.F
Vp
4
C1
ER.AMP
OVP
Fig. 2 Voltage error amplifier and overvoltage limiting circuit
Vo = R1 + R2
Vr
相關PDF資料
PDF描述
FA5331M Bipolar IC For Power Factor Correction
FA5332M Bipolar IC For Power Factor Correction
FA5332P Bipolar IC For Power Factor Correction
FA5332PM Bipolar IC For Power Factor Correction
FA5502 POWER SUPPLY CONTROL IC
相關代理商/技術參數
參數描述
FA5332M 制造商:FUJI 制造商全稱:Fuji Electric 功能描述:Bipolar IC For Power Factor Correction
FA5332P 制造商:FUJI 制造商全稱:Fuji Electric 功能描述:Bipolar IC For Power Factor Correction
FA5332P(M) 制造商:未知廠家 制造商全稱:未知廠家 功能描述:FA5331P(M) and FA5332P(M) are control ICs for a power factor correction system.
FA5332PM 制造商:FUJI 制造商全稱:Fuji Electric 功能描述:Bipolar IC For Power Factor Correction
FA5364X 功能描述:LED ORANGE CLEAR 5MM HI BRIGHT RoHS:是 類別:光電元件 >> LED - Millicandela 等級:2260mcd 正向電壓:2.1V 電流 - 測試:20mA 波長 - 主:590nm 波長 - 峰值:- 視角:- 透鏡類型:散射,有色 透鏡樣式/尺寸:圓頂橢圓,5.1mm x 3.7mm 封裝/外殼:徑向 尺寸/尺寸:- 高度:7.00mm 安裝類型:通孔 包裝:散裝 在特定電流下的光通量 - 測試:-
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