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參數(shù)資料
| 型號： | FA5331M |
| 廠商： | FUJI ELECTRIC CO LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Bipolar IC For Power Factor Correction |
| 中文描述： | 1.5 A POWER FACTOR CONTROLLER, 220 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, SOP-16 |
| 文件頁數(shù)： | 5/13頁 |
| 文件大小： | 151K |
| 代理商： | FA5331M |
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(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| FA5530 | Quasi-Resonant IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FA5331P | 制造商:Panasonic Industrial Company 功能描述:IC |
| FA5331P(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. |
| FA5331PM | 制造商:FUJI 制造商全稱:Fuji Electric 功能描述:Bipolar IC For Power Factor Correction |
| 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 |
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