參數(shù)資料
型號(hào)： FA5332PM
廠商： FUJI ELECTRIC HOLDINGS CO., LTD.
元件分類： 基準(zhǔn)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(shù)校正
文件頁(yè)數(shù)： 9/13頁(yè)
文件大?。?/td> 151K
代理商： FA5332PM
FA5331P(M)/FA5332P(M)
9
4. No-load operation
The following condition should be meet to prevent from
overvoltage and audible noise during no-load or light-load
operation.
For FA5331
(Fig.10)
0.85
a
≤
R
OFST
(k
)
≤
a
where,
a
=
and, R
n
≤
100
and, R
X
: don’t connect.
You must not connect R
X
which reduces DC gain of current
error amplifier.
You can connect R
5
which is series with capacitor C
3
.
For FA5332
(Fig.11)
R
n
≤
27
and, R
X
: don’t connect.
You must not connect R
X
which reduces DC gain of current
error amplifier.
You can connect R
5
which is series with capacitor C
3
.
If you connect R
OFST
, dead time of AC input current will
extend.
5. How to prevent from intermittent switching of low
frequency
An intermittent switching, which frequency is lower than 10Hz,
occurs in some applications.
In this case, it is possible to prevent from this intermittent
switching to reduce feedback gain by decreasing the
resistance of R4. (See Fig. 2)
You must check the effect thoroughly because this intermittent
switching depends on load, temperature and input condition.
Fig.10
Fig.11
(3.510
3
–0.26R
n
)12
42+0.26R
n
13 REF
IIN–
IFB
C2
C3
R5
Rn
Cn
Current
detection
Rx
IDET
R
OFST
FA5331
2
1
16
Current
detection
13 REF
IIN–
IFB
C2
C3
R5
Rn
Cn
Rx
IDET
R
OFST
FA5332
2
1
16
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