FA5331PM Fuji Electric, FA5331PM Datasheet - Page 9

• Manufacturer Part Number: FA5331PM
• Description: Bipolar IC For Power Factor Correction
• Manufacturer: Fuji Electric

FA5331P(M)/FA5332P(M)
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•
where,
and, R
and, R
•You must not connect R
•You can connect R
For FA5332 (Fig.11)
R
and, R
•You must not connect R
•You can connect R
•If you connect R
5. How to prevent from intermittent switching of low
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.
9
error amplifier.
error amplifier.
extend.
n
frequency
27
n
X
X
: don’t connect.
: don’t connect.
=
R
100
OFST
(3.5•10
(k )
OFST
42+0.26•R
3
–0.26•R
5
5
which is series with capacitor C
which is series with capacitor C
, dead time of AC input current will
X
X
n
which reduces DC gain of current
which reduces DC gain of current
)•12
n
3
3
.
.
Current
detection
Current
detection
Rx
Rx
Rn
Rn
R5
R5
R
R
C3
C3
OFST
OFST
Cn
Cn
Fig.10
Fig.11
C2
C2
13 REF
16
13 REF
16
2
1
2
1
IIN–
FA5331
IFB
IDET
IIN–
FA5332
IFB
IDET