FA5331M datasheet(9/13 Pages) FUJI

9 / 13 page

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•

≤ ROFST(kΩ)≤

where,

and, Rn

≤ 100Ω

and, RX: don’t connect.

•You must not connect RX which reduces DC gain of current

error amplifier.

•You can connect R5 which is series with capacitor C3.

For FA5332 (Fig.11)

≤ 27Ω

and, RX: don’t connect.

•You must not connect RX which reduces DC gain of current

error amplifier.

•You can connect R5 which is series with capacitor C3.

•If you connect ROFST, 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

(3.5•103–0.26•Rn)•12

42+0.26•Rn

13 REF

IIN–

IFB

Current

detection

IDET

ROFST

FA5331

Current

detection

13 REF

IIN–

IFB

IDET

ROFST

FA5332

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