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•

where,

=

≤ 100Ω

error amplifier.

For FA5332 (Fig.11)

≤ 27Ω

error amplifier.

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

13 REF

IIN–

IFB

C2

C3

R5

Rn

Cn

Current

detection

Rx

IDET

FA5331

2

1

16

Current

detection

13 REF

IIN–

IFB

C2

C3

R5

Rn

Cn

Rx

IDET

FA5332

2

1

16