FAN8047G3

9

Application information

2. Regulator & Reset function

• The external circuit is composed of the transistor, KSB772 and a capacitor, about 33uF.

• The capacitor is used as a ripple eliminator.

• The capacitor must have a good temperature characteristics.

• The regulator output voltage is decided as follows.

• When the voltage of the pin 4(RESX) is high, the regulator circuit operates normally. When the voltage of pin 4(RESX) is

low, the regulator circuit is disabled.

INPUT

OUTPUT

SW45

MUTE12

MUTE3

MUTE4

REF1

REF2

BTL

PRE-AMP

REG

CH12

CH3

CH4

CH4

CH5

H

H

H

-

H

-

ON

ON

IN4

ON

ON

ON

H

H

L

-

H

-

ON

OFF

IN4

ON

ON

ON

H

H

H

-

L

-

OFF

OFF

OFF

OFF

ON

ON

H

L

H

-

H

-

OFF

ON

OFF

ON

ON

ON

H

L

L

-

H

-

OFF

OFF

OFF

ON

ON

ON

L

-

-

L

-

-

OFF

OFF

OFF

OFF

ON

ON

L

-

-

H

-

H

OFF

OFF

IN5

OFF

ON

ON

L

-

-

H

-

L

OFF

OFF

OFF

OFF

ON

ON

6

Vref

2.5V

REGVCC

5

4

Vout

33uF

R1

R2

RESX

REGX

REGOX

KSB772

8K

25K

3.3V

25

8

5

.

2

)

2

1

1

(

=

×

=

+

×

=

K

K

R

R

V

V

ref

out