BA6780 / BA6780FP-Y

Optical disc ICs

BA6780FP-Y

REVERSIBLE DRIVER

FWD/REV CONTROLLER

Vref

Vconst

17.1k

20k

40k

40k

DRIVE BUFFER

Vref

3.2k

10k

10k

Vref

10k

Vref

Vref

Vref

10k

10k

10k

10k

10k

10k

10k

10k

DRIVE BUFFER

GOVERNOR DRIVER

FWD/REV CONTROLLER

THERMAL

SHUT DOWN

1/2

FIN2

RIN2

C

τ2

FBIN

−

FBIN

+

OUT2

+

OUT2

−

OUT1

−

OUT1

+

Vreg

Vref

Iout

RIN1

FIN1

25

23

24

22

21

20

19

17

16

15

14

18

1

3

2

4

5

6

8

7

10

11

12

13

9

Pin No.

Pin name

I/O

Function

1

N.C.

−

Input pin for setting high output voltage for the reversible driver

I

Input pin for forward control signal for the reversible driver

3

N.C

Input pin for reverse control signal for the reversible driver

4

FIN1

I

Governor load current detector output (open collector

)

5

RIN1

I

Internal reference voltage pin

6

Iout

O

4.6V constant voltage output

−

7

Vref

O

Power supply (

+)

8

Vreg

Reversible driver output (

+)

I

Reversible driver output (

−)

10

N.C.

−

Governor output (

−)

11

OUT1

+

O

Governor output (

+)

O

12

N.C.

−

Governor load current detector amplifier input (

+)

13

OUT1

−

Governor load current detector amplifier input (

−)

14

OUT2

−

O

Power supply (

−) (connection within substrate)

15

N.C.

−

For connection of capacitor for the governor PWM filter

16

OUT2

+

O

Governor reverse control signal input

O

17

FB IN

+

I

Governor forward control signal input

18

FB IN

−

Input pin for setting high output voltage for the governor

I

19

I

20

C

τ 2

21

R IN 2

I

22

F IN 2

I

23

N.C.

−

I

24

25

N.C.

−

∗1