PBL 3770A

4

Figure 3. Pin configurations.

Pin Description

SO

DIP

PLCC

Symbol

Description

11

10

M

B

Motor output B, Motor current flows from M

2

2

11

T

Clock oscillator. Timing pin connect a 56 k

Ω resistor and a 820 pF in

parallel between T and Ground.

3

3,14

12,4

V

MM

Motor supply voltage, 10 to 40 V. Pin 3(12) and pin 14(4) should be wired together.

4-7,

4,5,

1-3,9,

GND

Ground and negative supply. Note these pins are used for heatsinking.

14-18

12,13

13-17,28

Make sure that all ground pins are soldered onto a suitable large copper

ground plane for efficient heat sinking.

86

18

V

CC

Logic voltage supply normally +5 V.

97

19

I

1

Logic input. It controls, together with the I0 input, the current level in the output stage.

The controlable levels are fixed to 100, 60, 20, 0%.

10

8

20

Phase

Controls the direction of the motor current of M

Motor current flows from M

11

9

21

I

0

Logic input. It controls, together with the I1 input, the current level in the output stage.

The controlable levels are fixed to 100, 60, 20, 0%.

12

10

23

C

Comparator input. This input senses the instaneous voltage across the sensing

resistor, filtered through a RC Network.

13

11

24

V

R

Reference voltage. Controls the threshold voltage of the comparator and hence

the output current. Input resistance: typically 6.8 k

Ω ± 20%.

19

15

6

M

A

Motor output A, Motor current flows from M

20

16

8

E

Common emitter. Connect the Sence resistor between this pin and ground.

1

2

3

4

5

6

7

8

9

10

18

17

16

15

14

13

12

11

I1

VR

M

B

VCC

T

VMM

GDN

E

Phase

0

C

19

20

GDN

GDN

GDN

GDN

GDN

GDN

GDN

VMM

M

A

PBL

3770A

I

B

T

MM

GND

GND

CC

1

Phase

E

M

GND

GND

V

C

I

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

A

R

0

I

V

V

M

PBL

3770A

N/C

A

N/C

E

GND

B

T

N/C

V

C

N/C

I

Phase

I

5

6

7

8

9

10

11

25

24

23

22

21

20

19

R

0

1

M

M

PBL

3770A