NJM3775

s PIN DESCRIPTION

EMP

DIP

PLCC

Symbol

Description

2

1

[8]

M

B1

Motor output B, channel 1. Motor current flows from M

32[10]

E

1

Common emitter, channel 1. This pin connects to a sensing resistor R

S

to ground.

43[11]

M

A1

Motor output A, channel 1. Motor current flows from M

54[12]

V

MM1

Motor supply voltage, channel 1, +10 to +40 V. V

6,7

5, 6,

[1-3, 9, GND

Ground and negative supply. Note: these pins are used thermally for heat-sinking.

18,19 17, 18 13-17,

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

28]

for efficient heat sinking.

87[18]

V

R1

Reference voltage, channel 1. Controls the comparator threshold voltage and hence the output

current.

98[19]

C

1

Comparator input channel 1. This input senses the instantaneous voltage across the sensing

resistor, filtered by the internal digital filter or an optional external RC network.

10

9

[20]

Phase

1

Controls the direction of motor current at outputs M

M

11

10

[21]

Dis

1

Disable input for channel 1. When HIGH, all four output transistors are turned off, which results

in a rapidly decreasing output current to zero.

12

11

[22]

RC

Clock oscillator RC pin. Connect a 12 kohm resistor to V

to obtain the nominal switching frequency of 23.0 kHz and a digital filter blanking time of 1.0

µs.

13

12

[23]

V

CC

Logic voltage supply, nominally +5 V.

14

13

[24]

Dis

2

Disable input for channel 2. When HIGH, all four output transistors are turned off, which results

in a rapidly decreasing output current to zero.

15

14

[25]

Phase

2

Controls the direction of motor current at outputs M

M

16

15

[26]

C

2

Comparator input channel 2. This input senses the instantaneous voltage across the sensing

resistor, filtered by the internal digital filter or an optional external RC network.

17

16

[27]

V

R2

Reference voltage, channel 2. Controls the comparator threshold voltage and hence the output

current.

20

19

[4]

V

MM2

Motor supply voltage, channel 2, +10 to +40 V. V

21

20

[5]

M

A2

Motor output A, channel 2. Motor current flows from M

22

21

[6]

E

2

Common emitter, channel 2. This pin connects to a sensing resistor R

23

22

[7]

M

B2

Motor output B, channel 2. Motor current flows from M

Figure 2. Pin configurations

E

B2

B1

GND

RC

5

6

7

8

9

10

11

25

24

23

22

21

20

19

2

Dis

M

M

1

Dis

A1

M

1

Phase

2

NJM3775FM2

1

2

3

4

5

6

7

8

9

10

11

22

21

20

19

18

17

16

15

14

13

12

C

R2

A1

GND

GND

1

R1

CC

M

V

M

GND

GND

Phase

Dis

RC

V

M

Phase

V

V

2

2

A2

MM2

B2

2

NJM

3775D2

s PIN CONFIGURATIONS

1

2

3

4

5

6

8

9

10

11

22

21

20

19

18

17

16

15

14

13

12

GND

GND

NC

NJM

3775E3

NC

V

cc

RC

23

24

GND

GND

7