NJM3774 New Japan Radio, NJM3774 Datasheet - Page 2

• Manufacturer Part Number: NJM3774
• Description: DUAL STEPPER MOTOR DRIVER
• Manufacturer: New Japan Radio

Figure 2. Pin configurations
PLCC
1-3, 9, 5, 6
13-17 17, 18
28
4
5
6
7
8
10
11
12
18
19
20
21
22
23
24
25
26
27
PIN CONFIGURATIONS
PIN DESCRIPTION
DIP
8
9
10
11
12
13
14
15
16
19
20
21
22
1
2
3
4
7
Symbol
GND
M
V
E
M
M
E
V
M
Dis
Phase
V
C
V
RC
C
V
Phase
Dis
MM2
2
1
MM1
R1
CC
R2
1
2
A2
B2
B1
A1
GND
V
V
M
M
1
2
MM2
MM1
E
E
B2
B1
2
1
10
11
1
2
5
6
7
8
9
Description
Ground and negative supply. Note: these pins are used thermally for heat-sinking. Make sure that all
ground pins are soldered onto a suitably large copper ground plane for efficient heat sinking.
Motor output A, channel 2. Motor current flows from M
Motor supply voltage, channel 2, +10 to +40 V.V
Common emitter, channel 2. This pin connects to a sensing resistor R
Motor output B, channel 2. Motor current flows from M
Motor output B, channel 1. Motor current flows from M
Common emitter, channel 1. This pin connects to a sensing resistor R
Motor supply voltage, channel 1, +10 to +40 V. V
Motor output A, channel 1. Motor current flows from M
Disable input (TTL level compatible) for channel 1. When HIGH, all four output transistors are turned
off, which results in a rapidly decreasing output current to zero.
Controls the direction of motor current at outputs M
when Phase
Ref. voltage, channel 1. Controls the threshold voltage for the comparator and hence the output
current.
Comparator input channel 1. This input senses the instantaneous voltage across the sensing resistor,
filtered by an RC network. The threshold voltage for the comparator is V
mV at V
Logic voltage supply, nominally +5 V.
Clock oscillator RC pin. Connect a 15 kohm resistor to V
the nominal switching frequency of 26.5 kHz.
Comparator input channel 2. This input senses the instantaneous voltage across the sensing resistor,
filtered by an RC network. The threshold voltage for the comparator is V
at V
Ref. voltage, channel 2. Controls the threshold voltage for the comparator and hence the output
current.
Controls the direction of motor current at outputs M
when Phase
Disable input (TTL level compatible) for channel 2. When HIGH, all four output transistors are turned
off, which results in a rapidly decreasing output current to zero.
NJM3774FM2
R2
= 2.5 V.
R1
= 2.5 V.
1
2
is HIGH.
is HIGH.
25
24
23
22
21
20
19
V
C
RC
V
C
V
Phase
CC
R2
R1
2
1
1
MM1
MM1
A1
A2
Phase
and V
and V
V
and M
and M
GND
GND
A2
A2
A1
A1
V
Dis
M
MM2
M
RC
C
E
R2
A2
B2
to M
to M
to M
to M
2
CC
2
2
2
MM2
MM2
10
11
and a 3300 pF capacitor to ground to obtain
B1
B2
1
2
3
4
5
6
7
8
9
B2
B2
B1
B1
. Motor current flows from M
. Motor current flows from M
should be connected together.
should be connected together.
when Phase
when Phase
when Phase
when Phase
3774D2
NJM
S
S
to ground.
to ground.
CH2
CH1
= 0.18 • V
= 0.18 • V
2
2
1
1
22
21
20
19
18
17
16
15
14
13
12
is HIGH.
is HIGH.
is HIGH.
is HIGH.
C
E
V
Phase
GND
GND
Dis
V
M
V
M
CC
1
R1
MM1
1
A1
B1
1
NJM3774
R2
1
R1
[V], i.e. 450 mV
[V], i.e. 450
A1
A2
to M
to M
B1
B2