NJM3771FM2# NJR, NJM3771FM2# Datasheet - Page 6

• Manufacturer Part Number: NJM3771FM2#
• Description: IC STEPPER MOTOR DUAL DVR 28PLCC
• Manufacturer: NJR

Specifications of NJM3771FM2#

• Applications: Stepper Motor Driver, 2 Phase
• Number Of Outputs: 1
• Current - Output: 650mA
• Voltage - Load: 10 V ~ 40 V
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -20°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 28-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: NJM#3771FM2; NJM#3771FM2

Current control
The output current to the motor winding is mainly determined by the voltage at the reference input and the value of
the sensing resistor, R
Fast current decay setting will produce somewhat lower (average) current than slow current decay. The peak
current through the sensing resistor (and motor winding) can be expressed as:
i.e., with a recommended value of 1 ohm for the sensing resistor, R
output current of approximately 450 mA. To improve noise immunity on the V
increased to
5 volts if R
Chopping frequency, winding inductance, and supply voltage will affect the current level, but to much less extent.
I
M,peak
APPLICATIONS INFORMATION
= 0.18 • (V
S
Figure 7. Microstepping system with NJU39610 and NJM3771
is correspondingly changed to 2 ohms.
To
+2.5V
P
R
GND
(V
V
/ R
CC
CC
14
15
16
17
22
S
Figure 6. Typical stepper motor application with NJM3771
)
S
7
6
1
(+5 V)
.
) [A]
D0
D7
A0
A1
WR
CS
RESET
V
Ref
+5 V
NJU 39610
GND
(V
V
15 k
3 300 pF
CC
CC
16
15
14
7
8
9
V
V DD
)
(+5 V)
SS
12
5
Phase
CD
V
Phase
CD
V
18
RC
R1
R2
0.1 F
1
2
5,
17, 18
GND
1
2
V
6,
Sign
Sign
CC
CD
DA
CD
DA
11
1
1
1
2
2
2
NJM 3771
C
1
10
820 pF
19
3
20
4
2
21
1 k
+5 V
1.0
V
MM1
2
3
E
15 k
3 300 pF
1
16
15
14
7
8
9
R S
13
12
C
Phase
CD
V
Phase
CD
V
RC
R1
V
R2
2
0.1 F
1
820 pF
2
MM2
5,
17, 18
GND
20
1 k
1
1.0
2
V
6,
CC
M
M
M
M
21
11
E
A1
B1
A2
B2
NJM 3771
2
C
0.1 F
1
10
R S
820 pF
S
4
1
19
22
1 k
1.0
, a 2.5 V reference voltage will produce an
V
MM1
3
2
E
Pin numbers refer
to DIP package.
1
GND (V
R S
+
13
10 F
STEPPER
C
MOTOR
V
2
820 pF
MM2
V
R
20
1 k
MM
MM
1.0
input, the control range may be
)
21
M
M
M
M
E
A1
B1
A2
B2
2
0.1 F
R S
4
1
19
22
Pin numbers refer
to DIP package.
GND (V
+
10 F
STEPPER
MOTOR
V
MM
MM
)
NJM3771