NJM3773FM2# NJR, NJM3773FM2# Datasheet - Page 6
NJM3773FM2#
Manufacturer Part Number
NJM3773FM2#
Description
IC STEPPER MOTOR DVR DUAL 28PLCC
Manufacturer
NJR
Datasheet
1.NJM3773D2.pdf
(9 pages)
Specifications of NJM3773FM2#
Applications
Stepper Motor Driver, 2 Phase
Number Of Outputs
1
Current - Output
750mA
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#3773FM2
NJM#3773FM2
NJM#3773FM2
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Current control
The regulated output current level to the motor winding is determined by the voltage at the reference input and the
value of the sensing resistor, R
expressed as:
I
With a recommended value of 0.5 ohm for the sensing resistor R
current of approximately 500 mA. R
absolute maximum output current which is 850 mA. Chopping frequency, winding inductance and supply voltage
also affect the current, but to much less extent.
is correspondingly changed to 1 ohm for a maximum output current of 500 mA.
tolerance and low temperature coefficient.
M,peak
To improve noise immunity on the comparator inputs (V
For accurate current regulation, the sensing resistor should be a 0.5 - 1.0 W precision resistor, i. e. less than 1%
APPLICATIONS INFORMATION
= V
R
/ R
S
[A]
Figure 7. Microstepping system where a microcontroller including DACs provides
analog current control voltages as well as digital signals to the NJM3773.
Figure 6. Typical stepper motor driver application with NJM3773.
controller
Micro-
+5 V
GND (V
D/A
D/A
V
CC
CC
)
+5 V
+5 V
GND (V
S
82 k
82 k
. The peak current through the sensing resistor (and the motor winding) can be
10 k
12 k
4 700 pF
14
13
16
10
+
CC
4.7 F
9
7
S
11
should be selected for maximum motor current. Be should not to exceed the
)
Phase
Dis
V
Phase
Dis
V
RC
1000
pF
R1
10 k
R2
0.1 F
V
1
2
CC
5,
17, 18
GND
1
2
V
6,
CC
1000
pF
12
C
NJM3773
1
8
20 k
2 700 pF
14
13
16
10
0.47
9
7
V
R S
11
MM1
Phase
Dis
V
Phase
Dis
V
RC
2
R1
4
R2
E
0.1
1
2
1
5,
17, 18
GND
R
1
2
F
15
V
6,
and C), the control range may be increased to 0.5 V if R
C
CC
12
V
2
C
MM2
NJM3773
1
8
19
820 pF
0.47
1 k
0.68
S
V
R S
, a 0.25 V reference voltage will produce an output
R S
MM1
M
M
M
M
21
4
2
E
E
A1
B1
A2
B2
1
2
0.1 F
15
C
3
1
20
22
V
2
820 pF
MM2
19
1 k
0.68
R S
Pin numbers refer
to DIP package.
M
M
M
M
21
E
GND (V
A1
B1
A2
B2
+
2
10 F
STEPPER
0.1
MOTOR
3
1
20
22
V
F
MM
MM
Pin numbers refer
to DIP package.
GND (V
)
+
10
STEPPER
MOTOR
V
F
MM
MM
)
NJM3773
S