NJM3773D2 NJR, NJM3773D2 Datasheet - Page 6

• Manufacturer Part Number: NJM3773D2
• Description: IC STEPPER MOTOR DVR DUAL 22-DIP
• Manufacturer: NJR
• Type: Stepper Motor Controller/Driverr

Specifications of NJM3773D2

• 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: Through Hole
• Package / Case: 22-DIP (0.400", 10.16mm)
• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 7 V
• Supply Current: 70 mA
• Mounting Style: Through Hole
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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