NJM37770D3# NJR, NJM37770D3# Datasheet - Page 7

• Manufacturer Part Number: NJM37770D3#
• Description: IC STEPPER MOTOR DRIVER 16-DIP
• Manufacturer: NJR

Specifications of NJM37770D3#

• Applications: Stepper Motor Driver, 2 Phase
• Number Of Outputs: 1
• Current - Output: 1.3A
• Voltage - Load: 10 V ~ 55 V
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -20°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: 16-DIP (0.325", 8.25mm), 12 Leads + 2 Fins
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: NJM#37770D3; NJM#37770D3

■ APPLICATIONS INFORMATION
Motor selection
current through the motor, its temperature can increase, both at low- and high-speed operation.
Interference
applications. A good measure is then to decouple the circuit with a 0.1 µF ceramic capacitor, located near the package
across the power line V
close to the circuit.
connecting R
circuit board directly to the terminal connector. The motor wires should be twisted in pairs, each phase separately, when
installing the motor system.
Unused inputs
Ramping
torque of the motor must be large enough to match the combined inertia of the motor and load for all operation modes. At
speed changes, the requires torque increases by the square, and the required power by the cube of the speed change.
Ramping, i.e., controlled acceleration or deceleration must then be considered to avoid motor pullout.
V
transients being generated by the motor.
Switching frequency
choice of motor may then require other values on the R
a switching frequency above the audible range. Switching frequencies above 40 kHz are not recommended because the
current regulation can be affected.
Ver.2006-04-11
CC
Some stepper motors are not designed for continuous operation at maximum current. As the circuit drives a constant
Some stepper motors have such high core losses that they are not suited for switched-mode operation.
As the circuit operates with switched-mode current regulation, interference-generation problems can arise in some
Also make sure that the V
The ground leads between R
In order to minimize electromagnetic interference, it is recommended to route M
Unused inputs should be connected to proper voltage levels in order to obtain the highest possible noise immunity.
A stepper motor is a synchronous motor and does not change its speed due to load variations. This means that the
The supply voltages, V
Before a driver circuit board is removed from its system, all supply voltages must be turned off to avoid destructive
The motor inductance, together with the pulse time, t
, V
MM
S
and R
C
to pin 16 and pin 10 respectively.
MM
Figure 7. Typical stepper motor driver application with NJM37770
CC
and ground.
and V
Ref
S
input is sufficiently decoupled. An electrolytic capacitor should be used in the +5V rail,
, C
MM
C
, can be turned on or off in any order. Normal dv/dt values are assumed.
and circuit GND should be kept as short as possible. This applies also to the leads
off
T
, determines the switching frequency of the current regulator. The
, C
T
components than those recommended in figure 3, to obtain
A
and M
B
leads in parallel on the printed
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