NJM37770D3# NJR, NJM37770D3# Datasheet - Page 3

• 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

■ FUNCTIONAL DESCRIPTION
Input logic
Phase input
M
the risk of cross conduction in the output stage during a phase shift.
Ver.2006-04-11
The NJM37770 is intended to drive a bipolar constant current through one winding of a 2-phase stepper motor.
Current control is achieved through switched-mode regulation, see figure 3 and 4.
Three different current levels and zero current can be selected by the input logic.
The circuit contains the following functional blocks:
● Input logic
● Current sense
● Single-pulse generator
● Output stage
The phase input determines the direction of the current in the motor winding. High input forces the current from terminal
A
Half- and full-step operation is possible.
to M
Figure 3. Output stage with current
pathsfor fast and slow current
decay.
B
and low input from terminal M
B
to M
A
. A Schmitt trigger provides noise immunity and a delay circuit eliminates
Figure 4. Motor current (I
Vertical : 200 mA/div,
Horizontal: 1 ms/div,
expanded part 100 µs/div.
M
),
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