NJM3771FM2 NJR, NJM3771FM2 Datasheet - Page 8

• Manufacturer Part Number: NJM3771FM2
• Description: IC STEPPER MOTOR DUAL DVR 28PLCC
• Manufacturer: NJR
• Type: Stepper Motor Controller/Driverr

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
• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 7 V
• Supply Current: 50 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

General
Phase inputs
A logic HIGH on a Phase input gives positive current flowing out from M
the opposite direction.
Slow/fast current decay
Heat sinking
Soldering the four center pins onto a free PCB copper area of 20 cm
35 m) permits the circuit to operate with a maximum of 320 mA output current, both channels driving, at ambient
temperatures up to +70 C. Consult figures 9 and 14 in order to determine the necessary copper area for heat
sinking if higher currents are required.
Thermal shutdown
The circuit is equipped with a thermal shutdown function that reduces the output current at chip temperatures
above +160 C.
Figure 9. Thermal Resistance vs. PC Board copper area and suggested layout
A logic HIGH on the CD input gives slow current decay, a logic LOW gives fast current decay.
80
70
60
50
40
30
20
Thermal resistance [ C/W]
PLCC package
DIP package
5
PCB copper foil area [cm ]
10
15
20
25
2
30
35
24-pin EMP
2
(approx. 1.8" x 1.8", copper foil thickness =
A
into M
B
. A logic LOW gives a current in
22-pin
28-pin
PLCC
DIP
NJM3771