NJM2640E NJR, NJM2640E Datasheet - Page 4

• Manufacturer Part Number: NJM2640E
• Description: Motor / Motion / Ignition Controllers & Drivers 2-Phase DC Brushless Motor Pre-Driver IC
• Manufacturer: NJR
• Type: Two Phase Unipolar DC Brushless Motor Pre-Driver ICr

Specifications of NJM2640E

• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 4 V to 55 V
• Supply Current: 3 mA to 4 mA
• Mounting Style: SMD/SMT
• Package / Case: EMP-8
• Operating Temperature: - 40 C to + 85 C
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

NJM2640
technology.
[Application Circuit Example]
[Design Notes]
components:
1. Selection of C1 and D1:
2. Lock Protection Function (Design of C2 value):
GND
V+
- 4 -
The NJM2640 is a two-phase motor unipolar pre-driver IC featuring 60V operating high voltage process
It is suitable for fan motor drivers for communication equipment where 48V operation is required.
Above application example is designed for 48V operation with motor current of 300mA. It uses the following
reverse voltage supply. Silicon rectifier diode (WO3C, 10D1 and equivalent) is appropriate.
feature to protect a motor and a driver circuit from fatal destruction in case of motor halt.
current f or safety operation. When Lock Detection is activated; Lock Alert Out (LA: Pin 3) goes to L.
NJM2640 application note
Hall Elements: HW101A (AKD)
TR1,TR2: 2SD0968A (NEC)
C1 is used for a noise reduction purpose. A typical value is 0.1uF.
Optimize the value in actual operating conditions if necessary. D1 is a diode for protection against
Lock Protection Function, consists of Motor Lock Detection and Auto Resume Function, is a safety
Motor Lock Detection detects motor halt due to irregular load conditions and then cuts motor driving
A value of C2 determines Lock detection time (Ton) and Auto Resume Time (Toff).
D1
C1
element
Hall
R1
R2
C2
GND
H1
H2
Ct
NJM2640
VCC
Ra
Ca
OUT1
OUT2
LA
Lock alarm out
R3
R4
R5
ZD1
R4
TR1
R5
Motor
ZD2
ZD1
TR2
ZD2
D2