NJM2644M NJR, NJM2644M Datasheet - Page 4

• Manufacturer Part Number: NJM2644M
• Description: Motor / Motion / Ignition Controllers & Drivers 2-Phase DC Brushless Motor Pre-driver IC
• Manufacturer: NJR
• Type: 2 Phase Unipolar DC Brushless Motor Driverr

Specifications of NJM2644M

• Supply Current: 4.4 mA
• Mounting Style: SMD/SMT
• Package / Case: DMP-8
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

NJM2644
equipment where 12V operation is required.
[Application Circuit Example]
[Design Notes]
components:
1. Selection of C1 and D1:
2. Lock Protection Function (Design of C2 value):
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APPLICATION NOTE
The NJM2644 is a two-phase motor unipolar pre-driver IC. It is suitable for fan motor drivers for communication
Above application example is designed for 12V operation with motor current of 300mA. It uses the following
supply. Silicon rectifier diode (WO3C, 10D1 and equivalent) is appropriate.
a motor and a driver circuit from fatal destruction in case of motor halt.
safety operation. When Lock Detection is activated; FG Output (FG: Pin 3) goes to L.
GND
Hall Elements: HW101A (AKE)
TR1,TR2: 2SD2475 (Panasonic)
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 reverse voltage
Lock Protection Function, consists of Motor Lock Detection and Auto Resume Function, is a safety feature to protect
Motor Lock Detection detects motor halt due to irregular load conditions and then cuts motor driving current f or
A value of C2 determines Lock detection time (Ton) and Auto Resume Time (Toff).
Lock detection time (Ton) is given by:
V+
T
D1
ON
C
C1
2
element
Vch
Hall
Ic
R1
R2
Vcl
C2
sec
GND
H1
H2
Ct
NJM2644
VCC
Ra
Ca
OUT1
OUT2
FG
R3
R4
R5
ZD1
R4
TR1
R5
Motor
ZD2
ZD1
TR2
ZD2