NJM2640 データシートの表示（PDF） - Japan Radio Corporation
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NJM2640 Datasheet PDF : 7 Pages
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NJM2640
♦NJM2640 application note
The NJM2640 is a two-phase motor unipolar pre-driver IC featuring 60V operating high voltage process
technology.
It is suitable for fan motor drivers for communication equipment where 48V operation is required.
[Application Circuit Example]
V+
D1
C1
GND
R1
Hall
element
R2
Ra
Ca
R3
ZD1
Motor
VCC
H1
OUT1
H2
R4
R5
TR1
ZD2
ZD1
[Design Notes]
Ct
OUT2
C2
NJM2640
R4
R5
GND
LA
Lock alarm out
TR2
ZD2 D2
Above application example is designed for 48V operation with motor current of 300mA. It uses the following
components:
Hall Elements: HW101A (AKD)
TR1,TR2: 2SD0968A (NEC)
1. Selection of C1 and D1:
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 supply. Silicon rectifier diode (WO3C, 10D1 and equivalent) is appropriate.
2. Lock Protection Function (Design of C2 value):
Lock Protection Function, consists of Motor Lock Detection and Auto Resume Function, is a safety
feature to protect a motor and a driver circuit from fatal destruction in case of motor halt.
Motor Lock Detection detects motor halt due to irregular load conditions and then cuts motor driving
current f or safety operation. When Lock Detection is activated; Lock Alert Out (LA: Pin 3) goes to L.
A value of C2 determines Lock detection time (Ton) and Auto Resume Time (Toff).
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