NJU7347 New Japan Radio Co.,Ltd, NJU7347 Datasheet - Page 6

• Manufacturer Part Number: NJU7347
• Description: Nju7347 Single-phase Dc Brushless Motor Driver Ic
• Manufacturer: New Japan Radio Co.,Ltd

NJU7347
[Design Notes]
1. Selection of C1 and D1:
2. Lock Protection Function (Design of C2 value):
[Application Circuit Example]
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APPLICATION NOTE
The NJU7347 is a single-phase DC brushless motor driver IC in small VSP10 package.
With minimal external components, It can drive up to 200mA of motor current for small fan application.
components:
Hall elements: HW101A (AKE)
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. A value of C2 determines Lock detection time (T
Lock detection time (Ton) is given by:
Above application example is designed for 12V operation with motor current of 200mA. It uses the following
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
T
ON
GND
V
DD
C
2
D1
V
CL
I
CHG
element
C1
V
Hall
ID
R2
R1
sec
C2
IN+
IN-
LD
V
SS
NJU7347
V
DD
OUTA
OUTB
on
) and Auto Resume Time (Toff).
FG
FG out
R3
Motor