NJU7333 データシートの表示（PDF） - Japan Radio Corporation

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NJU7333

Single-phaseDC Brushless Motor Driver IC

Japan Radio Corporation  

NJU7333

Preliminary

s APPLICATION NOTE

The NJU7333 is a single-phase DC brushless motor driver IC featuring CMOS process.

It is suitable for fan motor drivers for a small equipment such as the note personal computers.

[Application Circuit Example]

V+

D1

C1

GND

R3

R1

Hall

element

VDD

IN+

OUTA

IN-

R2

Ct

OUTB

C2

NJU7333

VSS

FG

FG out

Motor

[Design Notes]

Above application example is designed for 5V operation with motor current of 500mA. It uses the following

components:

Hall Elements: HW101A (AKE)

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. A value of C2 determines Lock detection time (Ton) and Auto Resume Time (Toff).

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