NJU7327
Single-phase DC Brushless Motor Driver IC
I
GENERAL DESCRIPTION
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PACKAGE OUTLINE
The NJU7327 is a single-phase DC brushless motor
driver IC for small fan-motor and high power applications. It
features MOS-FET driver circuit for better saturation
characteristics. Slew late of amplifiers and feedback
resistors are optimized to achieve low-noise motor
operation. The NJU7327 also includes frequency generator
(FG) output for various control needs.
NJU7327R
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FEATURES
•
Operating Voltage V
DD
=3.5
∼
15V
•
FG Output
•
Internal Lock Detect
•
Low Operating Current
•
Low Saturation Output Voltage
Vsat=±0.35V @Io=±200mA
•
C-MOS Technology
•
Package Outline
VSP10
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BLOCK DIAGLAM
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PIN FUNCTION
1: LD
2: FG
3: V
SS
4: OUT B
5: V
DD
6: V
DD
7: OUT A
8: V
SS
9: IN-
10: IN+
1
LOCK
DETECT
10
2
FG
+-
9
3
8
4
AMP B
INT
AMP A
7
5
6
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NJU7327
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ABSOLUTE MAXIMUM RATINGS
PARAMETER
RATINGS
SYMBOL (unit)
V
DD
(V)
V
ID
(V)
Topr (°C)
Tstg (°C)
P
D
(mW)
(Ta=25°C)
NOTE
Supply Voltage
+18
Input Voltage
-0.3
∼
V
DD
+0.3
Operating Temperature Range
-40
∼
+85
Storage Temperature Range
-50
∼
+150
Power Dissipation
400
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RECOMMENDED OPERATING CONDITIONS
V
DD
=3.5V∼15.0V
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ELECTRICAL CHARACTERISTICS
PARAMETER
SYSMBOL
CONDITION
Operating Current
Input Offset Voltage
Input Common Mode
Voltage Range
Maximum Output
Voltage Range
Slew Rate
Lock Detect Charge
Current
Lock Detect
Discharge Current
Clamp Voltage
Detect Voltage
Thermal Shutdown
Temperature
FG H Leak Current
FG L Voltage
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DD
V
IO
V
ICM
V
OM
SR
I
CH
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DIS
V
CL
V
LD
T
TSD
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FGLEAK
V
FGL
No load
1V bias
-
Io=+200mA
Io= -200mA
RL=58.6Ω
-
-
-
-
-
Device itself
MIN.
-
-15
0.2
11.55
-
46.2
0.70
0.20
2.5
0.54
-
-
-
(V
DD
=12V, Ta=25°C)
TYP.
MAX.
UNIT
3.0
-
-
11.70
0.30
60.0
1.25
0.40
2.6
0.60
180
-
-
4.0
15
8.0
-
0.45
85.7
2.25
0.80
2.7
0.66
-
1.0
0.3
mA
mVp-p
V
V
mV/µS
µA
µA
V
V
°C
µA
V
IN+=12V, IN-=0V, R
P
=10kΩ
IN+=0V, IN-=12V, R
P
=10kΩ
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NJU7327
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APPLICATION NOTE
The NJU7327 is a single-phase DC brushless motor driver IC in small VSP-10 package.
With minimal external components, it can drive up to 200mA of motor current for small fan application.
[Application Circuit Example]
V+
GND
R3
R1
Hall
element
VDD
IN+
IN-
R2
LD
C2
VSS
FG
FG out
D1
C1
OUTA
Motor
NJU7327
OUTB
[Design Notes]
Above application example is designed for 12V operation with motor current of 200mA. 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 () and Auto Resume Time (Toff).
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