NJU7342
Single-phase DC Brushless Motor Driver IC
I
GENERAL DESCRIPTION
I
PACKAGE OUTLINE
The NJU7342 is a single-phase DC brushless motor
driver IC for small fan-motor 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.
It is suitable for small fan-motor applications.
I
FEATURES
•
Operating Voltage V
DD
=2.4
∼
5.5V
•
Low Operating Current
•
Low Saturation Output Voltage
Vsat=±0.35V @Io=±250mA
•
C-MOS Technology
•
Package Outline
VSP8/TVSP8
NJU7342R/RB1
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BLOCK DIAGLAM
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PIN FUNCTION
1
RF
RF
8
A
– +
B
+ –
2
3
4
7
6
5
1: AOUT
2: AMP-IN
3: AMP+IN
4: GND
5: NC
6: NC
7: BOUT
8: V
DD
GND
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NJU7342
I
ABUSOLUTE MAXIMUM RATINGS
PARAMETER
RATINGS
Supply Voltage
Input Voltage
Operating Temperature
Range
Storage Temperature Range
Power Dissipation
+7
-0.3
∼
V
DD
+0.3
-40
∼
+85
-50
∼
+150
400
(Ta=25°C)
NOTE
SYMBOL (unit)
V
DD
(V)
V
ID
(V)
Topr (°C)
Tstg (°C)
P
D
(mW)
Device itself
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RECOMMENDED OPERATING CONDITIONS
V
DD
=2.4V∼5.5V
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ELECTRICAL CHARACTERISTICS
PARAMETER
Input Offset Voltage
Input Common
Mode Voltage
Range
Maximum Output
Voltage Range
Operating Current
Feedback
Resistance
SYSMBOL
V
IO
V
ICM
V
OM+
V
OM -
I
DD
R
F
CONDITION
-
-
Io=+250mA
Io= -250mA
-
-
MIN.
-5
0.4∼4.0
4.55
-
-
22.0
-
-
4.65
0.35
3.0
27.5
(Ta=25°C, V
DD
=5V)
TYP.
MAX.
5
-
-
0.45
4.0
33.0
UNIT
mV
V
V
V
mA
kΩ
(Note) The oscillation comes to happen easily in the state that there is no load of current and gain is low.
In this case, please adjust the stray capacity of the output terminal to 100pF or less.
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NJU7342
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APPLICATION CIRCUIT
V
DD
1
RF
HALL
BIAS
RESISTOR
8
RF
2
3
4
A
– +
B
+ –
7
6
5
Di
Di
HALL
SENSOR
N
S
S
MOTOR
STATER
N
MOTOR
AMATEUR
Di
Di
Diodes shown in the picture indicate external re-circulating diodes.
Place re-circulaing diodes at output terminal depending on the inductive load.
The specifications on this data book are only given for
information, without any guarantee as regards either
mistakes or omissions. The application circuit in this
data book are described only to show representative
usages of the product and not intended for the guarantee
or permission of any right including the industrial rights.
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