NJU7343/44/45
Single-phase DC Brushless Motor Driver IC
s
GENERAL DESCRIPTION
s
PACKAGE OUTLINE
The NJU7343/ 44/ 45 are single-phase DC brushless
motor driver IC. That features MOS-FET driver circuit for
better output characteristics.
The drivers includes Lock Detect and Thermal Shutdown
Circuit. Each of the drivers includes FG output (NJU7343),
Half FG output (NJU7344), and RD output (NJU7345).
Maximum output current is 500mA and Input offset voltage
is
±7mV.
NJU7343R/44R/45R
It is suitable for 5V high current small fan-motor
applications.
s
FEATURES
•
Operating Voltage
2.2 to 5.5V
•
Lock Detect / Auto Release
•
Control Output Terminal
NJU7343:FG(Frequency Generator)
NJU7344:Half FG
NJU7345:RD(Rotation Detect)
•
Thermal Shutdown Circuit
•
Low Operating Current
•
Low Saturation Output Voltage
•
Vsat=
±0.25V
@Io=±500mA
•
Input offset voltage
±5mV
•
CMOS Technology
•
Package Outline
VSP10
s
BLOCK DIAGLAM
s
PIN FUNCTION
1: Ct
2: FG(NJU7343),Half FG(NJU7344),
RD(NJU7345)
3: V
DD
4: OUT B
5: Vss
6: Vss
7: OUT A
8: V
DD
9: IN-
10: IN+
(Note)
All
V
DD
and V
SS
pins should be connected the
power supply and the ground respectively.
Otherwise, the electrical characteristic may not
satisfy specifications
1
LD
10
2
3
9
8
4
TSD
7
5
6
NJU7343(FG), NJU7344(Half FG)
NJU7345(RD)
-1-
Ver.5.2
NJU7343/44/45
s
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Input Voltage
Output Current (Peak)
Operating Temperature Range
Storage Temperature Range
Power Dissipation
(Ta=25°C)
NOTE
RATINGS
+7.0
-0.3
∼
V
DD
+0.3
1000
-40
∼
+85
-50
∼
+150
400
SYMBOL (unit)
V
DD
(V)
V
ID
(V)
I
O PEAK
(mA)
Topr (°C)
Tstg (°C)
P
D
(mW)
Device itself
s
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
CONDITION
Supply Voltage
Junction Temperature
Range
Input Common Mode
Voltage Range
Output Current
V
DD
Tj
V
ICM
I
O
Ct=0
-
-
-
MIN.
2.2
-40
0.4
-
(V
DD
=5V, Ta=25°C)
TYP.
MAX.
UNIT
5.0
-
-
-
5.5
125
4.0
500
V
°C
V
mA
-2-
NJU7343/44/45
s
ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
General
Operating Current
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis
Hall Amplifier
Input Offset Voltage
Feedback Resistance
Open Loop Gain
Input Common Mode
Voltage Range
Output
Maximum Output
Voltage Range
Output Resistance
FG(RD) L Output
Voltage
FG(RD) H Leak
Current
Lock Detect Circuit*
Lock Protect
Operation Voltage
Lock Detect
Charge Current
Lock Detect
Discharge Current
Clamp Voltage
Detect Voltage
V
OH
V
OL
R
ONH
R
ONL
V
FG
I
FG-LEAK
Io=+350mA
Io=-350mA
Io=+500mA
Io=-500mA
9pin=0V, 10pin=5V, R
3
=10kΩ
9pin=5V, 10pin=0V, R
3
=10kΩ
4.65
-
-
-
-
-
4.80
0.20
0.5
0.5
-
-
-
V
0.35
-
-
0.3
1.0
Ω
V
µA
V
IO
R
F
A
V
V
ICM
-
-
-
-
-5
22.0
-
0.4∼4.0
-
27.5
80
-
5
33.0
-
-
mV
kΩ
dB
V
I
DD
T
TSD
T
HYS
-
-
-
-
-
-
3.0
180
50
4.0
-
-
mA
°C
°C
(V
DD
=5V, Ta=25°C)
TYP.
MAX.
UNIT
CONDITION
MIN.
V
LOP
I
CHG
I
DCHG
V
CL
V
ID
-
-
-
-
-
4.0
-
-
-
-
-
0.6
0.1
2.8
0.8
-
-
-
-
-
V
µA
µA
V
V
-3-
NJU7343/44/45
s
APPLICATION NOTE
The NJU7343/44/45 are single-phase DC brushless motor driver IC in small VSP-10 package.
With minimal external components, that can drive up to 500mA of motor current for small fan application.
[Application Circuit Example]
V+
D1
GND
R3
R1
VDD
Hall
element
IN+
IN-
R2
Ct
C2
OUTB
OUTA
Motor
C1
NJU7343/44/45
VSS
FG,1/2FG,RD
FG,Half-FG,RD out
[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).
Lock detection time (Ton) is given by:
T
ON
=
C
2
V
CL
−
V
ID
[
sec
]
Ich
-4-
NJU7343/44/45
Where C2 is 0.15uF:
T
ON
=
0.15
×
10
−
6
×
2 .8
−
0 . 8
=
0.49
[
sec
]
0.6
×
10
−
6
Auto Resume Time (Toff) is given by:
T
OFF
=
C
2
V
CL
−
V
ID
[
sec
]
Idis
2 .8
−
0 . 8
=
3.00
[
sec
]
−
6
0.1
×
10
Where C2 is 0.15uF:
T
OFF
=
0.15
×
10
−
6
×
In actual application, Lock detection time (Ton) is affected by the mechanical time constant of a motor. Therefore,
constant start up must be confirmed in actual evaluation taking operating variations (i.e. Temperature, Voltage change
and so on) in consideration.
A typical value of C2 is either from 0.1uF to 0.47uF depending on a motor.
Hall input
Motor output
V
CL
Ct Terminal voltage
Toff
Ton
Motor Lock protection period
Motor Loxked
Returns to normal operation
*Remarks : When
V
DD
becomes lower than 4V,the Clamp Voltage(V
CL
) becomes lower
accordingly. This makes Ton and Toff shorter and may cause issues associated
with the restarting of the motor from the lock protection state.Therefore, careful
evaluation is necessary with actual motors.
3. Design of hall element bias resistance (R1
and R2)
Hall amplifier is a differential amplifier.
The common-mode input voltage is between 0.4V and VDD-1V and the input signal must be within the range.
Non-excitation hall bias voltage is to be set at a half of VDD for effective use of common-mode input voltage range.
Therefore the same value of hall bias resistors is selected for R1 and R2.
Given that the bias current is set to be 5mA by HW101A datasheet, R1 and R2 can be determined as follows:
R
1
+
R
2
+
Rin
=
R
1
=
R
2
=
300
Ω
5
VDD
=
=
1.0
k
Ω
Ihbias
5
×
10
−
3
-5-
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