NJU7343R-TE1 [NJRC]
Micro Peripheral IC,;
| 型号： | NJU7343R-TE1 |
| 厂家： | 
NEW JAPAN RADIO |
| 描述： | Micro Peripheral IC, |
| 文件： | 总6页 (文件大小：113K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
NJU7343/44/45
Single-phase DC Brushless Motor Driver IC
GENERAL DESCRIPTION
PACKAGE OUTLINE
The NJU7343/ 44/ 45 is a single-phase DC brushless
motor driver IC developed for a small fan motor. Adopting
the CMOS process, it can provide a low saturation output
voltage that is effective in high current conditions.
This driver includes Lock Detect / Auto Reset and Thermal
Shutdown Circuit for safety fan operation. Each of the
drivers has FG output (NJU7343), Half FG output
(NJU7344), and RD output (NJU7345).
It adopts small VSP10 package for downsizing and
slimming motors. It is suitable for applications for small and
high output fan motors.
NJU7343R/44R/45R
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
• CMOS Technology
• Package Outline
±5mV
VSP10
BLOCK DIAGLAM
PIN FUNCTION
1: Ct
2: FG(NJU7343),Half FG(NJU7344),
RD(NJU7345)
3: VDD
1
10
LD
4: OUT B
5: Vss
6: Vss
7: OUTA
8: VDD
9: IN-
2
9
8
7
6
3
4
5
10: IN+
TSD
(Note)
All VDD and VSS pins should be connected the
power supply and the ground respectively.
Otherwise, the electrical characteristic may not
satisfy specifications
NJU7343(FG), NJU7344(Half FG)
NJU7345(RD)
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Ver.2009-03-11
NJU7343/44/45
ABSOLUTE MAXIMUM RATINGS
(Ta=25°C)
PARAMETER
RATINGS
SYMBOL (unit)
NOTE
Supply Voltage
Input Voltage
+7.0
-0.3 ∼ VDD+0.3
1000
VDD (V)
VID(V)
Output Current (Peak)
IO PEAK (mA)
Topr (°C)
Toj (°C)
Tstg (°C)
PD (mW)
Operating Temperature Range
Junction Temperature Range
Storage Temperature Range
Power Dissipation
-40 ∼ +85
-40 ∼+150
-40 ∼+150
400
Device itself
RECOMMENDED OPERATING CONDITIONS
(VDD =5V, Ta=25°C)
PARAMETER
Supply Voltage
SYMBOL
VDD
CONDITION
Ct=0
MIN.
2.2
TYP.
MAX.
5.5
UNIT
V
5.0
Junction Temperature
Range
Tj
-
-40
-
125
°C
Input Common Mode
Voltage Range
VICM
IO
-
-
0.4
-
-
-
4.0
V
Output Current
500
mA
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Ver.2009-03-11
NJU7343/44/45
ELECTRICAL CHARACTERISTICS
(VDD =5V, Ta=25°C)
PARAMETER
SYMBOL
CONDITION
MIN.
TYP.
MAX.
UNIT
General
Operating Current
IDD
-
-
-
-
3.0
4.0
-
mA
Thermal Shutdown
Temperature
TTSD
180
°C
Thermal Shutdown
Hysteresis
THYS
-
-
50
-
°C
Hall Amplifier
Input Offset Voltage
Feedback Resistance
Open Loop Gain
VIO
RF
AV
-
-
-
-5
22.0
-
-
5
33.0
-
mV
kΩ
dB
27.5
80
Input Common Mode
Voltage Range
VICM
-
-
-
V
0.4∼4.0
Motor Output
Maximum Output
Voltage Range
VOH
VOL
Io=+350mA
Io=-350mA
Io=+500mA
Io=-500mA
4.65
4.75
0.25
0.5
-
V
-
-
-
0.35
RONH
RONL
-
-
Output Resistance
Ω
0.5
Lock Detect Circuit
Lock Detect
ICHG
-
-
-
-
0.6
0.1
-
-
µA
µA
Charge Current
Lock Detect
Discharge Current
IDCHG
Clamp Voltage
Detect Voltage
VCL
VID
-
-
-
-
2.8
0.8
-
-
V
V
Rotation Detect Output
FG L Output
IN+(10pin)=0V,IN-(9pin)=5V, RP=10kΩ
IN+(10pin)=5V,IN-(9pin)=0V, RP=10kΩ
VFG
IFG-LEAK
VFG
－
－
－
－
－
－
－
－
－
－
－
－
0.3
1.0
0.3
1.0
0.3
1.0
V
μA
V
NJU
7343
Voltage
FG H Leak
Current
Half-FG L
Output Voltage
Half-FG H
Leak Current
RD L Output
Voltage
RD H Leak
Current
NJU
7344
RP=10kΩ
IFG-LEAK
μA
V
VCL=3V, RP=10kΩ
VCL=0V, RP=10kΩ
NJU
7345
μA
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Ver.2009-03-11
NJU7343/44/45
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
C1
GND
R3
R1
VDD
Hall
element
OUTA
OUTB
IN+
IN-
Motor
R2
Ct
C2
NJU7343
VSS
FG
[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:
VCL − VID
TON = C2
[
sec
]
Ich
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Ver.2009-03-11
NJU7343/44/45
Where C2 is 0.15uF:
2.8 − 0.8
0.6×10−6
TON = 0.15×10−6 ×
[
= 0.49 sec
]
Auto Resume Time (Toff) is given by:
VCL − VID
TOFF = C2
[
sec
]
Idis
Where C2 is 0.15uF:
2.8 − 0.8
0.1×10−6
TOFF = 0.15 ×10−6 ×
[
= 3.00 sec
]
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
VCL
Ct Terminal voltage
Toff
Ton
Motor Lock protection period
Motor Loxked
Returns to normal operation
*Remarks : When VDD becomes lower than 4V,the Clamp Voltage(VCL ) 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:
VDD
5
R1+ R2 + Rin =
R1 = R2 = 300Ω
=
=1.0kΩ
Ihbias 5×10−3
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Ver.2009-03-11
NJU7343/44/45
The output voltage of hall elements is influenced by the bias current and magnetic flux density of hall elements.
The optimum input voltage of NJU7343/44/45 are 100mVp-p and higher. With such input voltage, the highest
efficiency can be obtained.
4. Design of FG output resistance (R3)
FG Out (FG: Pin2) is an open drain output and R3 is a pull up register. A typical value of R3 is 10kΩ.
The timing chart of FG Out for NJU7343/NJU7344 is as follows.
Note that the pull up resistance shall be connected to below supply voltage.
NJU7343
NJU7344
Hall input
IN+
Hall input
IN+
FG
output
FG
output
Half-
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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Ver.2009-03-11
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