NJU7329A
Single-phase DC Brushless Motor Driver IC
■ GENERAL DESCRIPTION
■ PACKAGE OUTLINE
The NJU7329A 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 NJU7329A also includes. Frequency
generator (FG) output for various control needs.
NJU7329ARB2
■ FEATURES
• Operating Voltage VDD=2.4 ∼ 5.5V
• FG Output
• Internal Lock Detect / Auto Recovery Circuit
• Internal Thermal Shutdown Circuit
• Low Operating Current IDD=3mA (Typ.)
• Low Saturation Output Voltage
Vsat=±0.35V @Io=±350mA
• C-MOS Technology
• Package Outline
TVSP10
■ BLOCK DIAGLAM
1
■ PIN FUNCTION
TSD
10
9
2
RF
RF
3
8
4
1: NC
2: OUT A
3: IN4: IN+
5: GND
6: NC
7: Ct
8: FG
9: OUT B
10: VDD
7
Lock Detect
5
Ver.2003-07-28
6
-1-
NJU7329A
■ ABSOLUTE MAXIMUM RATINGS
PARAMETER
RATINGS
SYMBOL (unit)
Supply Voltage
+7.0
Input Voltage
-0.3 ∼ VDD+0.3
Output Current (Peak)
600
Operating Temperature Range
-40 ∼ +85
Storage Temperature Range
-50 ∼ +150
Power Dissipation
400
■ RECOMMENDED OPERATING CONDITIONS
VDD=2.4V∼5.5V
■ ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
CONDITION
(Ta=25°C)
NOTE
VDD (V)
VID(V)
IO PEAK (mA)
Topr (°C)
Tstg (°C)
PD (mW)
Device itself
MIN.
TYP.
(VDD =5V, Ta=25°C)
MAX.
UNIT
Operating Current
IDD
-
-
3.0
4.0
mA
Input Offset Voltage
VIO
-
-15
-
15
mV
Input Common Mode
Voltage Range
VICM
-
0.4∼4.0
-
-
V
Maximum Output
Voltage Range
Io=+350mA
4.55
4.65
-
VOM
Io= -350mA
-
0.35
0.45
VLOP
-
4.0
-
-
V
V
Lock Protect
Operating Voltage
Lock Detect Charge
Current
Lock Detect
Discharge Current
ICHG
-
-
1.5
-
µA
IDCHG
-
-
0.5
-
µA
Clamp Voltage
VCL
-
-
2.6
-
V
Detect Voltage
VID
-
-
0.6
-
V
Thermal Shutdown
Temperature
TTSD
-
-
180
-
°C
Feedback Resistance
RF
-
22.0
27.5
33.0
kΩ
FG H Leak Current
IFG-LEAK
4pin=0V, 3pin=5V
-
-
1.0
µA
FG L Voltage
VFG
4pin=5V, 3pin=0V, R3=10kΩ
-
-
0.3
V
-2-
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NJU7329A
■TIMING CHART
IN+
IN-
OUTA
OUTB
Ct
FG
Ver.2003-07-28
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NJU7329A
■ TYPICAL CHARACTERISTICS
VDD-IDD
IN-=VDD, IN+=0V, Ct=0V, VSS=0V
VDD-VOM(BTL)[AMPA=H]
Iout=350mA, IN-=0V, IN+=VDD/2, Ct=0V, VSS=0V
4.0
10.0
3.5
9.0
8.0
3.0
7.0
6.0
VOM[V]
IDD[mA]
2.5
2.0
5.0
4.0
1.5
3.0
1.0
2.0
0.5
1.0
0.0
0.0
0
1
2
3
4
5
6
7
0
8
1
2
3
4
1.0
4.0
0.9
3.7
0.8
3.4
0.7
3.1
0.6
2.8
0.5
0.4
7
8
2.5
2.2
0.3
1.9
0.2
1.6
1.3
0.1
1.0
0.0
0
1
2
3
4
5
6
7
2
8
2.5
3
3.5
1.0
0.45
0.9
0.40
0.8
0.35
0.7
0.30
0.6
VID[V]
0.50
0.25
0.20
0.3
0.2
0.05
0.1
0.00
3.5
4
VDD[V]
5.5
6
0.4
0.10
3
5
0.5
0.15
2.5
4.5
VDD-VID
IN-=VDD, IN+=0V, VSS=0V, Ct=H→L
VDD-IDCHG
IN-=VDD, IN+=0V, VSS=0V
2
4
VDD[V]
VDD[V]
IDCHG[μA]
6
VDD-VCL
IN-=VDD/2, IN+=0V, VSS=0V, Ct=L→H
VCL{V]
VOM[V]
VDD-VOM(BTL)[AMPB=L]
Iout=350mA, IN-=0V, IN+=VDD/2, Ct=0V, VSS=0V
-4-
5
VDD[V]
VDD[V]
4.5
5
5.5
6
0.0
2
2.5
3
3.5
4
4.5
5
5.5
6
VDD[V]
Ver.2003-07-28
NJU7329A
■ TYPICAL CHARACTERISTICS
VDD-ICHG
IN-=VDD, IN+=0V, VSS=0V
1.5
1.3
ICHG[μA]
1.1
0.9
0.7
0.5
0.3
2
2.5
3
3.5
4
4.5
5
5.5
6
VDD[V]
Iout-VOM(BTL)[AMPA=H]
VDD=5V, IN-=0V, IN+=VDD/2, Ct=0V, VSS=0V
5.00
4.95
4.90
VOM[V]
4.85
4.80
4.75
4.70
4.65
4.60
4.55
0
100
200
300
Iout[mA]
400
500
600
Iout-VOM(BTL)[AMPB=L]
VDD=5V, IN-=0V, IN+=VDD/2, Ct=0V, VSS=0V
0.50
0.45
0.40
VOM[V]
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
0
100
200
300
400
500
600
Iout[mA]
Ver.2003-07-28
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NJU7329A
■ TYPICAL CHARACTERISTICS
IFG-VFG
VDD=5V, VSS=0V, IN-=VDD/2, IN+=0V, Ct=0V
1600
1400
VFG(mV)
1200
1000
800
600
400
200
0
0
2
4
6
8
10
12
IFG(mA)
■ APPLICATION NOTE
The NJU7329A 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]
VDD
D1
C1
GND
R3
R1
VDD
Hall
element
IN+
OUTA
Motor
INR2
Ct
OUTB
NJU7329A
C2
VSS
FG
-6-
FG out
Ver.2003-07-28
NJU7329A
[Design Notes]
Above application example is designed for 5V operation with motor current of 350mA. 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:
TON = C 2
VCL − VID
[sec]
ICHG
Where C2 is 0.47uF:
TON = 0.47 × 10 − 6 ×
2 .6 − 0 . 6
= 0.62[sec ]
1.5 × 10 − 6
Auto Resume Time (Toff) is given by:
TOFF = C 2
VCL − VID
[sec]
IDCHG
Where C2 is 0.47uF:
TOFF = 0.47 × 10 − 6 ×
2.6 − 0.6
= 1.88[sec ]
0.5 × 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.
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NJU7329A
A typical value of C2 is either 0.47uF or 1uF depending on a motor.
Hall input
Motor output
Ct Terminal voltage
Toff
Ton
Motor Lock protection period
Motor Locked
Returns to normal operation
3. Design of hall element bias resistance (R1 and R2)
Hall amplifier is a differential amplifier with hysteresis characteristics (24mV typical).
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:
R1 + R 2 + Rin =
R1 = R 2 = 300 Ω
VDD
5
=
= 1kΩ
Ihbias 5 × 10 −3
The output voltage of hall elements is influenced by the bias current and magnetic flux density of hall elements.
The optimum input voltage of NJU7329A is 100mVp-p and higher. With such input voltage, the highest efficiency can
be obtained.
4. Design of FG output resistsnce (R3)
FG Out(FG:Pin8) is a open drain output and R3 is a pull up register. A typical value of R3 is 10kΩ. The timing chart
of FG Out is as follows.
Hall input
IN+
FG Terminal voltage
-8-
Ver.2003-07-28
NJU7329A
■ OUTPUT VOLTAGE vs OUTPUT CURRENT CHARASTERISTICS
NJU7329
Upper Output Voltage vs.
Output Current
0.5
VDD=5V
Ta=25degC
O UT PUT VOLTAGE [V]
0.4
0.3
0.2
0.1
0
0
100
200
300
400
500
600
700
OUTPUT CURRENT [mA]
NJU7329
Lower Output Voltage vs.
Output Current
0.5
VDD=5V
Ta=25degC
O UTPUT VOLTAGE [V]
0.4
0.3
0.2
0.1
0
0
100
200
300
400
500
600
700
OUTPUT CURRENT [mA]
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.
Ver.2003-07-28
-9-