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NJU7332
Single-phase DC Brushless Motor Driver IC
■■■■ GENERAL DESCRIPTION
The NJU7332 is a single-phase DC brushless mot or driver IC
for very small fan-m otor application. It features MOS-FET dri ve
circuit for better saturation characteristics. Slew late of amplifiers
and feedback resistors are optimized to achie ve low-noise moto
operation.
NJU7332 adopt a very small FFP package, therefore it is
suitable for micro motor applications.
FEATURES
■■■■
• Sin gle S upp ly
• Operating Voltage V
• Low Operating Current
• Low Saturation Output Voltage
• C-M OS Technology
• Package Outline FFP12 (2×2×0 .85mm)
■■■■
PIN CONFIGURATIONS
=2.4 ∼ 5.5V
DD
Vsat=±0.2V @Io=±100mA
VDD
OUT B
VDD
■■■■
Preliminary
PACKA GE OUTLINE
VDD
NJU7332PB1
OUT A
Ver.2003-03-19
OUT B
IN+
12pin
1
in
VSS
Top view
VSS
IN-
OUT
IN-
-1 -
NJU7332
Preliminary
■■■■
ABUSOLUTE MAXI MUM RA TINGS (Ta=25°C)
PARAMETER RATINGS SYNBOL(unit) NOTE
Supply Voltage +7.0 V
Input V olt age
Operating Temperature Range
Storage Temperature Range
-0.3 ∼ V
DD
-40 ∼ +85
-50 ∼ +1 50
+0.3
(V)
DD
V
(V)
ID
T opr (
Tstg (
°C
°C
)
)
Power Dissi patio n 300 PD (mW) 1)
1) When mounted on a grass epoxy board.
■■■■
RECOMMENDED OPERATING CONDITIONS
=2.4V∼5.5V
V
DD
■■■■
ELECTRICAL CHARA CTERISTICS (V
+
=5V , T a=25°C)
PARAMETER SYSMBOL CONDITION MIN. TYP. MAX. UNIT
Operating Current IDD - - 3.0 4.0 mA
Input Offset Voltage VIO - -10 - -10 mV
Input Common Mode
Voltage Range
-
V
ICM
0.4∼4.0
- - V
Maximum Output
Io=+100mA 4.70 4.80 - V
V
Voltage Range
OM
Feedback Resistance
R
F
Io= -100mA - 0.20 0.30
- 22.0 27.5 33.0
kΩ
Open Loop Gain
Av - - 80 - dB
- 2 -
Ver.2003-03-19
NJU7332
■■■■ TYPICAL CHARACTERISTICS
2
1.8
1.6
1.4
1.2
1
0.8
ICC(mA)
0.6
0.4
0.2
0
012345678
200
180
160
140
120
100
80
VDD(mV)
60
40
20
0
012345678
Preliminary
VDD vs. ICC
IN-=VDD, IN+=0V, VSS=0V
VDD(V)
VDD-VOM(L level)
Iout=100mA, IN-=0V, IN+=VDD/2, VSS=0V
VDD(V)
Ver.2003-03-19
Io-Vom(Ｌ level)
VDD=5V, IN-=0V, IN+=VDD/2, VSS=0V
2
1.8
1.6
1.4
1.2
1
Vo(V)
0.8
0.6
0.4
0.2
0
0 200 400 600 800 1000 1200
Io(mA)
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NJU7332
Preliminary
■■■■ TYPICAL CHARACTERISTICS
200
175
150
125
100
VOM(mV)
75
50
25
0
012345678
VDD-VOM(H level)
Iout=100mA, IN-=0V, IN+=VDD/2, VSS=0V
VDD(V)
Io-Vom(Ｈ level)
VDD=5V, IN- = 0V, IN+=VDD/2, VSS=0V
1.8
1.6
1.4
1.2
1
0.8
Vom(V)
0.6
0.4
0.2
0
0 200 400 600 800 1000 1200
Io(mA)
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Ver.2003-03-19
R
R
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s
g
■
APPLICATION NOTE
The NJU7332 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]
V+
D1
GND
C1
R3
R1
NJU7332
Preliminary
Hall
element
R2
IN+
IN-
Ct
C2
VSS
VDD
NJU7332
OUTA
OUTB
FG
Motor
FG out
[Design Notes]
Above application example is designed for 5V operation with motor current of 100mA. 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. 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 dat asheet, R1 and R2 can be determined as
21
RinRR
VDD
Ihbias
Ω==
30021
5
==++
−
×
105
Ω=
1
k
3
follows:
The output voltage of hall elements is influenced by the bias current and magnetic flux density of hall elements.
The optimum input voltage of NJU7332 is 100mVp-p and higher. With such input voltage, the highest efficiency can
be obtained.
The specificat i ons on t hi s data b ook ar e onl y gi ven f or inf o rm ation, witho ut an
guarantee as regards either mistakes or omissions. The application circuit in thi
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
hts.
ri
Ver.2003-03-19
-5 -
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