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PDF NJU7332 Data sheet ( Hoja de datos )
| Número de pieza | NJU7332 | |
| Descripción | FAN Motor / FFP12-B1 / TVSP8 | |
| Fabricantes | JRC | |
| Logotipo |  |
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www.DataSheet4U.com
NJU7332
Single-phase DC Brushless Motor Driver IC
GENERAL DESCRIPTION
The NJU7332 is a single-phase DC brushless motor
driver
IC for very small fan-motor application. It features MOS-FET
driver circuit for better saturation characteristics. Slew late of
amplifers and feedback resistors are optimized to achieve
low-noise motor operation.
The NJU7332 adopt a very small FFP package, therefore
it is suitablefor micro motor applications.
PACKAGE OUTLINE
NJU7332PB1
FEATURES
Single supply
Operating Voltage VDD 2.4 5.5V
Low Operating Current
Low Saturation Output Voltage
Vsat= 0.2V @Io= 100mA
C-MOS Technology
Package Outline
TVSP8/FFP12 (2mm 2mm 0.85mm)
BLOCK DIAGRAM PIN CONFIGURATIONS
18
RF RF
OUT B
2A
–+
3
B
+–
7
OUT B
6
VDD
4
GND
5 IN+ 12pin
1pin
VSS
VDD
Top view
VSS
VDD
IN-
OUTA
IN-
FFP12
TVSP8
Ver.2007-02-20
-1-
1 page  
www.DataSheet4U.com
APPLICATION NOTE
The NJU7332 is a signal-phase DC brushless motor driver IC featuring CMOS process.
It is suitable for fan drivers for a small equipment such as the note personal computers.
[Application Circuit Example]
V+
D1
C1
GND
NJU7332
R1
Hall
element
R2
VDD
IN+
IN-
OUTA
OUTB
NJU7332
VSS
Motor
[Design Notes]
Above application example is designed for 5V operation with motor current of 100mA, it uses the following
components:
Hall Elements: HW101A(AKE)
SECTION of C1 and D1:
C1 used for a noise reduction purpose. A typical value is 0.1µF.
Optimize the value in actual operating condition if necessary. D1 is a diode for protection against reverse voltage
supply. Silicon rectifier diode(WO3C, 10D1, and equivalent) is appropriate.
Design of hall element bias resistance (R1 and R2)
Hall amplifier is a differential with hysteresis characterics(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 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 seletcted for R1 and R2.
Given that the bias current is set to be 5mA by HW101A datasheet, R1 and R2 can be determined as
R1+ R2 + Rin
=
VDD
Ihbias
=
5
5 ×10−3
= 1kΩ
R1 = R2 = 300Ω
follows:
The output voltage of hall elements is influnenced by the bias current and magnetic flux density of hall elements.
The optimum input voltage of the NJU7332 is 100mVp-p and higher. With such input voltage, the highest
efficiency can be obtained.
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook 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.2007-02-20
-5-
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet NJU7332.PDF ] | |
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