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PDF NJU7344 Data sheet ( Hoja de datos )
| Número de pieza | NJU7344 | |
| Descripción | (NJU7343 - NJU7345) FAN Motor / VSP10 | |
| Fabricantes | JRC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de NJU7344 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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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.
It is suitable for 5V high current small fan-motor
NJU7343R/44R/45R
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
LD
2
3
4
5
TSD
NJU7343(FG), NJU7344(Half FG)
NJU7345(RD)
1: Ct
2: FG(NJU7343),Half FG(NJU7344),
10 RD(NJU7345)
3: VDD
4: OUT B
9 5: Vss
6: Vss
7: OUT A
8 8: VDD
9: IN-
7 10: IN+
(Note)
6 All VDD and VSS pins should be connected the
power supply and the ground respectively.
Otherwise, the electrical characteristic may not
satisfy specifications
-1-
Ver.5.2
1 page  
www.DataSheet4U.com
Where C2 is 0.15uF:
TON
=
0.15
×10
−6
×
2.8 − 0.8
0.6 ×10−6
= 0.49[sec]
NJU7343/44/45
Auto Resume Time (Toff) is given by:
TOFF
=
C2 VCL − VID
Idis
[sec]
Where C2 is 0.15uF:
TOFF
=
0.15
×
10
−6
×
2.8 − 0.8
0.1× 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
Ct Terminal voltage
VCL
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:
R1+ R2 + Rin
=
VDD
Ihbias
=
5
5 ×10 −3
= 1.0kΩ
R1 = R2 = 300Ω
-5-
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet NJU7344.PDF ] | |
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