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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. NJU7343R/44R/45R It is suitable for 5V high current small fan-motor 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: Ct 2: FG(NJU7343),Half FG(NJU7344), RD(NJU7345) 3: VDD 4: OUT B 5: Vss 6: Vss 7: OUT A 8: VDD 9: IN10: IN+
(Note) All VDD and VSS pins should be connected the
power supply and the ground respectively. Otherwise, the electrical characteristic may not satisfy specifications
1
LD
10
2 3
9 8
4
TSD
7
5
6
NJU7343(FG), NJU7344(Half FG) NJU7345(RD)
-1Ver.5.2
NJU7343/44/45
s ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Input Voltage Output Current (Peak) Operating Temperature Range Storage Temperature Range Power Dissipation (Ta=25C) NOTE
RATINGS +7.0 -0.3 VDD+0.3 1000 -40 +85 -50 +150 400
SYMBOL (unit) VDD (V) VID(V) IO PEAK (mA) Topr (C) Tstg (C) PD (mW)
Device itself
s RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL CONDITION Supply Voltage Junction Temperature Range Input Common Mode Voltage Range Output Current VDD Tj VICM IO Ct=0 -
MIN. 2.2 -40 0.4 -
(VDD =5V, Ta=25C) TYP. MAX. UNIT 5.0 5.5 125 4.0 500 V C V mA
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NJU7343/44/45
s ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL General Operating Current Thermal Shutdown Temperature Thermal Shutdown Hysteresis Hall Amplifier Input Offset Voltage Feedback Resistance Open Loop Gain Input Common Mode Voltage Range Output Maximum Output Voltage Range Output Resistance FG(RD) L Output Voltage FG(RD) H Leak Current Lock Detect Circuit* Lock Protect Operation Voltage Lock Detect Charge Current Lock Detect Discharge Current Clamp Voltage Detect Voltage VOH VOL RONH RONL VFG IFG-LEAK Io=+350mA Io=-350mA Io=+500mA Io=-500mA 9pin=0V, 10pin=5V, R3=10k 9pin=5V, 10pin=0V, R3=10k 4.65 4.80 0.20 0.5 0.5 V 0.35 0.3 1.0 V A VIO RF AV VICM -5 22.0 0.44.0 27.5 80 5 33.0 mV k dB V IDD TTSD THYS 3.0 180 50 4.0 mA C C (VDD =5V, Ta=25C) MAX. UNIT
CONDITION
MIN.
TYP.
VLOP ICHG IDCHG VCL VID
-
4.0 -
0.6 0.1 2.8 0.8
-
V A A V V
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NJU7343/44/45
s 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 GND R3 R1 VDD Hall element IN+ INR2 Ct C2 OUTB OUTA Motor C1
NJU7343/44/45
VSS FG,1/2FG,RD FG,Half-FG,RD out
[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:
TON = C 2
VCL - VID [sec] Ich
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NJU7343/44/45
Where C2 is 0.15uF:
TON = 0.15 x 10 -6 x
2 .8 - 0 . 8 = 0.49[sec ] 0.6 x 10 -6
Auto Resume Time (Toff) is given by:
TOFF = C 2
VCL - VID [sec] Idis
2 .8 - 0 . 8 = 3.00[sec ] 0.1 x 10 -6
Where C2 is 0.15uF:
TOFF = 0.15 x 10 -6 x
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:
R1 + R 2 + Rin = R1 = R 2 = 300
5 VDD = = 1.0 k Ihbias 5 x 10 -3
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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: Pin8) is an open drain output and R3 is a pull up register. A typical value of R3 is 10k. The timing chart of FG Out (Half-FG,RD) is as follows. Note that the pull up resistance shall be connected to below supply voltage.
Hall input IN+
FG Terminal voltage
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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