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| NJU7329A Single-phase DC Brushless Motor Driver IC s GENERAL DESCRIPTION s 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 s 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 s BLOCK DIAGLAM s PIN FUNCTION 1: NC 2: OUT A 3: IN4: IN+ 5: GND 6: NC 7: Ct 8: FG 9: OUT B 10: VDD 1 TSD 10 2 9 RF 3 RF 8 4 Lock Detect 7 5 6 Ver.2003-07-28 -1- NJU7329A s ABSOLUTE MAXIMUM RATINGS PARAMETER RATINGS SYMBOL (unit) VDD (V) VID(V) IO PEAK (mA) Topr (C) Tstg (C) PD (mW) (Ta=25C) NOTE 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 s RECOMMENDED OPERATING CONDITIONS VDD=2.4V5.5V s ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL CONDITION Operating Current Input Offset Voltage Input Common Mode Voltage Range Maximum Output Voltage Range Lock Protect Operating Voltage Lock Detect Charge Current Lock Detect Discharge Current Clamp Voltage Detect Voltage Thermal Shutdown Temperature Feedback Resistance FG H Leak Current FG L Voltage IDD VIO VICM VOM Io= -350mA VLOP ICHG IDCHG VCL VID TTSD RF IFG-LEAK VFG 4pin=0V, 3pin=5V Io=+350mA Device itself MIN. -15 0.44.0 4.55 4.0 22.0 - TYP. 3.0 4.65 0.35 1.5 0.5 2.6 0.6 180 27.5 - (VDD =5V, Ta=25C) MAX. UNIT 4.0 15 V 0.45 33.0 1.0 0.3 V A A V V C k A V mA mV V 4pin=5V, 3pin=0V, R3=10k -2- Ver.2003-07-28 NJU7329A sTIMING CHART IN+ IN- OUTA OUTB Ct FG Ver.2003-07-28 -3- NJU7329A s TYPICAL CHARACTERISTICS VDD-IDD IN-=VDD, IN+=0V, Ct=0V, VSS=0V 4.0 3.5 3.0 VDD-VOM(BTL)[AMPA=H] Iout=350mA, IN-=0V, IN+=VDD/2, Ct=0V, VSS=0V 10.0 9.0 8.0 7.0 2.5 IDD[mA] VOM[V] 6.0 5.0 4.0 3.0 2.0 1.5 1.0 2.0 0.5 0.0 0 1 2 3 4 5 6 7 8 1.0 0.0 0 1 2 3 4 5 6 7 8 VDD[V] VDD-VOM(BTL)[AMPB=L] Iout=350mA, IN-=0V, IN+=VDD/2, Ct=0V, VSS=0V 1.0 0.9 0.8 0.7 4.0 3.7 3.4 3.1 VDD[V] VDD-VCL IN-=VDD/2, IN+=0V, VSS=0V, Ct=LH VOM[V] VCL{V] 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 1 2 3 4 5 6 7 8 2.8 2.5 2.2 1.9 1.6 1.3 1.0 2 2.5 3 3.5 4 4.5 5 5.5 6 VDD[V] VDD-IDCHG IN-=VDD, IN+=0V, VSS=0V 0.50 0.45 0.40 0.35 1.0 0.9 0.8 0.7 VDD[V] VDD-VID IN-=VDD, IN+=0V, VSS=0V, Ct=HL IDCHG[A] 0.25 0.20 0.15 0.10 0.05 0.00 2 2.5 3 3.5 4 4.5 5 5.5 6 VID[V] 0.30 0.6 0.5 0.4 0.3 0.2 0.1 0.0 2 2.5 3 3.5 4 4.5 5 5.5 6 VDD[V] VDD[V] -4- Ver.2003-07-28 NJU7329A s TYPICAL CHARACTERISTICS VDD-ICHG IN-=VDD, IN+=0V, VSS=0V 1.5 1.3 1.1 ICHG[A] 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 4.85 VOM[V] 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 0.35 VOM[V] 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 -5- NJU7329A s TYPICAL CHARACTERISTICS IFG-VFG VDD=5V, VSS=0V, IN-=VDD/2, IN+=0V, Ct=0V 1600 1400 1200 VFG(mV) 1000 800 600 400 200 0 0 2 4 6 IFG(mA) 8 10 12 s 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 GND R3 R1 VDD Hall element IN+ INR2 Ct C2 VSS FG FG out OUTB OUTA Motor C1 NJU7329A -6- 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 x 10 - 6 x 2 .6 - 0 . 6 = 0.62[sec ] 1.5 x 10 - 6 Auto Resume Time (Toff) is given by: TOFF = C 2 VCL - VID [sec] IDCHG Where C2 is 0.47uF: TOFF = 0.47 x 10 - 6 x 2.6 - 0.6 = 1.88[sec ] 0.5 x 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. Ver.2003-07-28 -7- 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 VDD 5 = = 1k Ihbias 5 x 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 10k. The timing chart of FG Out is as follows. Hall input IN+ FG Terminal voltage -8- Ver.2003-07-28 NJU7329A s OUTPUT VOLTAGE vs OUTPUT CURRENT CHARASTERISTICS NJU7329 Upper Output Voltage vs. Output Current 0.5 VDD=5V Ta=25degC 0.4 O UT PUT VOLTAGE [V] 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 0.4 O UTPUT VOLTAGE [V] 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- |
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