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| NJU7327 Single-phase DC Brushless Motor Driver IC I GENERAL DESCRIPTION I PACKAGE OUTLINE The NJU7327 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 NJU7327 also includes frequency generator (FG) output for various control needs. NJU7327R I FEATURES * Operating Voltage VDD=3.5 15V * FG Output * Internal Lock Detect * Low Operating Current * Low Saturation Output Voltage Vsat=0.35V @Io=200mA * C-MOS Technology * Package Outline VSP10 I BLOCK DIAGLAM I PIN FUNCTION 1: LD 2: FG 3: VSS 4: OUT B 5: VDD 6: VDD 7: OUT A 8: VSS 9: IN10: IN+ 1 LOCK DETECT 10 2 FG +- 9 3 8 4 AMP B INT AMP A 7 5 6 -1- NJU7327 I ABSOLUTE MAXIMUM RATINGS PARAMETER RATINGS SYMBOL (unit) VDD (V) VID(V) Topr (C) Tstg (C) PD (mW) (Ta=25C) NOTE Supply Voltage +18 Input Voltage -0.3 VDD+0.3 Operating Temperature Range -40 +85 Storage Temperature Range -50 +150 Power Dissipation 400 I RECOMMENDED OPERATING CONDITIONS VDD=3.5V15.0V I ELECTRICAL CHARACTERISTICS PARAMETER SYSMBOL CONDITION Operating Current Input Offset Voltage Input Common Mode Voltage Range Maximum Output Voltage Range Slew Rate Lock Detect Charge Current Lock Detect Discharge Current Clamp Voltage Detect Voltage Thermal Shutdown Temperature FG H Leak Current FG L Voltage IDD VIO VICM VOM SR ICH IDIS VCL VLD TTSD IFGLEAK VFGL No load 1V bias Io=+200mA Io= -200mA RL=58.6 - Device itself MIN. -15 0.2 11.55 46.2 0.70 0.20 2.5 0.54 - (VDD=12V, Ta=25C) TYP. MAX. UNIT 3.0 11.70 0.30 60.0 1.25 0.40 2.6 0.60 180 4.0 15 8.0 0.45 85.7 2.25 0.80 2.7 0.66 1.0 0.3 mA mVp-p V V mV/S A A V V C A V IN+=12V, IN-=0V, RP=10k IN+=0V, IN-=12V, RP=10k -2- NJU7327 I APPLICATION CIRCUIT VDD 1 LOCK DETECT C1 10 HAL 2 FG +- 9 3 8 VSS 4 AMP B INT AMP A 7 5 VDD 6 M * Connect the decoupling capacitor between VDD and VSS. -3- NJU7327 TYPICAL CHARACTERISTICS IDD - VDD No LoadLD=VSS FG:OPEN 3.5 3.0 SR - VDD 0.12 0.10 SR[V/us] OUTA=H,OUTB=L OUTA=L,OUTB=H 2.5 IDD[mA] 2.0 1.5 1.0 0.5 0.0 0 2 4 6 8 10 VDD [V] 12 14 16 18 20 0.08 0.06 0.04 0.02 0.00 0 2 4 6 8 10 12 14 16 18 20 VDD [V] Ich , Idis - VDD Vcl , Vld - VDD 3.0 2.5 Vcl , Vld[V] Vcl Vld Ich , Idis[uA] 2.0 1.5 1.0 0.5 0.0 0 2 4 6 8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0 2 4 6 8 VDD [V] VOM - Io VDD=12V Ich Idis 10 12 14 16 18 20 10 12 14 16 18 20 VDD [V] VOM - VDD Io=200mA 1.2 1.0 VOM[V] 0.8 0.6 0.4 0.2 0.0 0 2 4 6 8 Bottom Top Bottom+Top VOM[V] 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0 Bottom Top Bottom+Top 10 12 14 16 18 20 100 200 300 400 500 VDD [V] Io [mA] -4- NJU7327 I APPLICATION NOTE The NJU7327 is a single-phase DC brushless motor driver IC in small VSP-10 package. With minimal external components, it can drive up to 200mA of motor current for small fan application. [Application Circuit Example] V+ GND R3 R1 Hall element VDD IN+ INR2 LD C2 VSS FG FG out D1 C1 OUTA Motor NJU7327 OUTB [Design Notes] Above application example is designed for 12V operation with motor current of 200mA. 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 () and Auto Resume Time (Toff). -5- NJU7327 Lock detection time (Ton) is given by: TON = C 2 VCL - VID [sec] Ich Where C2 is 0.47uF: TON = 0.47 x 10 - 6 x 2.6 - 0.6 = 0.76[sec ] 1.26 x 10 - 6 Auto Resume Time (Toff) is given by: TOFF = C 2 Where C2 is 0.47uF: VCL - VID [sec] Idis TOFF = 0.47 x 10 - 6 x 2.6 - 0.6 = 2.33[sec ] 0.42 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. 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 Loxked Returns to normal operation 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. -6- NJU7327 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 = 1k VDD 12 = = 2 .4 k 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 NJU7327 is 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 is as follows. Note that the pull up resistance shall be connected to below supply voltage. Hall input IN+ FG Terminal voltage [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. -7- |
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