NJU7356 Single-phase DC Brushless Motor Driver IC ■ GENERAL DESCRIPTION ■ PACKAGE OUTLINE The NJU7356 is a single-phase DC brushless motor driver IC designed for small and high power fan-motor applications. It provides a low operating current of 2mA (typ.) and low saturation output voltage at high output current operation, which offers a high efficiency motor driving. It also has a high output NJU7356RB1 current capability of 1000mA (peak) and 400mA (continuous). ( MSOP8 (TVSP8 )) The NJU7356 has useful functions such as a FG (frequency generator) output useful for various control systems, lock detect, auto-release (c-less type), thermal shutdown and linear driving which offers low noise motor driving. The NJU7356 is available in a small and thin package of MSOP8 (TVSP8), which provides downsizing and thinning in motor applications. ■ FEATURES • Operating Voltage 2.2 to 5.5V • Low Operating Current IDD=2mA • Low Saturation Output Voltage Vsat= ±0.2V @Io=±400mA • Lock Detect / Auto Release Circuit • Thermal Shutdown Circuit • Frequency Generator Output • Hall Bias Terminal • CMOS Technology • Package Outline MSOP8 (TVSP8)* *MEET JEDEC MO-187-DA / THIN TYPE ■ BLOCK DIAGRAM ■ PIN FUNCTION 1 8 LD 2 TSD 7 Control 6 3 4 1: OUT B 2: IN + 3: HB 4: IN 5: FG 6: VDD 7: OUT A 8: VSS 5 Hall Bias -1Ver.1.0 NJU7356 ■ ABSOLUTE MAXIMUM RATINGS PARAMETER RATINGS Supply Voltage +7.0 Input Voltage -0.3 to VDD Output Current (Continuance) 400 Output Current (Peak) 1000 Operating Temperature Range -40 to +85 Storage Temperature Range -50 to +150 Power Dissipation 400 Junction Temperature 150 Note1 : This value is not to be over Pd. Note2 : Input voltage is not to be over supply voltage to really use. ■ RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL CONDITION Supply Voltage VDD Ct=0 -2- (Ta=25°C) NOTE SYMBOL (unit) VDD (V) VID(V) IO (mA) IO PEAK (mA) Topr (°C) Tstg (°C) PD (mW) Tjmax(°C) MIN. 2.2 Note1 Note2 Device itself TYP. 5.0 (Ta=25°C) MAX. UNIT 5.5 V NJU7356 ■ ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL (VDD =5V, Ta=25°C) TYP. MAX. UNIT CONDITION MIN. IDD - - 2.0 5.0 mA TTSD - - 180 - °C THYS - - 50 - °C Input Offset Voltage VIO - -10 - 10 mV Feedback Resistance RF - - 27.5 - kΩ Open Loop Gain AV - - 70 - dB Input Common Mode Voltage Range VICM - 0.4 - 4.0 V VOH Io=+400mA 4.65 4.80 - VOL Io=-400mA - 0.20 0.35 RONH Io=+400mA - 0.5 - RONL Io=-400mA - 0.5 - FG L Output Voltage VFG IN+=5V, IN-=0V, RL=10kΩ - - 0.3 V FG H Leak Current IFG-LEAK IN+=0V, IN-=5V, FG=5V - - 1.0 µA TON - - 0.5 - sec TOFF - - 3.5 - sec TRATIO - - 1:7 - - VHB - 1.1 1.3 1.5 V General Operating Current Thermal Shutdown Temperature Thermal Shutdown Hysteresis Hall Amplifier Output Maximum Output Voltage Range Output Resistance Lock Detect Circuit* Lock Protect ON Time Lock Protect OFF Time Detect Protection ON/OFF Ratio V Ω Hall Bias Hall Bias Voltage -3- NJU7356 ■ INPUT-OUTPUT TRUTH TABLE IN+ IN - OUTA OUTB FG H L L H H L L H L (Output Transistor ON ) Z (Output Transistor OFF ) ■ TIMING CHART Motor locked Lock release IN+ INOUTA OUTB FG Toff Ton Toff Motor lock protection period ■ POWER DISSIPATION 400 350 POWER DISSIPATION [mW] 300 250 200 150 100 50 0 25 50 AMBIENT [D ■ TYPICAL CHARACTERISTICS -4- C] 75 85 100 TEMPERATURE 125 150 NJU7356 VDD-Idd IN+=VDD, IN-=GND VDD-Vhb VDD=5V, IN+=2.5V, IN-=GND (Io=5mA) 1.28 2.5 1.27 2.0 1.5 Vhb (V) Idd (mA) 1.26 1.0 1.25 1.24 1.23 0.5 1.22 0.0 1.21 0 1 2 3 4 5 6 7 8 0 1 2 3 VDD (V) 4 5 6 7 8 VDD (V) VDD-Voh VDD=5V, IN+=2.5V, IN-=GND (Io=400mA) VDD-Vol VDD=5V, IN-=2.5V, IN+=GND (Io=400mA) 600 180 160 500 140 120 Vol (mV) Voh (mV) 400 300 100 80 60 200 40 100 20 0 0 0 1 2 3 4 5 6 7 0 8 1 2 3 4 5 6 7 8 VDD (V) VDD (V) Io-Voh VDD=5V, IN+=2.5V, IN-=GND (Io=400mA) Io-Vol VDD=5V, IN-=2.5V, IN+=GND (Io=400mA) 600 450 400 500 350 300 Vol (mV) Voh (mV) 400 300 200 250 200 150 100 100 50 0 0 0 200 400 600 Io (mA) 800 1000 0 200 400 600 800 1000 Io (mA) ■ TYPICAL CHARACTERISTICS -5- NJU7356 VDD-LOCKon_time IN+=VDD/2, IN-=GND VDD-LOCKoff_time IN+=VDD/2, IN-=GND 4.5 0.7 4.0 0.6 3.5 0.5 Toff (s) Ton (s) 3.0 0.4 0.3 2.5 2.0 1.5 0.2 1.0 0.1 0.5 0.0 0.0 0 1 2 3 4 5 6 7 8 0 1 2 3 4 5 VDD (V) VDD(V) ■ APPLICATION NOTE The NJU7356 is a single-phase DC brushless motor driver IC in small MSOP8 (TVSP8) package. With minimal external components, that can drive up to 400mA of motor current for small fan application. [Application Circuit Example] 1) Hall Bias unused application circuit V+ D1 C1 GND RL R1 VDD Hall element OUTA IN+ Motor INR2 OUTB NJU7356 FG 2) Hall bias used application circuit -6- FG 6 7 8 NJU7356 V+ D1 C1 GND RL HB Hall element VDD OUTA IN+ Motor INR3 NJU7356 OUTB FG FG [Design Notes] Above application example is designed for 5V operation with motor current of 400mA. 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. Position Detection Circuit Hall Device 2-1. When using VDD (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 = 5 VDD = = 1 . 0 kΩ Ihbias 5 × 10 −3 R1 = R 2 = 300 Ω The output voltage of hall elements is influenced by the bias current and magnetic flux density of hall elements. The optimum input voltage of NJU7356 is 100mVp-p and higher. With such input voltage, the highest efficiency can be obtained. -7- NJU7356 2-2. When using HB (R3 design) By connecting a Hall device to the Hall bias terminal (HB), a constant Hall output amplitude that has good temperature characteristics is obtained, resulting in stable linear drive. If it is necessary to adjust the Hall output amplitude, perform adjustment with R3. 3. Design of FG output resistance (RL) FG Out (FG: Pin5) is an open drain output and RL is a pull up register. A typical value of RL is 10kΩ. 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 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. -8-