NJU7343 Single-phase DC Brushless Motor Driver IC ■ GENERAL DESCRIPTION ■ PACKAGE OUTLINE The NJU7343 is single-phase DC brushless motor driver IC designed for a small fan motor. Adopting the CMOS process, it can provide a low saturation output voltage that is effective in high current operation. It has Lock Detect / Auto Reset and Thermal Shutdown NJU7343R Circuit for safety fan operation, and it has FG output ( MSOP10 (VSP10) ) function as useful function. It is available in a small MSOP10 (VSP10) package, which makes motors thin and small. It is suitable for small and high output fan motor applications. ■ FEATURES • Operating Voltage 2.2 to 5.5V • Lock Detect / Auto Release • FG Output • Thermal Shutdown Circuit • Low Operating Current • Low Saturation Output Voltage • Vsat= ±0.25V @Io=±500mA • Input offset voltage ±5mV • CMOS Technology • Package Outline MSOP10 (VSP10)* *MEET JEDEC MO-187-DA ■ BLOCK DIAGRAM ■ PIN FUNCTION 1 10 LD 2 9 3 8 4 7 TSD 5 Ver.2013-09-09 6 1: Ct 2: FG 3: VDD 4: OUT B 5: Vss 6: Vss 7: OUT A 8: VDD 9: IN10: IN+ (Note) All VDD pins should be connected to the power supply and all VSS pins should be connected to the ground respectively. Otherwise, the electrical characteristics may not satisfy specifications -1- NJU7343 ■ ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Input Voltage Output Current (Peak) Operating Temperature Range Junction Temperature Range Storage Temperature Range Power Dissipation RATINGS SYMBOL (unit) +7.0 -0.3 ∼ VDD+0.3 1000 -40 ∼ +85 -40 ∼+150 -40 ∼+150 400 VDD (V) VID(V) IO PEAK (mA) Topr (°C) Toj (°C) Tstg (°C) PD (mW) ■ RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL CONDITION Supply Voltage (Ta=25°C) NOTE Device itself MIN. TYP. (VDD =5V, Ta=25°C) MAX. UNIT VDD Ct=0V 2.2 5.0 5.5 V Junction Temperature Range Input Common Mode Voltage Range Tj - -40 - 125 °C VICM - 0.4 - 4.0 V Output Current IO - - - 500 mA -2- Ver.2013-09-09 NJU7343 ■ ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL (VDD =5V, Ta=25°C) TYP. MAX. UNIT CONDITION MIN. IDD - - 3.0 4.0 mA TTSD - - 180 - °C THYS - - 50 - °C Input Offset Voltage VIO - -5 - 5 mV Feedback Resistance RF - 22.0 27.5 33.0 kΩ Open Loop Gain AV - - 80 - dB Input Common Mode Voltage Range VICM - 0.4 to 4.0 - - V VOH Io=+350mA 4.65 4.75 - VOL Io=-350mA - 0.25 0.35 RONH Io=+500mA - 0.5 - RONL Io=-500mA - 0.5 - ICHG - - 0.6 - µA IDCHG - - 0.1 - µA Clamp Voltage VCL - - 2.8 - V Detect Voltage VID - - 0.8 - V FG L Output Voltage VFG IN+(10pin)=0V,IN-(9pin)=5V, RP=10kΩ − − 0.3 V FG H Leak Current IFG-LEAK IN+(10pin)=5V,IN-(9pin)=0V, RP=10kΩ − − 1.0 μA General Operating Current Thermal Shutdown Temperature Thermal Shutdown Hysteresis Hall Amplifier Motor Output Maximum Output Voltage Range Output Resistance Lock Detect Circuit Lock Detect Charge Current Lock Detect Discharge Current V Ω Rotation Detect Output Ver.2013-09-09 -3- NJU7343 ■ APPLICATION NOTE The NJU7343 is single-phase DC brushless motor driver ICs in a small MSOP10 (VSP10) package. With minimal external components, that can drive up to 500mA of motor current for small fan application. [Application Circuit Example] V+ D1 C1 GND R3 R1 VDD Hall element OUTA IN+ IN- Motor R2 Ct OUTB NJU7343 C2 VSS FG [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 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 -4- VCL − VID [sec] Ich Ver.2013-09-09 NJU7343 Where C2 is 0.15uF: TON = 0.15 × 10 −6 × 2 .8 − 0 .8 = 0.49[sec ] 0.6 × 10 −6 Auto Resume Time (Toff) is given by: TOFF = C 2 VCL − VID [sec] Idis Where C2 is 0.15uF: TOFF = 0.15 × 10 −6 × 2 .8 − 0 . 8 = 3.00[sec ] 0.1 × 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 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 = 5 VDD = = 1 . 0 kΩ Ihbias 5 × 10 −3 R1 = R 2 = 300 Ω Ver.2013-09-09 -5- NJU7343 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 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: Pin2) is an open drain output and R3 is a pull up register. A typical value of R3 is 10kΩ. The timing chart is as follows. Hall input IN+ FG output [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. -6- Ver.2013-09-09