NJU7357 New Japan Radio Co.,Ltd, NJU7357 Datasheet
NJU7357
Related parts for NJU7357
NJU7357 Summary of contents
Page 1
... Single-phase DC Brushless Motor Driver IC GENERAL DESCRIPTION The NJU7357 is single-phase DC brushless motor driver IC. And It features MOS-FET driver circuit for better output characteristics. NJU7357 features Lock Detect (Ct less type), Frequency Generator Output, Thermal Shutdown Circuit and PWM_IN INPUT for Rotation Speed Control. Maximum output current is 1000mA and Continuance output current is 400mA suitable for variable speed FAN required Low Noise & ...
Page 2
... NJU7357 ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Input Voltage Output Current (Peak) Operating Temperature Range Storage Temperature Range Power Dissipation Junction Temperature ( 1). Input voltage is not to be over supply voltage to really use 2). This value is not to be over Pd. * RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL ...
Page 3
... ON/OFF Ratio RATIO PWM Input PWM Input F Frequency Ratio PWM PWM pull-up R Resistance PWM Input H Level Voltage V IHP Input L Level Voltage V ILP CONDITION - - - - - - - Io=+400mA Io= -400mA Io=+400mA Io=-400mA IN+=5V, IN-=0V, R =10k L IN+=0V, IN-=5V, R =10k NJU7357 (V =5V, Ta=25°C) DD MIN. TYP. MAX. UNIT - 2.0 5.0 - 180 - - 0.4 - 4.0 4.65 4. 0.20 0. ...
Page 4
... NJU7357 INPUT-OUTPUT TRUTH TABLE IN PWM PWM TIMING CHART IN+ IN- PW M_IN OUTA OUTB FG FG TIMING CHART Motor locked IN+ IN- PW M_IN OUTA OUTB OUTA OUTB (Output Transistor (Output Transistor OFF ) (Output Transistor ON ) ...
Page 5
... TYPICAL CHARACTERISTICS VDD-IDD IN+=VDD, IN-=GND MEAS:IDD VDD ( AMBIENT TEMPERATURE [D C] 2000 1800 1600 1400 1200 1000 800 600 400 200 NJU7357 125 150 100 IFG-VFG VDD=5V, IN+=2.5V, IN-=GND MEAS: IFG (mA ...
Page 6
... NJU7357 TYPICAL CHARACTERISTICS VDD-VOH VDD=5V, IN+=2.5V, IN-=GND MEAS:OUTA (Io=400mA) 500 450 400 350 300 250 200 150 100 VDD (V) Io-VOH VDD=5V, IN+=2.5V, IN-=GND MEAS:OUTA 1000 900 800 700 600 500 400 300 200 100 0 0 500 1000 Io (mA) VDD-LOCKon_time IN+=Vdd/2, IN-=GND MEAS:OUTA 0 ...
Page 7
... APPLICATION NOTE The NJU7357 are single-phase DC brushless motor driver IC in small TVSP8 package. With minimal external components, that can drive up to 500mA of motor current for small fan application. [Application Circuit Example GND R1 Hall element R2 [Design Notes] Above application example is designed for 5V operation with motor current of 500mA. It uses the following ...
Page 8
... NJU7357 The output voltage of hall elements is influenced by the bias current and magnetic flux density of hall elements. The optimum input voltage of NJU7357 are 100mVp-p and higher. With such input voltage, the highest efficiency can be obtained. 4. Design of FG output resistance (R FG Out (FG: Pin5 open drain output and R The timing chart of FG Out is as follows ...