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| NJU7342 www..com Single-phase DC Brushless Motor Driver IC I GENERAL DESCRIPTION I PACKAGE OUTLINE The NJU7342 is a single-phase DC brushless motor driver IC for small fan-motor 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. It is suitable for small fan-motor applications. I FEATURES * Operating Voltage VDD=2.4 5.5V * Low Operating Current * Low Saturation Output Voltage Vsat=0.35V @Io=250mA * C-MOS Technology * Package Outline VSP8/TVSP8 NJU7342R/RB1 I BLOCK DIAGLAM I PIN FUNCTION 1 RF RF 8 A -+ B +- 2 3 4 7 6 5 1: AOUT 2: AMP-IN 3: AMP+IN 4: GND 5: NC 6: NC 7: BOUT 8: VDD GND -1- NJU7342 www..com I ABUSOLUTE MAXIMUM RATINGS PARAMETER RATINGS Supply Voltage Input Voltage Operating Temperature Range Storage Temperature Range Power Dissipation +7 -0.3 VDD+0.3 -40 +85 -50 +150 400 SYMBOL (unit) VDD (V) VID(V) Topr (C) Tstg (C) PD (mW) (Ta=25C) NOTE Device itself I RECOMMENDED OPERATING CONDITIONS VDD=2.4V5.5V I ELECTRICAL CHARACTERISTICS PARAMETER Input Offset Voltage Input Common Mode Voltage Range Maximum Output Voltage Range Operating Current Feedback Resistance SYSMBOL VIO VICM VOM+ VOM IDD RF CONDITION Io=+250mA Io= -250mA MIN. -5 0.44.0 4.55 22.0 4.65 0.35 3.0 27.5 (Ta=25C, VDD=5V) TYP. MAX. 5 0.45 4.0 33.0 UNIT mV V V V mA k (Note) The oscillation comes to happen easily in the state that there is no load of current and gain is low. In this case, please adjust the stray capacity of the output terminal to 100pF or less. -7- NJU7342 www..com I APPLICATION CIRCUIT VDD 1 RF HALL BIAS RESISTOR 8 RF 2 3 4 A -+ B +- 7 6 5 Di Di HALL SENSOR N S S MOTOR STATER N MOTOR AMATEUR Di Di Diodes shown in the picture indicate external re-circulating diodes. Place re-circulaing diodes at output terminal depending on the inductive load. 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. -3- |
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