Ordering number : EN7192B LA6581T Monolithic Linear IC Fan Motor Driver http://onsemi.com BTL Driver Single-Phase Full-Wave Overview The LA6581T is a low-saturation BTL output linear driving motor driver for single-phase bipolar fan motors. It features quite, low power, high efficiency drive that suppresses reactive current. It is optimal for use in applications that require miniaturization and low noise, such as CPU cooling fan motors and 5 to 12V electronic game products. Functions • Single-phase full-wave linear drive with BTL output (gain resistance 500Ω to 284kΩ, 55dB) : Suitable for the equipment requiring silent operation, such as game equipment, CPU cooler, etc. because of its freedom from switching noise. • Low-voltage operation possible, with wide operable voltage range (3 to 16V) • Low saturation output (Upper + lower saturation voltage : VOsat (total) = 0.3V typ, IO = 100mA) : High coil efficiency with low current drain. IC itself does not generate much heat. • High impedance of Hall input pin • FG output (rotation speed detection output : open collector output) • Heat protection circuit : When the large current flows because of output short-circuit, raising the IC chip temperature above 180°C, the heat protection circuit suppresses the drive current, preventing IC burn and breakdown. • Ultraminiature package (MSOP8: 3.0mm×4.9mm×0.93mm typ) : Small substrate while allowing larger blades. Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit Supply voltage VCC max 18 V Output current IOUT max 0.30 A Output withstand voltage VOUT max 18 V FG output withstand VFG max 18 V FG output current IFG max 5 mA Allowable power dissipation Pd max 400 mW Operating temperature Topr -20 to +90 °C Storage temperature Tstg -55 to +150 °C * Specified board: 20.0mm × 10.1mm × 0.8mm, Paper phenol, wiring density 20%. Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Semiconductor Components Industries, LLC, 2013 May, 2013 30409 MS / 60607 MS IM B8-5218 / N2502AS (OT) No.7192-1/4 LA6581T Recommended Operating Ratings at Ta = 25°C Parameter Symbol Supply voltage VCC Common-phase input voltage range VICM Conditions Ratings Unit 2.5 to 16 V 0.3 to VCC-1.5 V of Hall input Electrical Characteristics at Ta = 25°C, VCC = 12.0V, unless especially specified. Parameter Symbol Ratings Conditions min Unit typ max IN- = 5.8V, IN+ = 6.0V, RL = ∞ 14 19 mA VOL IO = 100mA 0.1 0.2 V VOH IO = 100mA 0.1 0.2 V Hall bias voltage VHB RH = 360Ω+91Ω 1.85 1.95 2.05 V Hall amplifier gain Vg 52 55 58 dB Hall amplifier input current VINR -10 -2 10 μA FG output low voltage VFG IFG = 3mA 0.2 0.3 V FG output leakage current IFGL VFG = 7V 30 μA Thermal protection circuit Th * Design guarantee 180 200 °C Circuit current ICC OUT output low voltage OUT output high voltage 150 * Design guarantee : Design target. Measurement with a single unit not made. Package Dimensions unit : mm (typ) 3245B Pd max - Ta Allowable power dissipation, Pd max - mW 500 3.0 0.5 3.0 4.9 8 1 (0.53) 2 0.65 1.1MAX 0.125 300 200 192 100 Mounted on a board: 20×10×0.8mm3, paper phenol 0 --20 0 20 40 60 80 90 100 Ambient temperature, Ta - °C 0.08 (0.85) 0.25 Specified board 400 SANYO : MSOP8(150mil) Truth Table IN- IN+ OUT1 H L H L L L H L H off − − off off − OUT2 FG Mode During rotation During overheat protection No.7192-2/4 LA6581T Pin Assignment IN+ 1 8 FG 7 VCC HB 2 LA6581T IN− 3 6 OUT2 OUT1 4 5 GND Top view Block Diagram VCC FG 2.0VRG HB IN+ H OUT1 OUT2 IN- GND Timing Chart Hall Signal OUTPUT Coil Current FG Pulse No.7192-3/4 LA6581T Application Circuit Example Di Cr *4 VCC *1 R2 *3 LA6581T *2 H HB FG HB IN− OUT1 IN+ OUT2 H IN− IN+ *5 R2 GND R1 Elements in substrate *1 : When Di to prevent breakdown in case of reverse connection is used, it is necessary to insert a capacitor Cr to secure the regenerative current route. Similarly, Cr is necessary to enhance the reliability when there is no capacitor near the fan power line. *2 : To obtain Hall bias from VCC, carry out 1/2 × VCC bias as shown in the figure. Linear driving is made through voltage control of the coil by amplifying the Hall output. When the Hall element output is large, the startup performance and efficiency are improved. Adjustment of the Hall element can reduce the noise further. *3 : When the Hall bias is taken from the HB pin, constant-voltage bias is made with about 2.0V. Therefore, the Hall element can provide the output satisfactory in temperature characteristics. Adjustment of the Hall output amplitude is made with R1. (When VCC = 12V, the step *2 above proves advantageous for IC heat generation.) *4 : Keep this open when not used. *5 : When the wiring from the Hall output to IC Hall input is long, noise may be carried through the wiring. 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