Ordering number : ENA2023 LB11861MC Monolithic Digital IC Single-Phase Full-Wave Fan Motor Driver http://onsemi.com Overview The LB11861MC is a single-phase bipolar drive motor driver that easily implements direct PWM motor drive systems with excellent efficiency. The LB11861MC is optimal for fan motor drive in personal computer power supply systems and CPU cooling fan systems. Features • Single-phase full-wave drive (16V, 1.2A transistors are built in) • External PWM control pin incorporated (f=16k to 50kHz) External PWM signal DUTY control to enable speed control to stop, medium speed, and full speed Slow-Decay regeneration to enable low power consumption and high-efficiency rotation control • Soft switching circuit incorporated Soft-SW circuit achieving small loss, low noise, and low vibration at a time of phase shift •Built-in regenerative diode (Di); only requires a minimal number of external components. • Built-in lock protection and automatic recovery circuits • FG (speed detection) outputs incorporated • Built-in thermal shutdown circuit. Semiconductor Components Industries, LLC, 2013 May, 2013 31412 SY 20120127-S00003 No.A2023-1/5 LB11861MC Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit VCC maximum output voltage VCC max 18 V OUT pin maximum output current IOUT max 1.2 A 18 V OUT pin output voltage PWM-IN input pin voltage VOUT max VPWM-IN max FG output pin output voltage VFG max FG output current IFG max Allowable power dissipation Pd max When mounted on a circuit board *1 VCC V 18 V 10 mA 0.8 W Operating temperature Topr -30 to +90 °C Storage temperature Tstg -55 to +150 °C *1 Specified circuit board : 114.3 × 76.1 × glass epoxy. Caution 1) Absolute maximum ratings represent the value which cannot be exceeded for any length of time. Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current, high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details. 1.6mm3, 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. Recommended Operating Conditions at Ta = 25°C Parameter VCC supply voltage Symbol Conditions Ratings VCC Unit 4.5 to 16 V VPWM-IN input H voltage range VPWM-IN-H 2.5 to VCC V VPWM-IN input L voltage range VPWM-IN-L 0 to 1 V Hall sensor input common-mode VICM 0.2 to 3 V input voltage range Electrical Characteristics Unless otherwise specified Ta = 25°C, VCC = 12V Parameter Symbol Ratings Conditions min typ 15 Unit max Circuit current ICC1 Drive mode 24.5 29 mA ICC2 Lock protection mode 6 CT pin high-level voltage VCTH 3.45 11 16 μA 3.6 3.75 CT pin low-level voltage VCTL 1.4 1.55 V 1.7 V ICT charge current ICT1 1.7 2.2 2.8 μA ICT discharge current ICT2 0.17 0.22 0.28 μA ICT charge/discharge current ratio RCT 8 10 11.5 OUT output low saturation voltage VOL IO = 200mA 0.2 0.3 V OUT output high saturation voltage VOH IO = 200mA 0.9 1.1 V Hall sensor input sensitivity VHN Zero peak value (including offset and 10 20 mV -10 μA 0.3 V 30 μA 180 °C hysteresis) PWM-IN input current IPIN PWM-IN=0V RD/FG output pin low-level voltage VRDL/FGL IRD/FG = 5mA RD/FG output pin leakage current IRDL/FGL VRD/FG = 7V Heat protection circuit THD (*2) Design target 0.2 (*2) The standard is a design target value and measurement with the single piece has not been made. No.A2023-2/5 LB11861MC Package Dimensions unit : mm (typ) 3420 Pd max — Ta Allowable power dissipation, Pd max —W 1.0 5.0 0.5 4.4 6.2 10 1 0.15 0.35 0.05 (1.5) 1.55 0.8 MAX 2 1.0 Specified circuit board : 114.3× 76.1× 1.6mm3 glass epoxy board 0.8 0.6 0.4 0.38 0.2 0 10 30 50 70 90 110 Ambient temperature, Ta — C SANYO : MFP10SK(225mil) Truth Table PWM-IN High Low IN- IN+ High Low Low High High Low Low High - High Low - Low High CT Low High OUT1 OUT2 FG High Low Low Low High Off Off Low Low Low Off Off High Off Low Off High Off Mode During rotation − drive During rotation − regeneration Lock protection Pin Assignment MFP-10SK(TOP VIEW) PGND OUT1 OUT2 SGND VCC LB11861MC PWM-IN FG CT ININ+ VCC: Common power supply for motor and control systems PGND: Motor system GND SGND: Control system GND No.A2023-3/5 LB11861MC Block Diagram FG Thermal protection circuit VCC Delay circuit constant voltage control circuit OUT2 HALL IN+ Delay circuit IN- M Amplifier with hysteresis charge/discharge circuit SGND CT OUT1 PGND PWM-IN Application Circuit Example *2 VCC FG H IN*4 PWM control signal *5 OUT1 IN+ f=16K to 50KHz OUT2 PWM-IN *3 PGND *1 CT CT=0.47 to 1uF SGND *1. Power supply and ground lines P-GND is connected to the motor power supply system and S-GND is connected to the control circuit power supply system. These two systems should be formed from separate lines and the control system external components should be connected to S-GND. *2. Regeneration power supply stabilization capacitor The capacitor CM provides power supply stabilization for both PWM drive and kickback absorption. A capacitor with a value of over 1 to 10µF is used for CM. Insert the zenor diode for kickback protection between VCC and GND. Since this IC adopts a technique in which switching is performed by the high side transistor and regeneration is handled by the low side transistor, the pattern connecting CM to VM and P-GND must be as wide and as short as possible. *3. PWM-IN pin This is for speed control with the external PWM signal. With driving at the input of “H” and regeneration (Slow-Decay) at the input of “L”, high efficiency rotation control can be made. RP=10kΩ is the current limiting resistor for protection. Though the input signal frequency range is 0 to 50 kHz, 16 k to 50 kHz is recommended. Rotation can be stopped by inputting “L”. No.A2023-4/5 LB11861MC *4. Hall sensor input Lines that are as short as possible must be used to prevent noise from entering the system. The Hall sensor input circuit consists of a comparator with hysteresis (20mV). We recommend that the Hall sensor input level be at least three times this hysteresis, i.e. at least 60mVp-p. *5. FG output This is an open collector output, and a rotation count detection function can be implemented using this FG output, which corresponds to the phase switching. This pin must be left open if unused. ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. 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