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1 / 14 page 32207 MS IM 20070301-S00003 / D0606 MH IM 20060619-S00002 No.A0609-1/15 http://onsemi.com Semiconductor Components Industries, LLC, 2013 May, 2013 LB11850VA Overview The LB11850VA is a single-phase bipolar fan motor driver with speed control function that works with a speed feedback signal. A highly efficient, quiet and low power consumption motor driver circuit, with a high speed accuracy and large variable speed can be implemented by adding a small number of external components. This pre-driver is optimal for driving large scale fan motors (with large air volume and large current) such as those used in servers and consumer products. Functions and features • Pre-driver for single-phase full-wave drive →PMOS-NMOS is used as an external power TR, enabling high-efficiency and low-power-consumption drive by means of the low-saturation output and single-phase full-wave drive. • On-chip speed control circuit →The speed control (closed loop control) using a speed feedback signal makes it possible to achieve higher speed accuracy and lower speed fluctuations when supply voltage fluctuates or load fluctuates, compared with an open-loop control system. Separately excited upper direct PWM control method is used as the variable-speed control system. • External PWM input or analog voltage input enabling variable speed control →The speed control input signal is compatible with PWM duty ratio or analog voltages. • On-chip soft start circuit • Lowest speed setting pin →The lowest speed can be set with the external resistor. • Current limiter circuit incorporated →Chopper type current limit at start or lock. • Reactive current cut circuit incorporated →Reactive current before phase change is cut to enable silent and low-consumption drive. • Constraint protection and automatic reset functions incorporated • FG (speed detection), RD (lock detection) output • Constant-voltage output pin for hall bias Ordering number : ENA0609A Monolithic Digital IC For Fan Motor Single-Phase Full-Wave Pre-Driver with Speed Control Function |
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