LB11967V Datasheet PDF - ON Semiconductor

●Overview

●The LB11967V is a single-phase bipolar variable speed fan motor pre-driver that works with an external PWM signal. A highly efficient, quiet and low power consumption motor driver circuit, with a large variable speed, can be implemented by adding a small number of external components.

●This device is optimal for driving large scale fan motors (withlarge air volume and large current) such as those used in

●servers and consumer products.

●Functions

●•Pre-driver for single-phase full-wave drive

●⇒ PNP-EMOS is used as an external power Transistor, enabling high-efficiency low-consumption drive by means

●of the low-saturation output and single-phase full-wave drive. (PMOS-NMOS also applicable)

●•External PWM input enabling variable speed control

●⇒ Separately-excited upper direct PWM (f = 25kHz) control method, enabling highly silent speed control

●•Compatible with 12V, 24V, and 48V power supplies

●•Current limiter circuit incorporated

●⇒ Chopper type current limit at start

●•Reactive current cut circuit incorporated

●⇒ Reactive current before phase change is cut to enable silent and low-consumption drive.

●•Minimum speed setting pin

●⇒ Minimum speed can be set with externalresistor. The start assistance circuit enables start at extremely low speed.

●•Constant-voltage output pin for Hall bias

●•Lock protection and automatic reset functions incorporated

●•(Rotation speed detection), RD (Lock detection) output