O1012NK 20120913-S00011 No.A2133-1/12

http://onsemi.com

Semiconductor Components Industries, LLC, 2013

May, 2013

LB11852RV

Overview

The LB11852RV is a single-phase bipolar driving motor pre-driver with a speed control function based on speed

feedback. With a small number of external parts, a highly efficient and very quiet variable-speed drive fan motor with

low power consumption and high rotational accuracy can be implemented. The LB11852RV, integrated in a miniature

package, is best suited for driving small fan motors requiring speed control.

Features

• Single-phase full-wave driving pre-driver

⇒ With a PMOS-NMOS device used as the external power transistor, low saturation output and a single-phase

full-wave drive enable a high-efficiency drive with low power consumption.

• Speed control circuit incorporated

⇒ Compared with open-loop control, a closed-loop control function that uses speed feedback to control the speed

makes it possible to improve the rotational speed accuracy and reduce the variations in the rotational speed

caused by fluctuations in the supply voltage or load. The separately excited upper direct PWM method is

featured as the variable speed system.

• Variable speed control is possible with external PWM input or analog voltage input

⇒ The speed control input signal is compatible with PWM duty ratio and analog voltages.

• Soft start circuit incorporated

• Minimum speed setting pin

⇒ The minimum speed can be set using an external resistor.

• Current limiting circuit incorporated

⇒ Chopper type current limit at startup or lock.

• Reactive current cut circuit incorporated

⇒ Reactive current before phase changeover is cut, ensuring highly silent and low power-consumption drive.

• Automatic resetting type constraint circuit incorporated

• RD (lock detection) output

Monolithic Digital IC

For Fan Motor

Single-phase Full-wave Pre-driver

with Speed Control Function

Ordering number : ENA2133