LB11850VA屬于集成電路（IC）的電機驅(qū)動器控制器。由安森美半導(dǎo)體公司制造生產(chǎn)的LB11850VA電機驅(qū)動器，控制器產(chǎn)品屬于電機驅(qū)動器和控制器電源管理集成電路 (PMIC) 系列，可用于控制或操作從某電源施加到電機或相關(guān)機電執(zhí)行器的電源。所實現(xiàn)的具體功能和特性集根據(jù)預(yù)期負載和預(yù)期應(yīng)用的特性有很大差異，范圍從用于有刷電機的簡單開環(huán)速度控制到基于步進電機的高級閉環(huán)運動控制。

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