Overview

The LB1868M is a 2-phase unipolar brushless motor driver. With only a few peripheral parts, lockup protection and automatic recovery can be implemented. The IC can be configured for 12V or 24V operation and a wide range of variations, from Low speed to H-High speed and from 60cm to 120cm square using the same PCB. This makes it easy to design highly reliable fan motor installations.

Features

● Output protection Zener diode with variable withstand voltage

Z1, Z2 pins open: VOLM = 57V (24V specification)

Z1, Z2 pins shorted: VOLM = 32V (12V specification)

External Zener diode connected across Z1 - VCC pins:

support for fans with large drive current

● External resistor allows configuration for 12V or 24V

● Direct Hall element connection possible (built-in Hall amplifier

with hysteresis supports core without auxiliary electrode)

● Built-in output transistor with 1.0A output current

(strengthened negative-current support for core without auxiliary

electrode)

● Built-in rotation detection function: Low during rotation and High during stop

● Built-in lockup protection with automatic recovery

● ST pin for motor stop/drive (for standby mode of copiers etc.)

● FG output pin for rotation detection

● BC pin for kickback noise reduction (with 2 external capacitors)

● Built-in thermal shutdown

LB1868M屬于集成電路（IC） > 全半橋驅(qū)動(dòng)器。安森美半導(dǎo)體公司制造生產(chǎn)的LB1868M全半橋驅(qū)動(dòng)器器件屬于電橋驅(qū)動(dòng)器電源管理集成電路 (PMIC) 系列，包含兩個(gè)或多個(gè)功率晶體管，以及在外部器件控制下將其用作開(kāi)關(guān)所需的電路。這些晶體管通常在內(nèi)部配置為成對(duì)串聯(lián)連接（稱(chēng)為半橋），因而任意指定晶體管對(duì)之間的結(jié)點(diǎn)都可以連接至兩個(gè)電源軌中的任一個(gè)。這類(lèi)器件常用于將控制器件（如微控制器）提供的低電平信號(hào)轉(zhuǎn)換為操作執(zhí)行器（如步進(jìn)電機(jī)或無(wú)刷電機(jī)）所需的較大功率信號(hào)。