EUM6858R/S-12V 三相无传感器型风扇驱动芯片  DataSheet
概述
EUM6858R/S是三相Sensorless风扇马达驱动芯片，通过PWM输入信号控制风扇转速。其内置PWM控速模式、软切换、锁定保护、过压保护、转速反馈输出，欠压保护、正反转控制功能。通过有限的外围元件尽可能满足马达小型化需求。
EUM686858R/S通过改变PWM占空比，实现马达转速控制。内置软切换功能实现实现风扇低噪声、低抖动运转；EUM686858R/S通过外部调节OSC与VSS之间的电容容值，可优化马达启动。当外力或障碍等原因导致电机锁定不转时，过驱动电流可能会引起温度升高而损坏马达。为了防止此类现象，当马达锁死后，锁定保护电路将关断内部功率管，切断马达驱动电流。几秒钟后自动重启电路将尝试重新打开功率管恢复马达驱动，如果锁死状态依然存在，EUM686858R/S将再次关断驱动电流几秒钟。正常工作时，FG/ 1/2FG输出马达转速信号，且可通过设定FR高低电位实现马达的正反转控制。
特点
•三相无传感器型驱动(无需霍尔传感器)
•宽工作电压(3.0V~20V)
•180°正弦驱动
•风扇转速斜率外部设定
•FG/ 1/2FG输出
•外围元件少
•PWM直接输入控速
•最低转速外部设定(EUM6858R)
•停转占空比外部设定(EUM6858S)
•锁定保护与自动重启
•风扇转速反馈输出
•TSSOP-16（EP）封装
•符合RoHS规范及无铅，无卤
应用
•低噪声、低功耗散热风扇
EUM6858R/S-12V 3-Phase Sensorless Fan Motor
Description
EUM6858R/S is motor driver IC for driving a three-phase brushless DC motor without a hall sensor. It is controlled by a variable speed provided through the PWM input signal, and integrates PWM speed control, soft switching, lock protection, over-voltage protection, fan tachometer, under voltage lock out circuit and forward/reverse functions. The motor downsizing can be achieved by limiting the number of external components as much as possible.
As the application of three-phase driving method, PWM method to control the speed of the fan through the pulse width modulation signal to adjust the duty cycle. Internal soft switching function drives fan motor in low noise and low vibration ways. EUM6858R/S can drive motor from stop mode to rotation mode by adjusting the external capacitor between OSC pin and GND. If a motor is stalled by external force or obstacles, over drive current may incur coil overheat and burning. In order to prevent motor from overheating, the lock protection circuit shuts down the internal power devices for a few seconds after the motor lock is detected. Then the auto restart circuit resumes to power up the internal power devices. If the lock is still continuing, EUM6858R/S shuts down power devices for another few seconds. The lock protection time is built-in and need no external components. During rotation, FG/ 1/2FG outputs motor speed feedback signal. The motor rotation direction can be changed by setting FR to high or low.
Feature
•3-Phase Sensorless Drive (No Hall Sensor Needed)
•Wide Input Range 3.0V~20V
•180° Sinusoidal drive
•Fan Speed Slope Control
•FG and 1/2FG Output
•Few External Components
•Direct PWM Fan Speed Control
•Programmable Minimum Fan Speed (EUM6858R Only)
•Stop Mode PWM Duty Adjustable (EUM6858S Only)
•Lock Protection and Auto Restart
•Fan Rotation Speed Feedback Output
•Available in TSSOP-16 (EP) Package
•RoHS Compliant and 100% Lead (Pb)-Free Halogen-Free
Application
•Low Noise Fan and Low Power Consumption Fan
|