EUM6882-具有斜率可调及低占空比辅助启动的PWM风扇马达驱动芯片  DataSheet
概述
EUM6882是一款用于无刷风扇马达驱动的芯片。它集成了三种转速控制模式、低占空比辅助启动、换相软切换、锁定保护、霍尔偏置、转速反馈、低功耗待机、快速启动以及热关断等功能。EUM6882能够驱动具有不同转速曲线要求的风扇，并且能满足笔记本电脑等便携式设备所要求的静音和低功耗特性。
EUM6882的三种转速控制模式分别是PWM模式，VCC加斜率可调模式，VCC控制模式。低占空比辅助启动确保风扇在极低占空比下仍然能顺利启动或重启。换相软切换使得风扇的换相噪声更低，抖动更小。如果马达被外部应力或者障碍物卡住，则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。EUM6882具有霍尔芯片偏置输出，转速反馈输出。同时，EUM6882具有低功耗待机和快速启动，它在待机时只有极小的功耗，并且任何时候只要取消待机，风扇均可立即启动。
特点
•单相全波驱动
•三种转速控制模式
PWM模式
VCC加斜率可调模式
VCC控制模式
•低占空比辅助启动
SD为高，开启此功能
SD为低，关闭此功能
•换相软切换
•锁定保护及自动重启
•低功耗待机及快速启动
极低待机功耗（PWM为低）
•转速反馈
•霍尔偏置
•热关断保护
•UDFN-10封装
•符合RoHS规范及无铅，无卤
应用
•笔记本散热风扇
•静音风扇
EUM6882-PWM Fan Motor Driver with Slope Control and Low Duty Startup
Description
EUM6882 is a fan motor driver for brushless DC fan motor. It integrates three types speed control modes, low duty startup function, soft switched output, lock protection, Hall bias, FG output, shutdown mode, quick restart and TSD. With these modes and functions, EUM6882 can not only be applied to DC fans which require different speed curves, but also be applied to NB and other portable equipments which require silence and low power dissipation.
The three types speed control modes are PWM control mode, VCC control mode with slope adjustable, normal VCC control mode. Low duty startup function makes it possible for DC fan to start and restart under a very low PWM duty cycle. Soft switched output drives DC fan in low noise and low vibration. If a DC fan is stalled by the external force or obstacles, overdrive current may incur coil overheat and burning. 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. EUM6882 has built in Hall IC bias output, motor rotation speed feedback (FG). With its shutdown mode and quick restart, EUM6882 consume little power dissipation during shutdown time and can be started at once regardless of lock detection time.
Feature
•Single-Phase Full-Wave Driver System
•Three Speed Control Mode
PWM Control Mode
VCC Control Mode with Slope Adjustable
Normal VCC Control Mode
•Low Duty Startup
SD = H: Enable Low Duty Startup
SD = L: Disable Low Duty Startup
•Soft Switched Drive for Silent Application
•Lock Detection and Automatic Restart
•Shutdown Mode and Quick Restart
Low Standby Current (PWM = L)
•FG Output
•Hall Bias Output
•Thermal Shutdown Protection
•Available in UDFN-10 Package
•RoHS Compliant and 100% Lead (Pb)-Free Halogen-Free
Application
•NB Cooling Fan
•Silent Fan Motor |