EUM6890R/S-PWM直接输入24V低噪声风扇驱动芯片  DataSheet
概述
EUM6890R/S是一款单相直流无刷马达驱动芯片，其通过PWM直接输入模式高效控制直流无刷风扇马达运转。其内置了最低转速设定、转速斜率设定、软启动、停转模式、风扇转速侦测、锁定保护、自动重启、噪声抑制、换相时间补偿、加速曲线斜率补偿、过电流保护和过热保护功能。
噪声抑制模式通过调整VREF引脚电阻，优化风扇噪声性能，实现风扇低噪声、低抖动运转；换相时间补偿能够进一步优化风扇运转噪声和提高风扇的运转效率；加速曲线斜率补偿能够补偿风扇马达造成的加速曲线非线性；最低转速设定通过预设RMIN引脚电压实现；停转模式占空比通过控制STOP引脚电压进行设定；转速斜率设定通过预设SL引脚电压实现；软启动控制模式能够有效抑制马达启动瞬间的尖峰浪涌电流，还能保证低转速运转时马达可靠启动。如果马达被外力或者障碍物卡住，则过驱动电流会引起温度升高而损坏马达，为了防止此类现象，芯片内置锁定保护电路关断内部功率管，切断马达驱动电流。几秒钟后自动重启电路将尝试重新启动。EUM6890R/S还具有FG/RD输出。
特点
•换相时间超前/滞后设置
•加速曲线斜率补偿
•风扇转速斜率外部设定
•内置过冲吸收电路，无需外接Zener
•外围元件少
•软启动和重启，外部可调
•宽工作电压(3.0V~30V)
•PWM直接输入控速
•最低转速外部设定(EUM6890R)
•噪声抑制外部可调 停转占空比外部设定(EUM6890S)
•锁定保护与自动重启
•内置霍尔偏置
•转速反馈FG及转动侦测RD输出
•TSSOP-16（EP）封装
•符合RoHS规范及无铅，无卤
应用
•PC/服务器风扇, 打印机以及变频器散热器
EUM6890R/S-24V Low Noise Fan Motor Driver with Direct PWM Input
Description
EUM6890R/S is a fan motor driver for the single coil brushless DC motor. It integrates minimum speed mode, adjustable speed slope control mode, soft start mode, stop mode, fan tachometer, lock protection, auto restart, noise controlled mode, phase advance/delay function, speed slope control compensation, OCP and TSD.
Noise control mode optimizes low noise performance with a SW pin’s resistor according to different requirements, and can drive the BLDC fan motor in low noise and low vibration. Phase advance/delay function can adjust the saddle current curve and further optimize the rotation noise and driving efficiency. Speed slope control compensation can compensate fan motor whose speed curve is not linear. Minimum speed mode can set minimum motor speed by presetting RMIN voltage. Stop speed mode can set stop PWM duty by presetting STOP voltage. The adjustable speed slope control mode can set fan speed slope by presetting SL voltage. Soft start suppresses high peak start-up current, which will also provide a reliable start-up even for low rotation speed. If the motor is stalled by external force or obstacles, overdrive current may incur coil overheat. To prevent this, lock protection circuit can shut down the internal power devices for a few seconds after motor lockup. Then auto restart circuit will try to power up these devices. EUM6890R/S has FG/RD output.
Feature
•Phase Advance/Delay Function
•Speed Slope Control Compensation
•Fan Speed Slope Control
•Built in Input Surge Protection, No Zener Diode Need
•Few External Components
•External Programmable Soft Start and Soft Restart Function
•Wide Input Range 3.0V~30V
•Direct PWM Fan Speed Control
•Programmable Minimum Fan Speed (EUM6890R only)
•Noise Control by an External Resistor
•Stop Mode PWM Duty Adjustable (EUM6890S only)
•Lock Protection and Auto Restart
•Built in Hall Bias
•Fan Rotation Speed Feedback FG Output
•Available in TSSOP-16(EP) Package
•RoHS Compliant and 100% Lead (Pb)-Free Halogen-Free
Application
•PC/Server Fan Motor, Printer Cooling Fan and Frequency Converter Coolers
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