斜率可调及低占空比辅助启动的PWM风扇马达驱动芯片PWM Fan Motor Driver with Slope Control and Low Duty Startup CXMD3268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。CXMD3268能够驱动具有不同转速曲线要求的风扇，

   产品概述 返回TOPrch嘉泰姆

    CXMD3268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。CXMD3268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。CXMD3268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。CXMD3268具有霍尔芯片偏置输出，转速反馈输出。同时，CXMD3268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。CXMD3268 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, CXMD3268 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. CXMD3268has built in Hall IC bias output, motor rotation speed feedback (FG). With its shutdown mode and quick restart, CXMD3268consume little power dissipation during shutdown time and can be started at once regardless of lock detection time.

   产品特点 返回TOPrch嘉泰姆

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•单相全波驱动rch嘉泰姆

•三种转速控制模式</p>

PWM模式rch嘉泰姆

VCC加斜率可调模式</p>

VCC控制模式rch嘉泰姆

•低占空比辅助启动rch嘉泰姆

SD为高，开启此功能rch嘉泰姆

SD为低，关闭此功能rch嘉泰姆

•换相软切换</p>

•锁定保护及自动重启</p>

•低功耗待机及快速启动</p>

极低待机功耗（PWM为低）</p>

•转速反馈</p>

•霍尔偏置rch嘉泰姆

•热关断保护</p>

•UDFN-10封装rch嘉泰姆

•符合RoHS规范及无铅，无卤rch嘉泰姆

Single-Phase Full-Wave Driver Systemrch嘉泰姆

Three Speed Control Moderch嘉泰姆

PWM Control Moderch嘉泰姆

VCC Control Mode with Slope Adjustablerch嘉泰姆

Normal VCC Control Moderch嘉泰姆

Low Duty Startuprch嘉泰姆

SD = H: Enable Low Duty Startuprch嘉泰姆

SD = L: Disable Low Duty Startuprch嘉泰姆

Soft Switched Drive for Silent Applicationrch嘉泰姆

Lock Detection and Automatic Restartrch嘉泰姆

Shutdown Mode and Quick Restartrch嘉泰姆

Low Standby Current (PWM = L)rch嘉泰姆

FG Outputrch嘉泰姆

Hall Bias Outputrch嘉泰姆

Thermal Shutdown Protectionrch嘉泰姆

Available in UDFN-10 Packagerch嘉泰姆

RoHS Compliant and 100% Lead (Pb)-Freerch嘉泰姆

Halogen-Freerch嘉泰姆

   应用范围 返回TOPrch嘉泰姆

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•笔记本散热风扇</p>

•静音风扇rch嘉泰姆

NB Cooling Fanrch嘉泰姆

Silent Fan Motorrch嘉泰姆

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