目录

1.产品概述       2.产品特点     a4R嘉泰姆

3.应用范围       4.技术规格书下载（PDF文档）a4R嘉泰姆

5.产品封装       6.电路原理图  a4R嘉泰姆

7.相关产品a4R嘉泰姆

   产品概述 返回TOPa4R嘉泰姆

    CXMD3271是一款单相直流无刷马达驱动芯片，它内置霍尔信号接口，通过PWM模式对风扇转速进行控制。CXMD3271非常适用于PC电源风扇和CPU散热风扇中的可控转速马达驱动。CXMD3271内置功能包括PWM控制模式、最小转速设置、软启动、风扇转速检测、锁定保护、自动重启和霍尔偏置输出。PWM模式可通过调节RCTL电压控制芯片输出，使马达转速可调并保持低噪声、低抖动。最小转速由RMIN来设置风扇转动时的最低速度。软启动功能使风扇在启动时由慢到快逐渐加速，且加速时间可通过SS电容外部调节。如果风扇被外部应力或者障碍物卡住，则过驱动电流可能引起温度升高而损坏马达。为了防止此类现象，CXMD3271内置锁定保护以关断功率管，切断马达驱动电流。几秒钟后再自动重启，尝试恢复驱动。锁定保护和自动重启时间可由芯片外接电容设定。CXMD3271还具有转速回馈输出、锁定报警输出和霍尔偏置输出。CXMD3271 is a fan motor driver for the single coil brushless DC motor. With its high efficient direct PWM control mode, CXMD3271 controls the speed of brushless DC motor with a built in HALL IC interface. CXMD3271 is suitable to drive variable speed motors for personal computer’s power supply radiation fans and CPU coolers. CXMD3271integrates PWM fan speed control, minimum speed mode, soft start, fan tachometer, lock protection, auto restart and Hall Bias functions. PWM mode controls fan speed in low noise and low vibration ways by adjusting RCTL voltage. CXMD3271can set minimum fan speed by presetting RMIN voltage. With soft start function, CXMD3271can drive motor from slow speed to fast speed in a settable time by setting the external capacitor between SS and GND. If a fan motor 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. If the lock persists, ECXMD3271shuts off power devices for a few seconds. The lock protection delay time is externally programmable by a capacitor. ECXMD3271has built in motor rotation speed feedback (FG) output, motor rotation detection (RD) output and Hall sensor bias output.

   产品特点 返回TOPa4R嘉泰姆

• 24V单相全波驱动输出a4R嘉泰姆

• 内置过冲吸收电路，无需外接Zenera4R嘉泰姆

• 软启动和重启，外部可调a4R嘉泰姆

• 宽工作电压（3V～28V）a4R嘉泰姆

• PWM控制模式a4R嘉泰姆

• 最小转速设定a4R嘉泰姆

• 内置Soft Switchinga4R嘉泰姆

• 内置霍尔偏置a4R嘉泰姆

• 锁定保护与自动重启a4R嘉泰姆

• FG输出 (CXMD3271)a4R嘉泰姆

• RD输出 (CXMD3271)a4R嘉泰姆

• 内置热关断a4R嘉泰姆

• TSSOP-16和TDFN-14封装a4R嘉泰姆

• 符合RoHS规范及Pb-Free，Halogen-Freea4R嘉泰姆

Built in 24V Full-wave Motor Driver for Fan Motora4R嘉泰姆

Built in Kickback Voltage Protection, No Zener Diode Needa4R嘉泰姆

External Programmable Soft Start and Soft Restart Functiona4R嘉泰姆

Wide Input Range 3V~28Va4R嘉泰姆

PWM Fan Speed Controla4R嘉泰姆

Programmable Minimum Fan Speeda4R嘉泰姆

Built in Soft Switching Functiona4R嘉泰姆

Built in Hall Biasa4R嘉泰姆

Lock Protection and Auto Restarta4R嘉泰姆

Fan Rotation Speed Feedback FG Outputa4R嘉泰姆

Fan Rotation Detection RD Outputa4R嘉泰姆

Thermal Shutdown Protectiona4R嘉泰姆

Available in TSSOP-16 Packagea4R嘉泰姆

RoHS Compliant and 100% Lead (Pb)-Freea4R嘉泰姆

Halogen-Freea4R嘉泰姆

   应用范围 返回TOPa4R嘉泰姆

• PC电源、CPU散热风扇等a4R嘉泰姆

PC/Server Fan Motor, CPU Coolers and Printera4R嘉泰姆

Cooling Fana4R嘉泰姆

   技术规格书（产品PDF) 返回TOP a4R嘉泰姆

     需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！a4R嘉泰姆

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产品封装图 返回TOPa4R嘉泰姆

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电路原理图 返回TOPa4R嘉泰姆

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