霍尔信号接口PWM模式对风扇转速控制,单相直流无刷马达驱动芯片

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产品概述 返回TOP
CXMD3270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。CXMD3270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。CXMD3270内置功能包括PWM控制模式、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。小转速由RMIN来设置风扇转动时的低速度。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，CXMD3270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。CXMD3270还具有转速回馈输出、锁定报警输出和霍尔偏置输出。CXMD3270/C is a fan motor driver for the single coil brushless DC motor. With its high efficient direct PWM control mode, CXMD3270/C controls the speed of brushless DC motor with a built in HALL IC interface. CXMD3270/C is suitable to drive variable speed motors for personal computer’s power supply radiation fans and CPU coolers. CXMD3270C integrates 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. CXMD3270C can set minimum fan speed by presetting RMIN voltage. With soft start function, CXMD3270C can 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, CXMD3270C shuts off power devices for a few seconds. The lock protection delay time is externally programmable by a capacitor. CXMD3270C has built in motor rotation speed feedback (FG) output, motor rotation detection (RD) output and Hall sensor bias output.
产品特点 返回TOP
• 18V单相全波驱动输出
• 内置过冲吸收电路，无需外接Zener
• 软启动和重启，外部可调
• 宽工作电压（3V～18V）
• PWM控制模式
• 小转速设定
• 内置Soft Switching
• 内置霍尔偏置
• 锁定保护与自动重启
• FG输出 (CXMD3270)
• RD输出 (CXMD3270)
• 内置热关断
• TSSOP-16与TDFN-14封装
• 符合RoHS规范及Pb-Free，Halogen-Free

Built in 18V Full-wave Motor Driver for Fan
Motor

Built in Input Surge Protection, No Zener Diode
Need

External Programmable Soft Start and Soft
Restart Function (CXMD3270)

Wide Input Range 3V~18V

PWM Fan Speed Control

Programmable Minimum Fan Speed

Built in Soft Switching Function

Built in Hall Bias

Lock Protection and Auto Restart

Fan Rotation Speed Feedback FG Output

Fan Rotation Detection RD Output

Thermal Shutdown Protection

Available in TSSOP-16 Package

RoHS Compliant and Lead (Pb)-Free
Halogen-Free
应用范围 返回TOP
• PC电源、CPU散热风扇等

Personal Computer’s Power Supply Radiation
Fans and CPU Coolers