PWM直接输入全波驱动输出模式,控制直流无刷马达驱动芯片

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产品概述 返回TOP
CXMD3273R/S是一款单相直流无刷马达驱动芯片，其通过PWM直接输入模式控制直流无刷马达运转。CXMD3273R/S内置功能包括小转速设定、停转模式、转速斜率设定、软启动、风扇转速检测、锁定保护、自动重启、过热保护、过电流保护和噪声抑制等功能。噪声抑制模式通过调整SW引脚电阻，优化无刷直流风扇马达的噪声性能，实现马达低噪声、低抖动运转；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。CXMD3273R/S还具有转速回馈输出。CXMD3273R/S is a motor driver for single coil brushless DC motor. With its high efficient direct PWM control mode, CXMD3273R/S can control the speed of brushless DC motor. It integrates minimum speed mode, stop mode, adjustable speed slope control mode, soft start mode, fan tachometer, lock protection, auto restart, TSD, OCP and noise controlled mode. 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. 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. CXMD3273R/S has FG output.
产品特点 返回TOP
•单相全波驱动输出
•外围组件少
•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直接输入控速
•低转速外部设定（CXMD3273R）
•噪声抑制外部可调
•停转占空比外部设定（CXMD3273S）
•风扇转速斜率外部设定
•内置过电流保护
•锁定保护与自动重启
•内置霍尔偏置
•FG输出
•TSSOP-16和TSSOP-14（EP）封装
•符合RoHS规范及无铅，无卤

Single-phase Full-wave Driver

Few External Components

Built-in Input Surge Protection, No Zener Diode
Need

External Programmable Soft Start and Soft
Restart Function

Wide Input Range 3.0V~18V

Direct PWM Fan Speed Control

Programmable Minimum Fan Speed
(CXMD3273R only)

Programmable Noise Control by an External
Resistor

Stop Mode PWM Duty Adjustable
(CXMD3273S only)

Fan Speed Slope Control

Built-in Over Current Protection Function

Lock Protection and Auto Restart

Built in Hall Bias

Fan Rotation Speed Feedback FG Output

Available in TSSOP-16 and TSSOP-14 (EP)
Packages

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

Personal Computer’s Power Supply Radiation
and CPU/VGA Cooler