Microchip公司的MTD6505是三相全波無傳感器BLDC馬達控制器,具有180度正弦驅動,高轉矩輸出和安靜驅動,工作電壓2V到5.5V,內置頻率發生器(FG),鎖住保護和自動恢復電路,過流限制,熱關斷保護和風細雨過壓保護.主要用在筆記本電腦CPU冷卻風扇和5V三相BLDC馬達.本文介紹了MTD6505主要特性,方框圖,典型應用電路以及三相BLDC無傳感器風扇控制器演示板主要特性,電路圖和材料清單.
The MTD6505 device is a 3-phase full-wave sensorless driver for brushless DC (BLDC) motors. It features 180° sinusoidal drive, high torque output and silent drive. With the adaptive features, parameters and wide range of power supplies (2V to 5.5V), the MTD6505 is intended to cover a broad range of motor characteristics, while requiring minimum external components. Speed control can be achieved through either power supply modulation (PSM) or pulse-width modulation (PWM).
The compact packaging and the minimal bill-of material make the MTD6505 device extremely cost efficient in fan applications. For example, the CPU cooling fans in notebook computers require designs that provide low acoustic noise, low mechanical vibration, and are highly efficient. The frequency generator (FG) output enables precision speed control in closed-loop applications.
The MTD6505 device includes Lockup Protection mode to turn off the output current when the motor is in a lock condition, with an automatic recovery feature to restart the fan when the lock condition is removed.Motor overcurrent limitation and thermal shutdown protection are included for safety enhanced operations.
The MTD6505 is available in a compact, thermally enhanced, 3mm x 3mm 10-lead UDFN package.
MTD6505主要特性:
• 180° Sinusoidal Drive, for high efficiency and low acoustic noise
• Position Sensorless BLDC Drivers (No Hall-effect sensor required)
• Integrated Power Transistors
• Supports 2V to 5.5V Power Supplies
• Programming Resistor (RPROG) setting to fit motor constant (Km) range from 3.25 mV/Hz to 52 mV/Hz
• Direction Control:
- Forward direction: connect DIR pin to GND or leave floating
- Reverse direction: connect DIR pin to VBIAS or 3V
• Speed Control through Power Supply Modulation (PSM) and/or Pulse-Width Modulation (PWM)
• Built-in Frequency Generator (FG Output Signal)
• Built-in Lockup Protection and Automatic Recovery Circuit
• Built-in Overcurrent Limitation
• Built-in Thermal Shutdown Protection
• Built-in Over Voltage Protection
• No External Tuning Required
• Available Package 10-Lead 3mm x 3mm UDFN
MTD6505應用:
• Notebook CPU Cooling Fans
• 5V 3-Phase BLDC Motors
圖1. MTD6505方框圖
圖2. MTD6505典型應用電路圖
MTD6505三相BLDC無傳感器風扇控制器演示板
MTD6505 3-Phase BLDC Sensorless Fan Controller Demonstration Board 
The MTD6505 3-Phase BLDC Sensorless Fan Controller Demonstration Board allows the control and monitoring of the MTD6505 device using PC software connected to the board via a USB connection. The included board software provides several features including VDD control and monitoring, pulse-width modulation (PWM) control, speed and current consumption monitoring. It also allows selecting the RPROG resistor value for fan fitting.
風扇控制器演示板包括:
• 1x MTD6505 3-Phase BLDC Sensorless Fan Controller Demonstration Board (ADM00345)
• 3x Plug-In Modules with soldered on MTD6505 (3x3x0.5 mm UDFN-10L)
• 1x 3-Phase BLDC fan
• 1x Mini-USB cable
圖3. MTD6505三相BLDC無傳感器風扇控制器演示板外形圖風扇控制器演示板
風扇控制器演示板主要特性:
• Abilities to control and monitor a 3-Phase BLDC fan or motor through the MTD6505 device
• Four selectable KM ranges through GUI software
• Advanced measurements is available for broad range of 3-Phase BLDC fan validation
圖4.風扇控制器演示板電路圖
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