Summary of Programmable driver runs motors quietly
The MTD6505 is a 3-phase sensorless BLDC driver featuring 180° sinusoidal drive for low noise and high efficiency. It supports 2V to 5.5V supplies, offers speed control via PSM or PWM, and includes built-in protections like thermal shutdown and lockup recovery. Designed for CPU cooling fans, it eliminates the need for Hall-effect sensors and external tuning while providing an FG output signal.
Parts used in the MTD6505 Project:
- MTD6505 device
- Programming Resistor (RPROG)
- DIR pin
- GND connection
- VBIAS connection
- Frequency Generator (FG) output
- Power supply modulation (PSM) circuitry
- Pulse-Width Modulation (PWM) circuitry
- 3×3 mm UDFN package
Dedcription
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.
Features
- 180° Sinusoidal Drive, for high efficiency and lowacoustic 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
- 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 AutomaticRecovery Circuit
- Built-in Overcurrent Limitation
- Built-in Thermal Shutdown Protection
- No External Tuning Required
Microchip has added to its range of sinusoidal, sensorless, 3-phase BLDC fan motor drivers with its first standalone, resistor-programmable driver.
The driver enables the selection of multiple back-EMF coefficient ranges, a feature which allows engineers to design for a variety of 3-phase BLDC fan characteristics with a single device.
The MTD6505 device’s 180-degree sinusoidal drive is designed to support energy efficiency, and with low acoustic noise and mechanical vibration.
Being a sensorless driver has no need for an external Hall-Effect sensor.
On-chip protection features include thermal shutdown, over-current limiting and lock-up protection.
It comes in a 3×3 mm UDFN package with a 0.5 mm thickness.
For more read: Programmable driver runs motors quietly
- Does the MTD6505 require a Hall-effect sensor?
No, the MTD6505 is a position sensorless driver that does not require an external Hall-effect sensor. - What voltage range does the MTD6505 support?
The device supports power supplies ranging from 2V to 5.5V. - How can speed control be achieved with this device?
Speed control is achieved through either power supply modulation (PSM) or pulse-width modulation (PWM). - What happens if the motor enters a lock condition?
The Lockup Protection mode turns off the output current, and the device features automatic recovery to restart the fan when the lock is removed. - Is external tuning required for the MTD6505?
No, the device requires no external tuning. - Can the direction of rotation be controlled?
Yes, forward direction is set by connecting the DIR pin to GND or leaving it floating, while reverse direction connects the DIR pin to VBIAS. - What protection features are included in the MTD6505?
It includes built-in overcurrent limitation, thermal shutdown protection, and lockup protection with automatic recovery. - What type of drive does the MTD6505 use?
It uses 180-degree sinusoidal drive to ensure high efficiency and low acoustic noise.
