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Microchip Technology MTD6508 Motor Driver

Microchip Technology MTD6508 Motor Driver is a three-phase, full-wave, sensorless driver for Brushless DC (BLDC) motors. The MTD6508 features a 180° sinusoidal drive, high torque output, and silent drive. The MTD6508 offers adaptive features, parameters, and a wide 2.0V to 5.5V supply power range, allowing the device 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 a minimal bill of materials make the MTD6508 ideal for fan applications. The frequency generator (FG) output enables precision speed control in closed-loop applications.

The MTD6508 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. Motor overcurrent limitation and thermal shutdown protection are included for safety-enhanced operations.

The Microchip Technology MTD6508 Motor Driver is offered in compact, thermally-enhanced, UDFN-10 and UQFN-16 packages.

Features

  • 180° sinusoidal drive, for high efficiency and low acoustic noise
  • 2.0V to 5.5V operating voltage range
  • Position sensorless BLDC drivers
  • No hall-effect sensor required
  • Integrated power transistors
  • Programming resistor (RPROG) setting to fit motor constant (Km) range from 3.25mV/Hz to 52mV/Hz
  • Direction Control
  • Forward direction: connect DIR pin to GND or leave floating
  • Reverse direction: connect DIR pin to VBIAS
  • Output PWM slew rate control programmable with an external resistor for start-up (adjustable version)
  • Phase target selection for regulation (adjustable Version)
  • Start-up strength selection (adjustable Version)
  • 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
  • Low minimal start-up speed for low-speed operation
  • No external tuning required
  •  -40°C to +125°C operating temperature range
  • Package options
    • 3.0mm x 3.0mm x 0.5mm UDFN-10
    • 4.0mm x 4.0mm x 0.5mm UDFN-16

Applications

  • Notebook CPU Cooling Fans
  • 5V 3-Phase BLDC Motors

Development Tools

Functional Block Diagram

Microchip Technology MTD6508 Motor Driver
Opublikowano: 2017-07-12 | Zaktualizowano: 2022-03-21