Catalog
5v 3 phase sensorless brushless dc fan controller
Key Features
• * Position sensorless BLDC drivers (no Hall sensor required)
• * 180° sinusoidal drive, for high efficiency and low acoustic noise
• * Support 2V to 5.5V power supplies
• * Speed control through PAM and/or PWM
• * Built-in directional control (DIR) pin
• * Built-in frequency generator
• * Built-in lockup protection and automatic recovery circuit (external capacitor not necessary)
• * Built-in over current limitation and short circuit protection
• * Built-in thermal shutdown protection
• * No external tuning required
Description
AI
The MTD6502B is a 3-phase full-wave driver for brushless sensorless DC motors. They feature 180° sinusoidal drive, high torque output, and silent drive. Due to their adaptive features and wide power-supply range capabilities (2 to 5.5V) they are intended to cover a wide range of motor characteristics, while requiring no external tuning from the user. Speed control can be achieved through either power supply modulation or pulse-width-modulation (using the PWM digital input pin). Due to the compact packaging and minimum bill-of-material (power transistors incorporated, no Hall sensor, no external tuning), they are best suited for low-cost fan applications requiring high efficiency and low acoustic noise, such as CPU cooling fans. Frequency generator output is also included, enabling for precision speed control in closed-loop applications. The MTD6502B drivers include a lockup protection mode, which turns-off the output current when the motor is under lock condition, and an automatic recovery that enables the fan to run when the lock condition is removed. Motor over-current limitation, short-circuit protection, and thermal-shutdown protection are also included.
