The Microchip ATA6847L is a three-phase motor driver system basis chip (SBC) for use in automotive and industrial brushless dc (BLDC) motor-control systems.
Built on advanced silicon-on-insulator (SOI) technology, this highly integrated motor driver SBC, supplied in a compact QFN package, includes a local interconnect network (LIN) transceiver and provides precise gate control, robust diagnostic capabilities for safe operations.
The ATA6847L works alongside a microcontroller and six external NMOS transistors to enable independent gate-drive control for each MOSFET, allowing full 0% to 100% PWM duty cycle operation via dual charge pumps. This enables sensorless BLDC motors to operate at high efficiency, even during start/stop or crank pulse events.
The chip includes two precision current-sense amplifiers with configurable gain and output offset, plus advanced current limitation using an operational amplifier and DAC. The integrated back-EMF detection module enables sensorless motor control with motor neutral point emulation, eliminating the need for external position sensors.
Safety mechanisms such as cross-conduction protection, MOSFET voltage monitoring, dead-time control, and configurable fault filter/blanking times are included on the ATA6847L, ensuring reliable operation under varying conditions.
Part Number: EV94U98A
The EV94U98A evaluation board provides a fully assembled hardware platform for evaluating and the motor drive capabilities of the ATA6847L gate driver system basis chip (SBC) from Microchip.
The board is optimized for input voltages from 4.9V to 32.5V and can drive up to a 35A RMS BLDC motor.
Key features include:
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