High-performance motor gate driver with LIN transceiver for brushless motor control
The ATA6847L from Microchip works with external controller and power devices to provide a complete solution for brushless dc motor system control and integrates a LIN transceiver and diagnostics for safe operation.
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.