The Microchip ATA6847 is a powerful 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, provides precise gate control, robust diagnostic capabilities, and safety-ready features.
The ATA6847 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.
Robust safety mechanisms such as cross-conduction protection, MOSFET voltage monitoring, dead-time control, and configurable fault filter/blanking times ensure safe and reliable operation under all conditions. Additional features include a window watchdog with cyclic wake-up and limp-home mode.
The ATA6847 complies with the requirements of the ISO 26262 ASIL B and IEC 61508 SIL 2 standards for applications which require functional safety.
Part Number: EV43F54A
The ATA6847 evaluation board provides a fully assembled hardware platform for evaluating and demonstrating the motor drive capabilities of the ATA6847 gate driver system basis chip (SBC) from Microchip. The ATA6847T-5033H/NHX device in combination with the dsPIC33CK64MP205 digital signal controller (DSC) provides the drive signals required to drive a three-phase brushless dc (BLDC) motor.
The board is optimized for input voltages from 4.9 V to 32.5 V. The firmware programmed on the DSC works with the AC300022 24 V three-phase BLDC motor in sensorless field oriented control mode.
Key features include:
● Drives up to a 35 A BLDC motor
● Two programmable gain/offset current sense amplifiers
● On/Off push button
● Reset push button
● Spare user programmable push button
● Wake-up push button
● PWM signal LED indicators
● Fault signal LED indicator
● PICkit™ debugger interface
● Speed control potentiometer
● Terminal block for 3.3 V and 5 V Hall effect sensors
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