AEC-Q100 Qualified 3-Phase Motor Controller for 100W to 1000W BLDC Motors

Melexis released its latest addition to its generation II embedded motor driver product portfolio for automotive applications, the MLX81206. This single-chip solution with 64KB Flash memory offers higher integration than the company's previous motor drivers, and it can drive 100W to 1000W BLDC motors.

Melexis designed the MLX81206/08 IC to control automotive BLDC motors via external FET transistors for 100W to 1000W applications such as HVAC blowers, engine cooling fans, water pumps, oil pumps, compressors and positioning actuators.

The MLX81206 supports a LIN 1.x/LIN 2.x and SAE J602 compliant interface, the most extensively used digital communications interface standards in the automotive sector, making it a simple solution for pre-driving a range of high-power BLDC motors. The IC's are pre-installed with Melexis certified LIN communication stack and optional support for UDS.

https://youtu.be/ywKX2jLODR8

MLX81206 integrates an embedded driver with high-voltage analog circuitry and digital technology, including Flash and non-volatile RAM memory along with an embedded microcontroller. This combination makes the MLX81206 a highly efficient and complete single-chip solution combining both hardware and software.

The synergy between sensing and drive control makes the MLX81206 an appropriate choice in terms of size, performance, and robustness. This synergy is apparent by the ease with which the device can interface to a range of sensors including the MLX90380 resolver for dynamic pumps driven in Field-Oriented-Control (FOC) mode. This IC can be delivered in a leaded package TQFP48 (MLX81208) or in a small footprint QFN32 package (MLX81206).

Features

• AEC-Q100 Grade 0 Qualified
• Microcontroller: MLX16-FX RISC CPU
  • 16-bit RISC CPU with 20MIPS and Power-Saving-Modes
  • Co-processor for fast multiplication and division
  • 64 KB Flash, 4KB RAM, 2 x 256B NVRAM memory with ECC
  • In-circuit debug and emulation support
• Supported Bus Interfaces
  • LIN interface with integrated LIN transceiver supporting LIN 2.x, SAE J2602; certified LIN protocol software provided by Melexis
  • In-Module programming (Flash and NVRAM) via pin LIN using Melexis FastLIN protocol
  • PWM interface
• Motor Controller
  • Patented algorithms for sensor-less 3-phase sine and trapezoidal motor control
  • Phase voltage integration filter for BEMF voltage sensing at lowest speeds
  • Support of Star and Delta based motor configurations without the need for center star point
• Voltage Regulator
  • Direct powered from 12V board net with low voltage detection
  • Operating voltage VS = 5V to 18V (20.2V as development goal)
  • Internal voltage regulator with possibility to use external regulator transistor
  • Very low standby current, <50µA in sleep mode, wake-up possible via LIN or local sources
• Pre-Driver
  • Pre-Driver for 3 N-FET half bridges with programmable Inter-Lock-Delay for optimal EMC and thermal performance during N-FET switching
  • Monitoring of Drain-Source voltages of the N-FETs
• Periphery
  • Full duplex SPI, Master/Slave, double-buffered, programmable speed, DMA access.
  • Full duplex UART
  • 4 independent 16-bit timer modules with capture and compare and additional software timer
  • 3 programmable 12-bit PWM units with programmable frequencies
  • 10-bit ADC (2µs conversion time) and DMA access
  • On-chip temperature sensor with ±10K accuracy
  • System-clock-independent fully integrated watchdog
  • 40MHz clock from internal RC oscillator with PLL
  • Load dump and brown out interrupt function
  • Integrated shunt current amplifier with programmable gain