 Melexis Introduces its Second-Generation Sensorless BLDC Motor Controller Family
The MLX81205, MLX81207, MLX81210, MLX81215 are each members of a highly integrated 3 phase motor controller family for 12V automotive applications. The family includes versions in different memory configurations, pin counts and packages.
It follows the Melexis high integration concept by putting a 16-bit-Flash-Microcontroller, voltage regulator, LIN-Protocol, Power-FET-Gate-Driver and several blocks for BLDC motor operation in one single IC. The Power-FET-Gate-Driver has an implemented slope control and allows the optimization for EMC and power dissipation during the switching process of the Power-FETs in Software.
The chip family supports sensor-less and sensor based BLDC motor operation.
The family addresses mainly permanent running BLDC motors, that can be found in pumps, blowers and fans, but also positioning BLDC actuators can be supported.
Also this family follows the Melexis TruSense sensor-less BLDC motor control technology.
What is TruSense?
The Melexis TruSense technology combines reluctance measurements with BEMF (Back Electro-Motive Force) sensing, yielding highly accurate rotor position information, in a very wide dynamic range and under heavily changing loads.
Because of that, also very demanding applications operating under unknown torque such as transmission oil pumps, can be controlled in a sensor-less way.
The PWM driving scheme might be adapted to any motor current shape, achieving the best possible efficiency, low torque ripple and minimal conducted and radiated emissions.
TruSense also allows a very fast motor start-up as well as operation at very low speeds. TruSense supports block mode commutation, trapezoidal and sinusoidal motor currents, achieving low noise performance.
TruSense Family Feature Comparison
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| Flash Memory (kBytes) |
32 |
32 |
32 |
64 |
| RAM (kBytes)
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4 |
4 |
8 |
8 |
| EEPROM (Bytes) |
384 |
384 |
384 |
384 |
| Package |
QFN32 |
QFN48
TQFP48 |
QFN48
TQFP48 |
QFN48
TQFP48 |
Features and Benefits
- "Sensorless" BLDC Motor Control
- Very robust
- Wide dynamic range
- Fast start-up, accelerate and run under unknown load conditions
- Low noise operation
- Block, trapezoidal and sinusoidal motor currents
- Delta and star motor configuration (no star point required)
- High Integration Level
- Embedded Flash controller for high temperature environment
- Voltage regulator
- RC/XTAL oscillator
- NFET predriver with bootstrap, VDS monitor and adjustable slew rate control for EMC and thermal optimization of Power-FET switching
- Integrated LIN or PWM protocol
- Flash programming on module level via 1 pin LIN or PWM interface
- AEC-Q100 Grade 0 qualified up to 150C ambient temperature
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Target Applications
- Pumps:
- Fuel pump
- Main water pump
- Water recirculation pump
- Water pump for battery cooling
- Transmission oil pump
- Lubricant oil pump
- ABS and EHPS oil pump
- Fans/Blowers:
- Engine cooling fan
- HVAC blower
- Blower for battery cooling
- Compressors:
- Compressor for active suspension
- Other:
- Electric Parking Brake
- Sensor-less and sensor based BLDC motor applications controlled by the Local Interconnect Network (LIN) or PWM.
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