MCT8316AT Tuning guide
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1 Introduction
The MCT8316AT provides three half-H-bridge integrated MOSFET drivers with sensorless trapezoidal control to drive a three-phase brushless DC (BLDC) motor at 12-V/24-V DC rails or battery powered applications. The device integrates three current-sense amplifiers (CSA) with integrated current sense for sensing the three phase currents of BLDC motors to achieve optimum trapezoidal control. Simplified schematic of MCT8316AT is shown in Figure 1-1.
This tuning guide provides the steps to tune a 3-phase BLDC motor using the MCT8316AT. The tuning process is classified into two sections: Quick tuning and Comprehensive tuning. This process is also detailed in the Guided tuning section in the GUI.
Quick tuning: The goal of quick tuning is to get the motor running quickly by providing default resistor values for RMP_1, RMP_2, LDANGLE, CONFIG_1, ILIMIT, CONFIG_2, CONFIG_3 and SLEW_RATE pins of MCT8316AT.
Comprehensive tuning: The comprehensive tuning section provides a simplified methodology for tuning critical device parameters such as Motor startup profile, motor startup method, lead angle, PWM switching frequency, Cycle by cycle current limit, abnormal speed threshold, slew rate and Buck voltage.
1.1 Hardware Setup
1.1.1 Jumper Configuration
Ensure the hardware is configured according to the jumper configuration as shown in Figure 1-2. Red boxes indicate where jumpers should be installed on the EVM.
Depopulate resistors R15 and R16 if they are populated on the MCx8316AEVM.
1.1.2 External Connections
Connect the motor to J8 (connections A, B, and C). If the motor has a center tap connection or wires for Hall-effect sensors, leave these wires unconnected. Supply a voltage compliant with the Power Supply Voltage (VM) range using J7. Recommended voltage range for the device is 4.5 V – 35 V.
Figure 1-3 MCx8316A EVM External
Configuration