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  • DRV8305N 3-Phase Brushless DC Motor Driver

  • Created: Aug 11, 2016

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Summary

Brushless motors, which are also known as BLDC, are synchronous motors, which means that the magnetic field generated by the stator and the magnetic field generated by the rotor rotate at the same frequency. The reference design is an evaluation board for DRV8305 gate driver IC for three phase motor-drive applications. The device provides three high-accuracy and temperature compensated half-bridge drivers, each capable of driving a high-side and low-side N-channel MOSFET.


The BOOSTXL-DRV8305EVM BoosterPack supplies 3.3 V to the LaunchPad through the onboard LMR16006 0.6-A, step-down buck regulator. By integrating three half-bridge drivers, charge pump, three current shunt amplifiers, 3.3-V or 5-V, 50-mA LDO the extra component for the design is avoided. The gate driver of DRV8305 uses a tripler charge pump to generate the appropriate gate to source voltage bias for the external, high-side N-channel power MOSFETs during low supply conditions. The BoosterPack has been designed with voltage sense circuits on the DC bus (PVDD) and each half-bridge outputs (phases A, B, and C). To reduce the high frequency noise on the ADC pins, a voltage divider network together with a filtering capacitor is connected to PVDD port. The BoosterPack connects GPIO signals (nFault, PWRGD, EN_GATE, WAKE) from DRV8305 to the Launchpad. To address shoot-through problems, an internal handshaking is used to minimize the dead time when transitioning between MOSFETs in each half-bridge. The SPI communication of DRV8305 detailed fault reporting, diagnostics, and device configurations such as gain options for the current shunt amplifier, individual MOSFET overcurrent detection, and gate-drive slew-rate control.


The BOOSTXL-DRV8305EVM is not a standalone motor control kit and requires a compatible XL LaunchPad to provide the appropriate motor control signals. The DRV8305 can be applied in CPAP, pumps, robotics, and RC toys. The DRV8305 provides also overcurrent, over temperature, overvoltage, and undervoltage protection. It can also tolerate a load dump up to 45V.

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