A good PCB layout for the DRV2700RGPR involves keeping the high-current paths short and wide, using a solid ground plane, and placing the device close to the motor. TI provides a recommended PCB layout in the datasheet and application notes.
The sense resistor value depends on the motor current and the desired current sense accuracy. A general guideline is to choose a sense resistor that limits the voltage across it to 50-100 mV at the maximum motor current. TI provides a sense resistor calculation tool to help with this.
The internal bootstrap diode is used to generate the high-side gate drive voltage. It eliminates the need for an external bootstrap diode and reduces the component count. However, it also means that the high-side gate drive voltage is limited to VCC + 0.5 V, which may affect the design of the power stage.
The DRV2700RGPR has a built-in overcurrent protection feature that can be enabled by connecting the OCP pin to a resistor divider network. The device also has a fault detection pin that can be used to detect overcurrent, overtemperature, and undervoltage conditions. TI provides guidelines for implementing these features in the datasheet and application notes.
The DRV2700RGPR can operate up to 100 kHz, but the maximum operating frequency depends on the specific application and motor characteristics. TI recommends evaluating the device's performance at the desired frequency and ensuring that it meets the application's requirements.
DRV2700RGPR datasheet
by Texas Instruments
