A good PCB layout for the DRV8662RGPR 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 DRV8662RGPR evaluation module documentation.
The sense resistor value depends on the motor current and the desired current sense accuracy. A good starting point is to use the formula Rsense = 0.05 / Imax, where Imax is the maximum motor current. Then, adjust the value based on the desired current sense accuracy and the motor's characteristics.
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 around 12V, which may affect the design of the external gate drive circuitry.
The DRV8662RGPR has a built-in overcurrent protection feature that can be enabled by connecting the OC pin to a resistor divider network. The device also has a fault detection feature that can be used to detect overcurrent, overtemperature, and undervoltage conditions. The fault detection output can be used to trigger an interrupt or reset the device.
A decoupling capacitor with a value of 1-10uF is recommended, placed as close as possible to the DRV8662RGPR's power pins. The capacitor should be rated for the maximum voltage and current of the application. A good quality, low-ESR capacitor is recommended to minimize voltage ripple and ensure stable operation.
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About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
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