Description:Motor / Motion / Ignition Controllers & Drivers 24-V max 5-A peak three-phase motor driver with integrated FETs and current sensing 36-WQFN -40 to 125
Texas Instruments provides a recommended PCB layout in the DRV8317HREER evaluation module (EVM) user's guide, which includes guidelines for component placement, routing, and thermal management to ensure optimal performance and minimize electromagnetic interference (EMI).
The selection of current sense resistors depends on the desired current sense accuracy, power dissipation, and noise tolerance. TI recommends using a low-ohmic resistor (e.g., 0.01 ohm to 0.1 ohm) with a high power rating (e.g., 1/4 W to 1 W) and a low temperature coefficient of resistance (TCR). The datasheet provides a formula to calculate the current sense resistor value based on the desired current sense accuracy and the motor current.
The bootstrap capacitors (CBOOT) are used to generate the high-side gate drive voltage for the power MOSFETs. The recommended value for CBOOT is 10 nF to 100 nF, depending on the switching frequency and the power MOSFET's gate capacitance. A larger capacitor value can reduce the voltage ripple on the high-side gate drive, but may increase the turn-on time and reduce the overall efficiency.
The DRV8317HREER is a general-purpose motor driver that can be configured for different motor types by adjusting the input pins (e.g., IN1, IN2, and EN) and the external components (e.g., resistors and capacitors). TI provides application notes and design guides for specific motor types, which include configuration examples and component selection guidelines.
The DRV8317HREER has an operating temperature range of -40°C to 125°C, with a maximum junction temperature (TJ) of 150°C. However, the device's performance and reliability may degrade at high temperatures, so it's essential to ensure proper thermal management and cooling in the system design.
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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.
