TI recommends a 4-layer PCB with a solid ground plane, and placing the UCC2893PW close to the input capacitors and output inductors. Additionally, keep the high-frequency switching nodes (e.g., SW and VIN) away from sensitive analog nodes.
Use TI's WEBENCH Power Designer tool or a similar simulation tool to optimize the compensation network. Start with the recommended values in the datasheet and adjust based on the specific application requirements and component tolerances.
Choose capacitors with low ESR, high ripple current rating, and suitable voltage rating. For input capacitors, consider X7R or X5R dielectrics, and for output capacitors, consider X7R, X5R, or OS-CON dielectrics. Ensure the capacitors are rated for the maximum operating voltage and temperature range.
Implement a soft-start circuit to limit the inrush current during startup. Use a voltage supervisor or a power-good signal to ensure the UCC2893PW is enabled only when the input voltage is within the recommended range. During shutdown, ensure the input voltage is ramped down slowly to prevent voltage spikes.
Use a thermal pad or a heat sink to dissipate heat from the UCC2893PW. Ensure good airflow around the device, and consider using a thermal interface material (TIM) to improve heat transfer. Monitor the junction temperature (TJ) and adjust the design to keep TJ below the recommended maximum of 150°C.
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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.
