Texas Instruments recommends a 4-layer PCB with a solid ground plane, and to keep the input and output stages separate to minimize EMI. Additionally, it's recommended to use a shielded inductor and to keep the switching node (SW) away from sensitive nodes.
The inductor selection depends on the output current, output voltage, and switching frequency. A good starting point is to use the inductor selection guide provided by Texas Instruments, and to consider factors such as inductor core material, inductance value, and DC resistance.
The maximum junction temperature (Tj) for the UCC2889D is 150°C. However, it's recommended to keep the junction temperature below 125°C for reliable operation and to avoid thermal shutdown.
Yes, the UCC2889D is rated for operation up to 125°C ambient temperature. However, it's essential to consider the derating of the device's performance and the reliability of the system at high temperatures.
Start by checking the input voltage, output voltage, and switching frequency. Use an oscilloscope to check for ringing, overshoot, or undershoot on the output voltage. Also, check the thermal performance of the device and the PCB layout for any potential issues.
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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.