A good PCB layout for the UCC21521ADW involves keeping the high-frequency switching nodes (e.g., SW and VIN) away from sensitive analog nodes, using a solid ground plane, and minimizing the length of the power traces. TI provides a recommended PCB layout in the application note SLUA623.
To ensure the UCC21521ADW operates within its SOA, monitor the device's junction temperature (TJ) and ensure it does not exceed 150°C. Also, keep the input voltage (VIN) within the recommended range (4.5V to 18V), and avoid exceeding the maximum current ratings for the output (IOUT) and input (IIN).
When selecting L and COUT, consider the desired output voltage ripple, inductor core loss, and capacitor ESR. A good starting point is to choose an inductor with a high saturation current rating and a capacitor with a low ESR. TI provides a detailed inductor and capacitor selection guide in the application note SLUA623.
The UCC21521ADW has a built-in OCP and SCP feature. To implement OCP, set the OCP threshold voltage (VOCSET) using an external resistor divider. For SCP, connect a sense resistor (RS) in series with the output inductor to detect overcurrent conditions. TI provides a detailed implementation guide in the application note SLUA623.
To ensure reliable operation, ensure good thermal conduction between the UCC21521ADW and the PCB. Use a thermal pad or thermal interface material to improve heat transfer. Keep the device's junction temperature (TJ) below 150°C, and avoid operating the device in high-temperature environments (above 85°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.
