A good PCB layout for the UCC21520ADW involves keeping the high-frequency switching nodes (e.g., SW and VIN) away from sensitive analog nodes, using a solid ground plane, and minimizing loop areas to reduce EMI. TI provides a recommended layout in the datasheet and application notes.
When selecting an input capacitor for the UCC21520ADW, consider the capacitor's voltage rating, capacitance value, ESR, and ripple current rating. A low-ESR capacitor with a voltage rating above the maximum input voltage and a capacitance value of 10-22 μF is recommended. TI provides guidance on input capacitor selection in the datasheet and application notes.
The UCC21520ADW has an operating temperature range of -40°C to 125°C. As the ambient temperature increases, the device's performance may degrade, and the maximum output current may decrease. Ensure proper thermal design and heat sinking to maintain reliable operation within the specified temperature range.
The UCC21520ADW has a built-in OCP and SCP feature. To implement OCP, set the OCP threshold using the OCSET pin, and for SCP, use the SCP pin to detect short-circuit conditions. TI provides detailed information on implementing OCP and SCP in the datasheet and application notes.
When selecting an output inductor for the UCC21520ADW, consider the inductor's saturation current, DC resistance, and core material. A suitable inductor should have a saturation current above the maximum output current, low DC resistance, and a core material with low core loss. TI provides guidance on output inductor selection in the datasheet and application notes.
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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.
