A good PCB layout for the UCC27201DRMT involves keeping the high-frequency switching nodes (e.g., SW and VIN) away from sensitive analog nodes, using a solid ground plane, and minimizing trace lengths and loop areas. TI provides a recommended PCB layout in the application note SLUA623.
To ensure reliable start-up, ensure that the input voltage (VIN) rises slowly (e.g., < 10 ms) and monotonically, and that the EN pin is pulled high after VIN reaches the minimum operating voltage (VCC UVLO threshold). Also, add a soft-start capacitor (CSS) to limit the inrush current.
The maximum allowed voltage on the SW pin is 35 V. To protect the SW pin from overvoltage, use a clamp circuit (e.g., a zener diode and a resistor) to limit the voltage to 35 V. Additionally, ensure that the output capacitor (COUT) is rated for the maximum output voltage.
To optimize the compensation network, use the TI WEBENCH Power Designer tool or follow the guidelines in the application note SLUA623. The goal is to achieve a stable, high-bandwidth control loop with adequate phase margin (> 45°) and gain margin (> 10 dB).
The UCC27201DRMT has a maximum junction temperature (TJ) of 150°C. Ensure reliable operation by providing adequate heat sinking, using a thermal pad or heat sink, and keeping the device away from heat sources. Monitor the device temperature using the thermal monitoring pin (TMP) and take corrective action if the temperature exceeds 125°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.
