A good PCB layout for the UCC21520DW involves keeping the input and output stages separate, using a solid ground plane, and minimizing loop areas for the high-frequency circuits. TI provides a recommended layout in the application note SLUA623.
When selecting a transformer for the UCC21520DW, consider the voltage ratio, turns ratio, magnetizing inductance, and leakage inductance. The transformer should be designed to handle the maximum output power and voltage of the converter. TI provides a transformer design guide in the application note SLUA624.
To ensure reliable operation of the UCC21520DW, it's essential to provide adequate thermal management. This includes using a heat sink, ensuring good airflow, and keeping the junction temperature below 150°C. TI provides thermal design guidelines in the application note SLUA625.
The UCC21520DW has built-in OCP and OVP features. To implement OCP, connect a sense resistor in series with the output inductor and connect the sense pin to the OCP pin. For OVP, connect a voltage divider network to the OVP pin to monitor the output voltage. TI provides detailed implementation guidelines in the datasheet.
The UCC21520DW is a higher-power version of the UCC21510, with a higher maximum output power and voltage rating. The UCC21520DW also has additional features such as adjustable undervoltage lockout (UVLO) and a wider input voltage range. TI provides a comparison table in the datasheet.
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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.
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