A good PCB layout for the UCC21521DW 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 UCC21521DW, consider the voltage ratio, turns ratio, magnetizing inductance, and leakage inductance. TI recommends using a transformer with a turns ratio of 1:1 or 1:1.5, and a magnetizing inductance of at least 10 μH. The application note SLUA623 provides more guidance on transformer selection.
To ensure reliable operation of the UCC21521DW at high temperatures, it's essential to provide adequate heat sinking, use a thermal interface material, and keep the device away from heat sources. The device has a maximum junction temperature of 150°C, and TI recommends keeping the case temperature below 100°C for reliable operation.
The UCC21521DW has a built-in overcurrent protection feature that can be enabled by connecting the OCP pin to a resistor divider network. The recommended threshold values are 1.5 A to 3 A, depending on the application requirements. TI provides more guidance on implementing overcurrent protection in the datasheet and application notes.
The main differences between the UCC21521DW and the UCC21520 are the output voltage range, maximum output current, and package type. The UCC21521DW has a wider output voltage range (up to 1200 V) and higher maximum output current (up to 5 A) compared to the UCC21520. The UCC21521DW is also available in a smaller package (SOIC-8) compared to the UCC21520 (SOIC-16).
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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.
