The UCC2805PW is a high-frequency switching converter, so it's essential to follow good layout practices to minimize noise and EMI. TI recommends placing the IC close to the input capacitors, using a solid ground plane, and keeping the high-current paths short and wide. A good layout example can be found in the TI application note SLUA365.
Choosing the right inductor involves considering factors such as inductance value, saturation current, and core material. TI recommends using an inductor with a value between 1-10 μH, a saturation current rating above the peak current, and a core material with low core loss (e.g., ferrite or powdered iron). The TI inductor selection guide (SLUP133) can help with this process.
The UCC2805PW has an absolute maximum input voltage rating of 18 V. However, the recommended operating input voltage range is 8-15 V. Exceeding the maximum rating can damage the IC, so it's essential to ensure that the input voltage is within the recommended range.
The UCC2805PW's voltage feedback loop requires compensation to ensure stability. TI recommends using a type-II compensation network, which consists of a resistor, capacitor, and another capacitor in series. The values of these components can be calculated using the TI compensation calculator tool or by following the guidelines in the UCC2805PW datasheet.
The soft-start pin (SS) is used to control the startup sequence of the converter. By connecting a capacitor to the SS pin, the output voltage ramps up slowly, reducing inrush current and electromagnetic interference (EMI). The soft-start time can be adjusted by changing the value of the capacitor.
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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.
