TI recommends a 4-layer PCB with a solid ground plane, and a separate power plane for the input and output stages. Keep the input and output traces short and away from each other to minimize noise and EMI. Use a low-ESR capacitor for the output filter and ensure good thermal conduction for the device.
The output filter components (L, C, and R) depend on the output voltage, current, and desired ripple. TI provides a filter design tool and application notes to help with component selection. Generally, choose an inductor with low DCR and high saturation current, and a capacitor with low ESR and high ripple current rating.
The UC2572D has an absolute maximum input voltage rating of 18V. However, for reliable operation, TI recommends keeping the input voltage below 15V to ensure proper regulation and to prevent damage to the device.
The UC2572D has a built-in overcurrent protection feature that can be enabled by connecting a resistor between the OC pin and GND. For fault detection, use the Power Good (PG) pin, which goes low in case of an output fault or undervoltage. You can also use external circuitry to detect overvoltage, undervoltage, and overtemperature conditions.
TI recommends using a low-ESR, high-frequency ceramic capacitor (e.g., X5R or X7R) with a value between 1uF to 10uF, depending on the input voltage and current. The input capacitor helps to filter out noise and ensure stable operation.
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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.
