Texas Instruments provides a recommended PCB layout in the UCC28C40 application note (SLUA144). It's essential to follow the guidelines for component placement, trace routing, and thermal management to ensure optimal performance and minimize electromagnetic interference (EMI).
The input capacitor selection depends on the input voltage, output voltage, and output current. A general guideline is to choose a capacitor with a voltage rating at least 1.5 times the maximum input voltage, and a capacitance value between 1-10 μF. TI recommends using a low-ESR capacitor, such as a ceramic or film capacitor, to minimize voltage ripple and ensure stable operation.
The UCC28C40 is rated for operation up to 125°C (TJ) junction temperature. However, for reliable operation, it's recommended to keep the ambient temperature below 105°C to ensure a sufficient margin for thermal management and to prevent overheating.
The UCC28C40 does not have built-in OVP. To implement OVP, you can use an external voltage supervisor, such as the TLV7031, or a dedicated OVP IC, like the TPS3808. These devices can detect overvoltage conditions and shut down the converter to prevent damage.
The output capacitor type and value depend on the output voltage, output current, and desired ripple voltage. A general guideline is to use a low-ESR capacitor, such as a ceramic or film capacitor, with a capacitance value between 10-100 μF. TI recommends using a capacitor with a voltage rating at least 1.5 times the output voltage.
UCC28C40DGKRG4 datasheet
by Texas Instruments
