The recommended layout and placement for the UCC28051DG4 involves keeping the high-frequency components (such as the switching node and the bootstrap capacitor) close to the IC, and using a solid ground plane to reduce EMI. The datasheet provides a recommended layout diagram, and TI also provides a layout guide application note (SLUA623) that provides more detailed guidance.
The bootstrap capacitor value depends on the specific application requirements, such as the switching frequency, output voltage, and current. A general rule of thumb is to choose a capacitor with a value between 10nF to 100nF. TI provides a bootstrap capacitor selection guide in the datasheet, and also recommends using the WEBENCH Power Designer tool to help with component selection.
The maximum allowed voltage on the VCC pin is 18V, but it's recommended to keep it below 15V to ensure reliable operation. Exceeding the maximum voltage can cause damage to the IC.
TI provides a detailed application note (SLUA622) that covers the recommended biasing and configuration for the UCC28051DG4. The note provides guidance on setting the correct voltage levels, resistor values, and capacitor values for the specific application requirements.
The UCC28051DG4 has a maximum junction temperature of 150°C. To ensure it doesn't overheat, it's recommended to provide adequate heat sinking, such as using a thermal pad or a heat sink, and to keep the IC away from other heat sources. TI also provides thermal design guidelines in the datasheet and application notes.
UCC28051DG4 datasheet
by Texas Instruments
