Texas Instruments recommends a compact layout with short traces, and placing the IC close to the DC-DC converter. Additionally, a solid ground plane and a separate analog ground plane can help reduce noise and EMI. Refer to the TI application note SLUA144 for more details.
The values of the external resistors and capacitors depend on the specific application and the desired output voltage. TI provides a calculator tool, the UCC38xx Calculator, which can help determine the optimal values. Additionally, the datasheet provides guidelines and equations for selecting the components.
The UCC3817AD can handle input voltages up to 18V, but it's recommended to keep the input voltage below 15V to ensure reliable operation and to prevent damage to the IC.
The UCC3817AD is rated for operation up to 125°C, but it's recommended to derate the output current and voltage at high temperatures to ensure reliable operation. Refer to the datasheet for more information on thermal derating.
TI recommends checking the layout and placement of the IC and the external components, ensuring that the input voltage and current are within the recommended range, and verifying that the output voltage is within the desired range. Additionally, using an oscilloscope to monitor the output voltage and current can help identify the root cause of the issue.
UCC3817AD datasheet
by Texas Instruments
