A 4-layer PCB with a solid ground plane and a separate power plane is recommended. Keep the high-frequency traces short and away from the edges of the board. Use a common mode choke and a shielded inductor for the output filter.
Use the EN pin to disable the device when not in use. Ensure that the input voltage is within the recommended range, and use a low-quiescent-current LDO regulator for the VCC pin. Also, minimize the number of external components and use low-power modes when possible.
The maximum allowed voltage on the VIN pin is 30V, but it's recommended to keep it below 28V to ensure reliable operation and to prevent damage to the device.
Check the input voltage and ensure it's within the recommended range. Verify that the EN pin is properly biased and that the external components are correctly connected. Use an oscilloscope to check the switching node (SW) and the output voltage. Consult the application note and the datasheet for more troubleshooting tips.
The FDD8780 is rated for operation up to 150°C, but the maximum junction temperature (TJ) should not exceed 125°C. Ensure proper thermal design and heat sinking to prevent overheating. Consult the datasheet for thermal derating information.
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FDD8780 Overview
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