A good PCB layout for the FDD8878 involves keeping the high-current paths short and wide, using a solid ground plane, and placing the input and output capacitors close to the device. Additionally, it's recommended to use a shielded inductor and to keep the switching node (SW) away from sensitive analog circuits.
To optimize the FDD8878 for low standby power consumption, ensure that the EN pin is properly biased to turn off the device when not in use. Also, select a low-ESR input capacitor and a high-efficiency inductor to minimize power losses. Furthermore, consider using a low-voltage, low-power mode for the controller IC.
The maximum allowed voltage on the VIN pin of the FDD8878 is 25V. Exceeding this voltage may damage the device. It's essential to ensure that the input voltage is within the recommended operating range to ensure reliable operation.
To troubleshoot the FDD8878 if it's not switching properly, first check the input voltage and ensure it's within the recommended range. Verify that the EN pin is properly biased and that the oscillator is running correctly. Also, check for any signs of overheating, and ensure that the output voltage is within the expected range. If the issue persists, consult the onsemi application note for further guidance.
The FDD8878 is rated for operation up to 150°C junction temperature. However, it's essential to ensure that the device is properly heatsinked and that the thermal design is adequate to prevent overheating. Consult the onsemi datasheet and application notes for guidance on thermal design and high-temperature operation.
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FDD8878 Overview
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