A good PCB layout for the LNK6776K-TL should have a solid ground plane, keep the input and output stages separate, and use a star-configuration for the transformer connections. Refer to Power Integrations' application notes for more details.
To ensure reliable start-up and shutdown, make sure the input voltage is within the specified range, and the output voltage is properly regulated. Also, ensure the soft-start capacitor is properly sized and the undervoltage lockout (UVLO) threshold is set correctly.
Thermal design considerations include providing adequate airflow, using a heat sink if necessary, and ensuring the device is mounted on a multi-layer PCB with a solid ground plane to dissipate heat effectively.
Optimize the transformer design by selecting the correct core material, ensuring the correct turns ratio, and minimizing leakage inductance. Refer to Power Integrations' application notes and transformer design guides for more information.
EMI filtering requirements include using a common-mode choke, Y-capacitors, and X-capacitors to meet the relevant EMI standards (e.g., CISPR 22). Ensure the filter components are properly sized and placed to minimize radiation and conducted emissions.
LNK6776K-TL datasheet
by Power Integrations
