The recommended PCB layout for optimal thermal performance involves placing the DC-DC converter near a metal edge or a heat sink, and ensuring good airflow around the component. Additionally, the PCB should have a solid ground plane and a separate layer for the power plane to reduce electromagnetic interference (EMI).
To ensure reliable start-up and shutdown of the converter, it is recommended to add a soft-start circuit to limit the inrush current during start-up, and to use a voltage supervisor or a power-good signal to monitor the output voltage and prevent the converter from starting up with an invalid output voltage.
The maximum allowable capacitance on the output of the converter is typically limited by the stability of the converter's control loop. As a general rule, the output capacitance should be kept below 10uF to ensure stability, but the exact value may vary depending on the specific application and the converter's configuration.
To protect the converter from input voltage transients and surges, it is recommended to add a transient voltage suppressor (TVS) or a metal-oxide varistor (MOV) at the input of the converter, and to use a fuse or a current limiter to prevent overcurrent conditions.
The recommended input filter configuration to reduce EMI involves using a pi-filter (C-L-C) or an LC filter with a common-mode choke, and placing the filter components close to the input of the converter to minimize radiation and conducted emissions.
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