Bel Fuse provides a recommended PCB layout and land pattern in their application notes, which can be found on their website. It's essential to follow these guidelines to ensure proper thermal performance and reliability.
Proper cooling can be achieved by providing adequate airflow, using a heat sink, or incorporating a thermal interface material (TIM) between the device and the heat sink. Bel Fuse recommends a minimum of 200 LFM (linear feet per minute) airflow to maintain a junction temperature below 125°C.
Bel Fuse recommends derating the voltage by 10% to ensure reliable operation. For example, if the maximum rated voltage is 50V, the derated voltage would be 45V.
While the S558-5500-67 is rated for operation up to 125°C, Bel Fuse recommends de-rating the current and voltage at higher temperatures to ensure reliability. Consult the datasheet and application notes for specific guidance.
Start by verifying the input voltage, current, and temperature are within the recommended specifications. Check for proper PCB layout, thermal management, and component soldering. If issues persist, consult Bel Fuse's application notes and contact their technical support for further assistance.
