Infineon provides a recommended PCB layout in the application note AN2013-01, which includes guidelines for thermal vias, copper thickness, and component placement to ensure optimal thermal performance.
The input capacitor selection depends on the input voltage, current, and frequency. A general guideline is to choose a capacitor with a voltage rating of at least 1.5 times the maximum input voltage, and a capacitance value between 1uF to 10uF. Additionally, consider the capacitor's ESR, ESL, and ripple current rating.
The maximum allowed voltage drop across the internal FETs is not explicitly stated in the datasheet. However, as a general guideline, it's recommended to keep the voltage drop below 1V to ensure reliable operation and minimize power losses.
The BB857 is rated for operation up to 150°C junction temperature. However, it's essential to consider the derating curves and thermal management strategies to ensure reliable operation in high-temperature environments.
To troubleshoot the overcurrent protection feature, monitor the IC's current sense pin (ISENSE) and the output voltage. If the output voltage is lower than expected, check for excessive current draw, short circuits, or incorrect component values. Consult the datasheet and application notes for more detailed troubleshooting guidelines.
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