STMicroelectronics provides a recommended PCB layout in the application note AN2345, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure reliable operation.
The input capacitor values depend on the input voltage, output voltage, and switching frequency. A general guideline is to use a minimum of 10uF ceramic capacitors with a voltage rating of at least 1.5 times the input voltage. However, it's recommended to consult the application note AN2345 and perform simulations to determine the optimal capacitor values for your specific design.
The maximum allowed voltage drop across the internal FETs is not explicitly stated in the datasheet. However, according to STMicroelectronics' support, the recommended maximum voltage drop is around 1.5V to ensure reliable operation and minimize power losses.
The PM6685TR is rated for operation up to 150°C, but it's essential to consider the derating curves and thermal management guidelines provided in the datasheet and application note AN2345 to ensure reliable operation in high-temperature environments.
STMicroelectronics provides a troubleshooting guide in the application note AN2345, which covers common issues, such as startup problems, oscillations, and overcurrent protection. Additionally, engineers can use oscilloscopes and logic analyzers to debug and analyze the PM6685TR's behavior.
PM6685TR datasheet
by STMicroelectronics
