The recommended PCB layout for optimal thermal performance involves placing the DC-DC converter near the input capacitors, using a solid ground plane, and keeping the output capacitors close to the output pins. Additionally, it's recommended to use a thermal relief pattern on the PCB to improve heat dissipation.
To ensure reliable start-up and shutdown of the converter, it's recommended to add a soft-start circuit to limit the inrush current, and to use a voltage supervisor or reset IC to monitor the output voltage and reset the system if it falls out of range.
The maximum allowable capacitance on the output depends on the specific application and the desired stability of the converter. As a general rule, it's recommended to keep the output capacitance below 10uF to ensure stability and prevent oscillations.
The CFM61S120-E is rated for operation up to 85°C, but it can be derated for higher temperatures. However, it's recommended to consult with the manufacturer or a thermal expert to determine the maximum allowable temperature and to ensure that the converter is properly cooled.
To troubleshoot common issues such as output voltage droop or oscillations, it's recommended to check the input voltage, output load, and PCB layout for any anomalies. Additionally, using an oscilloscope to monitor the output voltage and current can help identify the root cause of the issue.
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