Having problem with your switching power supply design? Or just curious on common switching power supply failures. Here’s a good resource from Micrel on troubleshooting power supplies.
This application note provides insight on troubleshooting andtaking measurements in switching power supplies. Specificmeasurements include output ripple, line and load regulation,efficiency, and transient response. Troubleshooting andmeasurement of flyback and forward converter transformersare also covered.Common measurement mistakes are also demonstrated,including using uncompensated scope probes. The final topicis an in-depth example of troubleshooting an off-line flybackpower supply. Off-line flyback topologies involve all dc-dcconverter circuit blocks, plus the ac front end, thus cover mosttroubleshooting problems.