UCC3580EVM Flyback Converters, Active Clamp vs. Hard-Switched. This EVM is originally configured as an active-clamp flyback converter. Instructions and parts list are included in order to reconfigure the UCC3580EVM as a hard-swtiched flyback converter. Both configuations use the UCC3580 PWM controller. The active clamp configuration operates noticeably more efficiently than the hard switched configuration. Most of the efficiency differences will be seen in the primary side components.