iW610 Digital Synchronous Rectifier Controllers Renesas Electronics iW610 Digital Synchronous Rectifier Controllers are compatible with all Renesas AC/DC converters and various flyback converter topologies. The compatible topologies include quasi-resonant (QR), Zero Voltage Switching (ZVS), and active clamp flybacks (ACF) operating in both Discontinuous Conduction Mode (DCM) and Continuous Conduction Mode (CCM). The Renesas Electronics iW610 supports resonant LLC converters. The devices can operate in low- or high-side configurations without requiring an external auxiliary winding.