A　resonant　capacitor　voltage　feedback　control　method　for　an　asymmetrical　half-bridge　flyback　converter　is　proposed　in　this　paper.　It　can　reduce　the　number　of　devices,　save　the　costs　and　improve　the　efficiency　in　low　power　supply　applications.　By　using　this　control　method,　the　control　structure　of　the　isolated　single-input　multi-output　converter　is　simplified.　Moreover,　there　is　no　compensating　circuit　for　the　designed　constant　on-time　controller.　Since　the　feedback　voltage　signal　for　the　control　strategy　is　taken　from　the　primary　side　resonant　capacitor,　it　has　large　voltage　ripple　resulting　in　the　pulse　bursting　phenomenon　of　constant　on-time　control,　which　makes　the　converter　unstable.　To　restrain　the　pulse　bursting　phenomenon　caused　by　the　large　voltage　ripple,　the　constant　on-time　control　with　ripple　compensation　is　used　to　suppress　the　feedback　signal　voltage　ripple.　Thus,　the　stability　of　the　converter　is　guaranteed.　Finally,　the　experimental　prototype　has　verified　the　theoretical　analysis　and　designing　method.　©　2017,　The　editorial　office　of　Transaction　of　China　Electrotechnical　Society.　All　right　reserved.