A secondary side controller for an AC-DC converter and method for operating the same are provided. Generally, the controller includes a single synchronous rectifier sense (SR-SNS) pin coupled to a drain of a SR on a secondary of a transformer to sense a voltage (VSRD). In feed-forward (FF) mode VSRD is a sum of a voltage (VIN) on a primary divided by a turn-ratio (N) of the transformer and an output bus voltage (VBUS). A voltage-to-current (V2I) converter coupled to the SR-SNS pin and to the output bus removes VBUS from VSRD. A sample and hold (S/H) module coupled to the SR-SNS pin samples a voltage (VSAMP) including information on VIN/N. A VIN/N V2I converter coupled to the S/H module converts VSAMP to a feed-forward current (IFF), and a cancellation and signal module coupled thereto extracts information on VIN from IFF and generates signals to control the AC-DC converter.