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The onsemi NCP1680 is a CRM PFC controller IC designed to drive the bridgeless totem-pole PFC topology. Featuring a topology which eliminates the diode bridge present at the input of a conventional PFC circuit, the bridgeless totem-pole PFC greatly improves power stage efficiency. https://www.futureelectronics.com/resources/featured-products/onsemi-ncp1680-crm-pfc-controller-ic