UCC29900 Integral Cycle Contro

TI has developed a fully functioning reference design using the UCC29900 ICC controller, full details of which are available on request. This design is for a universal input, single output, 90-W PSU intended for laptop adapter applications. It comprises a buck PFC stage converting the incoming line power to a nominal 84 V. A half-bridge power stage is used to convert this intermediate voltage to an isolated 19.25-V nominal output. In addition to the UCC29900 ICC controller the design uses synchronous rectifiers to give maximum efficiency levels. The
following paragraphs give some details on how the features of the UCC29900 are used to maximum effect in this reference design. Additional application guidelines for the UCC29900 are available on request.