Isolated DC/DC Telecom Power Module Based on UCD3138 Digital Controller

The PMP8877 is a full-featured 1/8 brick isolated DC/DC telecom power module based on the UCD3138 digital power controller. The reference design uses secondary-side control and a hard-switched full-bridge power topology to deliver 12V/180W output power while operating from a wide range of 36V-72V input sources. Highlights of the reference design include: 94% peak efficiency, fast input voltage feed-forward response to input voltage surges, constant current/constant supply overload protection, pre-biased startup, current sharing control for parallel module applications, and PMBUS support for communication with peer controllers. The bias power block uses the UCC25230, while the gate drivers used in the design include the UCC27524 for driving the SR MOSFET and the UCC27211 for driving the primary-side half-bridge MOSFET. Other components include the ISO7240 for sending signals across the isolation barrier.