8-pin high-performance resonant mode LLC controller

The UCC25600 high performance,

resonant mode controller is designed for dc-to-dc applications using resonant

topologies, especially the LLC half-bridge resonant converter. This highly

integrated controller implements frequency modulation control and complete system

functions in only an 8-pin package. Switching to the UCC25600 will greatly simplify

the system design and layout, and improve time to market, all at a price point lower

than competitive 16-pin device offerings.

The internal oscillator supports the

switching frequencies from 40 kHz to 350 kHz. This high-accuracy oscillator realizes

the minimum switching frequency limiting with 4% tolerance, allowing the designer to

avoid over-design of the power stage and, thus, further reducing overall system

cost. The programmable dead time enables zero-voltage switching with minimum

magnetizing current. This maximizes system efficiency across a variety of

applications. The programmable soft-start timer maximizes design flexibility

demanded by the varied requirements of end equipment using a half-bridge topology.

By incorporating a 0.4-A source and 0.8-A sink driving capability, a low cost,

reliable gate driver transformer is a real option.

The UCC25600 delivers complete system

protection functions including overcurrent, UVLO, bias supply OVP, and

overtemperature protection.