Insulated-gate-transistor drivers for soft-switching converters, synchronous rectifiers, and ZVS/ZCS active snubbers

A new family of ICs for driving insulated-gate transistors is introduced. Three members of the family are designed for soft-switching converters and converters with synchronous rectifiers; two members are designed for converters with zero-voltage-switching or zero-current switching active snubbers. Due to their low stand-by current and a unique first-pulse wake-up feature, all ICs are suitable for operation in self-biased power supplies. The ICs also have a dual-function pin for high-speed cycle-by-cycle current limiting or for selecting a low-current stand-by state. The authors give functional descriptions, block schematics with waveforms, and application examples