UCC35705P [Unitrode]

The UCC35705 and UCC35706 devices are 8-pin voltage mode primary side controllers with fast over-current protection. They feature a high speed oscillator with integrated feed-forward compensation for improved converter performance. A typical current sense to output delay time of 25 ns provides fast response to overload conditions. The IC also provides an accurate programmable maximum duty cycle clamp for increased protection which can also be disabled for the oscillator to run at maximum possible duty cycle. Two UVLO options are offered: UCC35705 with lower turn-on voltage for dc-to-dc converters, and UCC35706 with higher turn-on voltage and wider UVLO range for offline applications. The family is offered in 8-pin MSOP, SOIC, and PDIP packages.