DESCRIPTION

· The UCC35701/UCC35702 family is designed for isolated switching power supplies with primary side control.
· Suitable for off-line applications and DC/DC converter designs in distributed power systems or telecom power sources.
· Features low startup current and efficient off-line starting, with output drive capable of switching power MOSFETs over 500kHz.
· Includes voltage feed forward compensation, volt-second clamp, and maximum duty cycle limit.
· Provides fault protection with pulse-by-pulse current limiting and latch-off after programmable repetitive faults.
· Available in 14-pin SOIC, PDIP, TSSOP, and CDIP packages.

FEATURES

· Operates up to 700kHz with an integrated oscillator.
· Voltage feed forward compensation for fast response to input voltage changes.
· Accurate duty cycle limit and volt-second clamp.
· Optocoupler interface and fault counting shutdown.
· Fault latch off or automatic shutdown with soft stop.
· Optimized for synchronous rectification with 1A peak gate drive output.
· Low startup and operating current.

APPLICATIONS

· Isolated switching power supplies.
· Off-line power supplies.
· DC/DC converters in distributed power systems.
· Telecom power sources.