Description

The STR-X6729 is a quasi-resonant topology IC designed for SMPS applications. It shows lower EMI noise characteristics than conventional PWM solutions, especially at greater than 2 MHz. It also provides a soft-switching mode to turn on the internal MOSFET at close to zero voltage (VDS bottom point) by use of the resonant characteristic of primary inductance and a resonant capacitor.

Features and Benefits

▪ Quasi-resonant topology IC => Low EMI noise and soft switching

▪ Bottom-skip mode => Improved system efficiency over the entire output load by avoiding increase of switching frequency

▪ Standby mode => Lowers input power at very light output load condition

▪ Avalanche-guaranteed MOSFET => Improves system-level reliability and does not require VDSS derating

▪ 450 VDSS / 0.189 Ω RDS(on)

▪ Various protections => Improved system-level reliability

▫ Pulse-by-pulse drain overcurrent limiting

▫ Overvoltage Protection (bias winding voltage sensing), with latch

▫ Overload Protection with latch

▫ Maximum on-time limit

Applications include the following:

▪ Set Top Box

▪ LCD PC monitor, LCD TV

▪ Printer, Scanner

▪ SMPS power supplies