STRX6737 Datasheet | Sanken

STR-X6737 Off-Line Quasi-Resonant Switching Regulators 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 - Auto-Standby mode  Lowers input power at very light output load condition - Avalanche-guaranteed MOSFET  Improves system-level reliability and does not require VDSS derating - 500 VDSS / 0.36 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 Package: 7-Pin TO-3P Description The STR-X6737 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. The package is a fully molded TO-3P, which contains the controller chip (MIC) and MOSFET, enabling output power up to 280 W at 120 VAC input. The bottom-skip mode skips the first bottom of VDS and turns on the MOSFET at the second bottom point, to minimize an increase of operating frequency at light output load, improving system-level efficiency over the entire load range. There are two standby modes available to reduce the input power under very light load conditions. The first is Auto-Standby mode, which is internally triggered by periodic sensing, and the other is a manual standby mode, which is executed by clamping the secondary output. In general applications, the manual standby mode reduces the input power further pared to Auto-Standby mode. Not to scale Continued on the next page… Typical Application 28103.30-9 STR-X6737 Off-Line Quasi-Resonant Switching...