STR-W6735

STR-W6735 Quasi-Resonant Topology Primary Switching Regulators Features and Benefits ▪ Quasi-resonant topology IC ⇒ Low EMI noise and soft switching ▪ Bottom-skip operation ⇒ Improved system efficiency over the entire output load by avoiding increase of switching frequency ▪ Standby burst mode operation ⇒ Lowers input power at very light output load condition ▪ Avalanche-guaranteed MOSFET ⇒ Improves systemlevel reliability and does not require VDSS derating ▪ 500 V / 0.57 Ω, 160 W (120 Vac input) Description The STR-W6735 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 operation 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-220, which contains the controller chip (MIC) and MOSFET, enabling output power up to 160 W with a 120 Vac input. The bottom-skip function skips the first bottom of VDS and turns on the MOSFET at the second bottom point, to minimize an increase of operational frequency at light output load, improving system-level efficiency over the entire load range. Continued on the next page… Package: 6-pin TO-220 There are two standby functions available to reduce the input power under very light load conditions. The first is an auto-burst mode operation that is in...