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STR-X6759N Datasheet(PDF) 1 Page - Allegro MicroSystems |
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STR-X6759N Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 11 page STR-X6759N Description The STR-X6759N 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 460 W at 230 VAC and 250 W at universal 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. Astandby mode is executed by clamping the secondary output. In general applications, standby mode reduces input power. The soft-start mode minimizes surge voltage and reduces power stress to the MOSFET and to the secondary rectifying diodes during the start-up sequence. Various protections such as overvoltage, overload, overcurrent, maximumon-timeprotectionsandavalanche-energyguaranteed MOSFET secure good system-level reliability. 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 ▪ 650 VDSS / 0.385 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 Off-Line Quasi-Resonant Switching Regulators Typical Application Not to scale Package: 7-Pin TO-3P Continued on the next page… 28103.30-7 |
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