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STR-X6769

Part Number	STR-X6769
Manufacturer	Allegro MicroSystems
Description	Off-Line Quasi-Resonant Switching Regulators
Published	Mar 22, 2010
Detailed Description	STR-X6769 www.DataSheet4U.com Off-Line Quasi-Resonant Switching Regulators ▪ Quasi-resonant topology IC  Low EMI noise...
Datasheet	STR-X6769 PDF File

Overview

STR-X6769 www.
DataSheet4U.
com Off-Line Quasi-Resonant Switching Regulators ▪ 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 ▪ 800 VDSS / 0.
66 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 Features and Benefits Description The STR-X6769 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 310 W at 230 VAC and 210 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 systemlevel efficiency over the entire load range.
There are two standby functions 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 compared to Auto-Standby mode.
Continued on the next page… Package: 7-Pin TO-3P Not to scale Typical Application 28103.
30-12 ...

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