STRW6753-Universal-Input/58 W Off-Line Quasi-Resonant Flyback Switching Regulator

Type:Switching Regulator 1.Two Operational Modes by Automatic Switching 2.Low Operating Current 3.Multiple Protections

Switching Regulator Description

The STR-W6753 is a quasi-resonant regulator specifically designedto satisfy the requirements for increased integration and reliability inswitch-mode power supplies.  It incorporates a primary control and drivecircuit with an avalanche-rated power MOSFET.  The regulator exhibitsonly low-level high-frequency EMI noise because of soft switching ofthe MOSFET close to ground (bottom point).  A bottom-skip functionminimizes an increase of operational frequency during light loads toimprove system efficiency over the entire load range.Covering the power range from below 120 watts for a 230 VACinput, or 58 watts for a universal input (85 to 264 VAC), this device canbe used in a range of applications, from DVD and VCR players to acadapters for cellular phones and digital cameras.  An auto-standbyfunction, which is internally triggered  by sensing on time, reducespower consumption at light load.  An externally triggered standby modereduces the input power further.  Multiple protections, including theavalanche-energy-guaranteed MOSFET, provide high reliability ofsystem design.  Devices with an increased output power rating are theSTR-W6754 and STR-W6756.Cycle-by-cycle current limiting, undervoltage lockout with hyster-esis, and overvoltage protection protect the power supply during thenormal overload and fault conditions.  Overvoltage protection is latchedafter a short delay.  The latch may be reset by cycling the input supply.Low start-up current and a low-power standby mode selected from thesecondary circuit completes a comprehensive suite of features.  TheSTR-W6753 is provided in a fully molded TO-220-style flange-mounted, high power, isolated plastic package.

STRW6753-Universal-Input/58 W Off-Line Quasi-Resonant Flyback Switching Regulator