The STR-W6753 is a quasi-resonant regulator specifically designed to satisfy the requirements for increased integration and reliability in switch-mode power supplies. It incorporates a primary control and drive circuit with an avalanche-rated power MOSFET. The regulator exhibits only low-level high-frequency EMI noise because of soft switching of the MOSFET close to ground (bottom point). A bottom-skip function minimizes an increase of operational frequency during light loads to improve system efficiency over the entire load range.

FEATURES AND BENEFITS

■ Rugged 650 V Avalanche-Rated MOSFET

Simplified Surge Absorption

No VDSS Derating Required

■ 1.7 Ω Maximum rDS(on)

■ Two Operational Modes by Automatic Switching:

Quasi-Resonant Mode for Normal Operation

Burst Mode for Standby Operation or Light Loads

■ Automatic or Manually Triggered Burst Standby

Input Power <0.1 W at No Load

■ Low Operating Current (6 mA typ)

■ Auto-Bias Function

Stable Burst Operation Without Generating Interference

■ Internal Off-Timer Circuit

■ Built-In Constant-Voltage Drive

■ Multiple Protections:

Pulse-by-Pulse Overcurrent Protection

Overload Protection with Auto Recovery

Latching Overvoltage Protection

Undervoltage Lockout with Hysteresis

■ RoHS Compliant