STRX6729 – Off-Line Quasi-Resonant Switching Regulators

STRX6729 Datasheet PDF learn more.

Part number : STRX6729

Functions : This is a kind of semiconductor, Off-Line Quasi-Resonant Switching Regulators.

Pin arrangement :

Package information :

Manufacturer : Sanken

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STRX6729 Datasheet PDF

The texts in the PDF file :

STR-X6729 Off-Line Quasi-Resonant Switching Regulators


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 ▪ 450 VDSS / 0.189 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 Package: 7-Pin TO-3P Not to scale


The STR-X6729 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 120 VAC 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, maximum on-time protections and avalanche-energy guaranteed MOSFET secure good system-level reliability. Continued on the next page�� [ … ]

STRX6729 PDF File

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