STR-X6729 Datasheet, PDF(1/9 Page) Allegro MicroSystems – Off-Line Quasi-Resonant Switching Regulators

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STR-X6729 Datasheet, PDF (1/9 Pages) Allegro MicroSystems – Off-Line Quasi-Resonant Switching Regulators

STR-X6729

Off-Line Quasi-Resonant Switching Regulators

Features and Benefits

âª Quasi-resonant topology IC ï Low EMI noise and soft

switching

âª Bottom-skip mode ï Improved system efficiency over

the entire output load by avoiding increase of switching

frequency

âª Standby mode ï Lowers input power at very light output

load condition

âª Avalanche-guaranteed MOSFET ï Improves system-level

reliability and does not require VDSS derating

âª 450 VDSS / 0.189 Î© RDS(on)

âª Various protections ï Improved system-level reliability

â« Pulse-by-pulse drain overcurrent limiting

â« Overvoltage Protection (bias winding voltage sensing),

with latch

â« Overload Protection with latch

â« Maximum on-time limit

Package: 7-Pin TO-3P

Not to scale

Description

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.

A standby 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 pageâ¦

Typical Application

STRX6729DS

SANKEN ELECTRIC CO., LTD.

http://www.sanken-ele.co.jp

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