STR-X6769_V Datasheet, PDF(1/9 Page) Allegro MicroSystems – Off-Line Quasi-Resonant Switching Regulators

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STR-X6769_V Datasheet, PDF (1/9 Pages) Allegro MicroSystems – Off-Line Quasi-Resonant Switching Regulators

STR-X6769

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 Auto-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 800 VDSS / 0.66 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

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 system-

level efficiency over the entire load range.

There are two standby functions available to reduce the input

power under very light load conditions.The first isAuto-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.

Not to scale

Continued on the next pageâ¦

Typical Application

STR-X6769

SANKEN ELECTRIC CO., LTD.

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

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