STR-X6759N Просмотр технического описания (PDF) - Allegro MicroSystems

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STR-X6759N

Off-Line Quasi-Resonant Switching Regulators

Allegro MicroSystems 

STR-X6759N

Off-Line Quasi-Resonant Switching Regulators

Features 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

▪ 650 VDSS / 0.385 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

Description

The STR-X6759N 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 230 VAC and 250 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.

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 page…

Typical Application

28103.30-7

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