STR-X6737 Просмотр технического описания (PDF) - Allegro MicroSystems

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STR-X6737

Off-Line Quasi-Resonant Switching Regulators

Allegro MicroSystems 

STR-X6737

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

▪ Auto-Standby mode  Lowers input power at very light

output load condition

▪ Avalanche-guaranteed MOSFET  Improves system-level

reliability and does not require VDSS derating

▪ 500 VDSS / 0.36 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

Description

The STR-X6737 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 280 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.

There are two standby modes available to reduce the input power

under very light load conditions. The first is Auto-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 page…

Typical Application

28103.30-9

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