Off-Line Quasi-Resonant Switching Regulators

STR-X6769

2

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.

Applications include the following:

▪ Set Top Box

▪ LCD PC monitor, LCD TV

▪ Printer, Scanner

▪ SMPS power supplies

Description (continued)

All performance characteristics given are typical values for circuit or

system baseline design only and are at the nominal operating voltage and

Parameter

Symbol

Conditions

Rating

Unit

Single pulse

22

A

22

A

395

mJ

Input Voltage for Controller (MIC)

35

V

SS/OLP Terminal Voltage

–0.5 to 6.0

V

FB Terminal Inflow Current

10

mA

FB Terminal Voltage

–0.5 to 9.0

V

OCP/BD Terminal Voltage

–1.5 to 5.0

V

With infinite heatsink

46

W

Without heatsink

2.8

W

Controller (MIC) Power Dissipation

0.8

W

Operating Internal Leadframe Temperature

Recommended operation temperature, see cautions

–20 to 125

°C

Operating Ambient Temperature

–20 to 125

°C

Storage Temperature

–40 to 125

°C

Channel Temperature

150

°C

1

Refer to MOSFET ASO curve

2

3

Refer to Avalanche Energy Derating curve

4

Refer to MOSFET Ta-PD1 curve

Selection Guide

Part Number

Package

STR-X6769

TO-3P

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com