Universal-Input/20 W

Flyback Switching Regulator

STR-A6153E

Sanken Power Devices

from Allegro MicroSystems

Switching

Regulators

ABSOLUTE MAXIMUM RATINGS

Peak Drain Switching Current,

Single-Pulse Avalanche Energy,

Start-Up-Pin Voltage Range,

OCP Voltage Range,

FB/OLP Voltage Range,

total . . . . . . . . . . . . . . . . . . . 2.27 W

Operating Temperature Range,

-20°C to +125°C†

Storage Temperature Range,

-40°C to +125°C

* Drain switching current is limited by tem-

perature (page 2) and safe operating area

(page 4).

†For the availability of parts meeting -40°C

requirements, contact Allegro’s Sales Represen-

tative.

The STR-A6153E is a PRC topology (fixed off-time) regulator

specifically designed to satisfy the requirements for increased integration

and reliability in flyback converters. It incorporates a primary control

and drive circuit with avalanche-rated power MOSFET. The STR-

A6153E features high switching current and avalanche-energy ratings

and low on-resistance.

Covering the power range from below 24 watts for a 230 VAC

input, or 20 watts for a universal (85 to 264 VAC) input, this device can

be used in a range of applications, from DVD and VCR players to ac

adapters for cellular phones and digital cameras. An auto-standby

function reduces power consumption at light load, while multiple

protections, including the avalanche-energy guaranteed MOSFET,

provide high reliability of system design.

Cycle-by-cycle current limiting, undervoltage lockout with hyster-

esis, overvoltage protection, and thermal shutdown protect the power

supply during the normal overload and fault conditions. Overvoltage

protection and thermal shutdown are latched after a short delay. The

latch may be reset by cycling the input supply. Low start-up current and

a low-power standby mode selected from the secondary circuit completes

a comprehensive suite of features. The STR-A6153E is provided in an

8-pin mini-DIP plastic package.

■ Rugged 650 V Avalanche-Rated MOSFET

Simplified Surge Absorption

■ 1.9

DS(on)

■ Two Operational Modes by Automatic Switching:

PRC Mode for Normal Operation

Burst Mode for Stand-By Operation or Light Loads

■ Built-In Leading Edge Blanking

■ Low Start-Up Current

Start-Up Circuit Disabled in Operation

■ Low Operating Current (1.5 mA typ)

■ Automatic Burst Stand-By (intermittent operation)

Input Power <0.1 W at No Load

— continued

Always order by complete part number, e.g., STR-A6153E .