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STR-A6132

120 V/12 or 16 W Flyback Switching Regulators

Allegro MicroSystems 

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ABSOLUTE MAXIMUM RATINGS

at TA = +25°C

Control Supply Voltage, VCC . . . . 35 V

Drain-Source Voltage, VDSS . . . . . . 500 V

Drain Switching Current, ID

STR-A6131 . . . . . . . . . . . . . . 3.2 A*

STR-A6132 . . . . . . . . . . . . . . 4.0 A*

Peak Drain Switching Current, IDM

STR-A6131 . . . . . . . . . . . . . . . 3.2 A

STR-A6132 . . . . . . . . . . . . . . . 4.0 A

Single-Pulse Avalanche Energy, EAS

STR-A6131 . . . . . . . . . . . . . . 32 mJ

STR-A6132 . . . . . . . . . . . . . . 78 mJ

Start-Up-Pin Voltage Range,

Vstartup . . . . . . . . . –0.3 V to +600 V

OCP Voltage Range,

VOCP . . . . . . . . . . . . –0.5 V to +6 V

FB/OLP Voltage Range,

VFB/OLP . . . . . . . . . . –0.5 V to +10 V

Package Power Dissipation, PD

control (VCC × ICC(ON)) . . . . . 0.15 W

MOSFET (VDSS × ID) . . . . . . 1.35 W

total . . . . . . . . . . . . . . . . . . . . 1.5 W

MOSFET Channel Temp., TJ . +150°C

Internal Frame Temp., TF . . . . +125°C

Operating Temperature Range,

TA . . . . . . . . . . . -20°C to +125°C†

Storage Temperature Range,

TS . . . . . . . . . . . . -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.

STR-A6131 AND

STR-A6132

120 V/12 or 16 W

Flyback Switching Regulators

The STR-A6131 and STR-A6132 are PRC topology (fixed off-time)

regulators specifically designed to satisfy the requirements for increased

integration and reliability in flyback converters. They incorporate a

primary control and drive circuit with avalanche-rated power

MOSFETs. The STR-A6132 features higher switching current and

avalanche-energy ratings and lower on-resistance.

Covering the power range from below 12 watts to 16 watts for a 120

VAC input, these devices 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 guaran-

teed 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. Both devices are provided in an 8-pin

mini-DIP plastic package.

FEATURES AND BENEFITS

■ Rugged 500 V Avalanche-Rated MOSFET

Simplified Surge Absorption

No VDSS Derating Required

■ Choice of rDS(on) (2.62 Ω or 3.95 Ω maximum)

■ 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-A6131 .

Sanken Power Devices

from Allegro MicroSystems

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