STR-A6251 ALLEGRO [Allegro MicroSystems], STR-A6251 Datasheet

STR-A6251

Manufacturer Part Number

STR-A6251

Description

Universal-Input/15 W 50 kHz Flyback Switching Regulators

Manufacturer

ALLEGRO [Allegro MicroSystems]

Datasheet

1.STR-A6251.pdf (7 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

STR-A6251

Manufacturer:

SANKEN

Quantity:

5 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

STR-A6251

Manufacturer:

SANKEN

Quantity:

20 000

Company:

H&T Electronics

Part Number:

STR-A6251

Quantity:

25 800

Company:

H&T Electronics

Part Number:

STR-A6251

Quantity:

7 816

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

STR-A6251(DIP7)

Manufacturer:

SANYO

Quantity:

629

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

STR-A6251M

Manufacturer:

SANKEN

Quantity:

5 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

STR-A6251M

Manufacturer:

SANKEN

Quantity:

20 000

Company:

H&T Electronics

Part Number:

STR-A6251M

Quantity:

25 800

Current page: 1 of 7
Download datasheet (381Kb)

Control Supply Voltage, V

Drain-Source Voltage, V

Drain Switching Current, I

Peak Drain Switching Current, I

Single-Pulse Avalanche Energy, E

S/OCP Voltage Range,

FB/CC/OLP Voltage Range,

FM Voltage Range,

Package Power Dissipation, P

MOSFET Channel Temp., T

Internal Frame Temp., T

Storage Temperature Range,

* Drain switching current is limited by tem-

perature (page 2) and safe operating area

(page 4).

ABSOLUTE MAXIMUM RATINGS

STR-A6251 . . . . . . . . . . . . . . 2.5 A*

STR-A6252 . . . . . . . . . . . . . . 3.0 A*

STR-A6251 . . . . . . . . . . . . . . . 2.5 A

STR-A6252 . . . . . . . . . . . . . . . 3.0 A

STR-A6251 . . . . . . . . . . . . . . 72 mJ

STR-A6252 . . . . . . . . . . . . . 123 mJ

control (V

MOSFET (V

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

OCP

FB/OLP

. . . . . . . . . . . .

. . . . . . . . . . . . . –0.3 V to +6 V

. . . . . . . . . . . . –0.3 V to +6 V

. . . . . . . . . . –0.3 V to +12 V

at T

DSS

× I

CC(ON)

= +25°C

× I

) . . . . . . 1.35 W

-40°C to +125°C

) . . . . . 0.15 W

DSS . . . . . .

. . . . +125°C

. . . . 36 V

. +150°C

650 V

STR-A6251

STR-A6252

±5% frequency jittering for minimum EMI) 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-A6252

features higher allowable switching current and lower on-resistance.

The STR-A6251 is also available for 67 kHz operation.

230 VAC input, or to 15 or 20 watts for a universal (85 to 264 VAC)

input, these devices can be used in a wide range of applications, from

DVD players and VCR player/recorders to ac adapters for cellular

phones and digital cameras. An auto-burst standby function reduces

power consumption at light load, while multiple protections, including

the avalanche-energy guaranteed MOSFET, provide high reliability of

system design.

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 with pin 6 removed.

Always order by complete part number, e.g., STR-A6251 .

from Allegro MicroSystems

Sanken Power Devices

50 kHz PWM with ±5% Frequency Jittering

Cost Reduction of EMI Noise Filtering

Rugged 650 V Avalanche-Rated MOSFET

Simplified Surge Absorption

No V

Choice of

Auto-Burst Mode for Stand-By Operation or Light Loads

Less Transformer Audible Noise

Built-In Leading Edge Blanking

Soft Start and Low Start-Up Current

Start-Up Circuit Disabled in Operation

Low Operating Current (4 mA max)

The STR-A6251 and STR-A6252 are 50 kHz PWM topology (with

Covering the power range from below 21 watts or 24 watts for a

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

Flyback Switching Regulators

Universal-Input/15 W 50 kHz

DSS

Derating Required

DS(on)

(2.8 Ω or 3.95 Ω maximum)

FEATURES

AND

BENEFITS

AND

continued

Related parts for STR-A6251

STR-A6251 Summary of contents

Page 1

... Control Supply Voltage Drain-Source Voltage, V 650 V DSS . . . . . . Drain Switching Current STR-A6251 . . . . . . . . . . . . . . 2.5 A* STR-A6252 . . . . . . . . . . . . . . 3.0 A* Peak Drain Switching Current STR-A6251 . . . . . . . . . . . . . . . 2.5 A STR-A6252 . . . . . . . . . . . . . . . 3.0 A Single-Pulse Avalanche Energy STR-A6251 . . . . . . . . . . . . . . 72 mJ STR-A6252 . . . . . . . . . . . . . 123 mJ S/OCP Voltage Range –0 OCP FB/CC/OLP Voltage Range –0 +12 V ...

Page 2

... STR-A6251 and STR-A6252 Universal-Input/ kHz Flyback Switching Regulators 2 FUNCTIONAL BLOCK DIAGRAM FEATURES Automatic Burst Stand-By (intermittent operation) Input Power <0 Load Auto-Bias Function Stable Burst Operation Without Generating Interference Internal Off-Timer Circuit Built-In Constant-Voltage/Constant Current Multiple Protections: Pulse-by-Pulse Overcurrent Protection (OCP) ...

Page 3

... SET(CC RES(CC startup 35 CC(OVP =35.2 CC CC( =35 θ JF STR-A6251 and STR-A6252 Universal-Input/ kHz Ratings Min Typ Max 650 - - - - 300 = 250 12.9 14 3.0 5.0 7 ...

Page 4

... STR-A6251 and STR-A6252 Universal-Input/ kHz Flyback Switching Regulators STR-A6251 Avalanche energy is measured mH 2 Operating Ambient Temperature ....... -20°C to +100°C Operating Junction Temperature ....... -20°C to +125°C Maximum Frame Temperature ........................ +115°C For the availability of parts meeting -40°C requirements, contact Allegro’ ...

Page 5

... Precautions must be taken to prevent accidental contact with power-line potentials. Do not connect grounded test equipment. The use of an isolation transformer is recommended during circuit development and breadboarding. www.allegromicro.com STR-A6251 and STR-A6252 Universal-Input/ kHz Flyback Switching Regulators STR-A6251 STR-A6252 ...

Page 6

... STR-A6251 and STR-A6252 Universal-Input/ kHz Flyback Switching Regulators Typical Application NOTE: The start-up performance of the IC can only be guaranteed for values of C2 greater than 22 µF. This value is required to keep the internal supply voltage within regulation during IC initialization. The products described herein are manufactured in Japan by Sanken Electric Co ...

Page 7

... STR-A6251 and STR-A6252 Universal-Input/ kHz Flyback Switching Regulators PACKAGE DIMENSIONS Dimensions in Inches Dimensions in Millimeters (controlling dimensions) Terminal Finish: Pure Sn, 2 Product Weight: Approx. 0.51 g. Frame temperature For more efficient heat radiation, connect a broad PCB pattern at pins 7 and 8. (for reference only) nd level interconnect category (e3) ...

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