STR-A6251M ALLEGRO [Allegro MicroSystems], STR-A6251M Datasheet

STR-A6251M

Manufacturer Part Number

STR-A6251M

Description

Universal-Input/15 W 67 kHz Flyback Switching Regulator

Manufacturer

ALLEGRO [Allegro MicroSystems]

Datasheet

1.STR-A6251M.pdf (7 pages)

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Bonase Electronics (HK) Co., Limited

Part Number:

STR-A6251M

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SANKEN

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5 000

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Meier Automation Equipment Co., Limited

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STR-A6251M

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STR-A6251M

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Current page: 1 of 7
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Control Supply Voltage, V

Drain-Source Voltage, V

Drain Switching Current, I

Peak Drain Switching Current,

Single-Pulse Avalanche Energy,

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

control (V

MOSFET (V

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

OCP

FB/OLP

. . . . . . . . . . . . . . . . . . . . . . 2.5 A

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

. . . . . . . . . . . . . . . . . . . . 72 mJ

. . . . . . . . . . . . . –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

. . . . 2.5 A*

. . . . 36 V

. +150°C

650 V

67 kHz Flyback Switching Regulator

STR-A6251M

quency jittering for minimum EMI) regulator specifically designed to

satisfy the requirements for increased integration and reliability in

flyback converters. It incorporates a primary control and drive circuit

with an avalanche-rated power MOSFET. This is a higher-frequency

version of the STR-A6251.

input, or to 15 watts for a universal (85 to 264 VAC) input, this device

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. It is provided in an 8-pin mini-DIP

plastic package with pin 6 removed.

Always order by complete part number, e.g., STR-A6251M .

from Allegro MicroSystems

Sanken Power Devices

67 kHz PWM with ±5% Frequency Jittering

Cost Reduction of EMI Noise Filtering

Rugged 650 V Avalanche-Rated MOSFET

Simplified Surge Absorption

No V

Low

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)

Automatic Burst Stand-By (intermittent operation)

Input Power <0.1 W at No Load

The STR-A6251M is a 67 kHz PWM topology (with ±5% fre-

Covering the power range from below 21 watts for a 230 VAC

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

DSS

DS(on)

Derating Required

(3.95 Ω maximum)

FEATURES

Universal-Input/15 W

AND

BENEFITS

continued

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STR-A6251M Summary of contents

Page 1

... STR-A6251M Universal-Input/ kHz Flyback Switching Regulator The STR-A6251M kHz PWM topology (with ±5% fre- quency jittering for minimum EMI) regulator specifically designed to satisfy the requirements for increased integration and reliability in flyback converters. It incorporates a primary control and drive circuit with an avalanche-rated power MOSFET ...

Page 2

... STR-A6251M Universal-Input/ kHz Flyback Switching Regulator 2 FUNCTIONAL BLOCK DIAGRAM FEATURES 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) Overload Protection (OLP) with Auto Restart Latching Overvoltage Protection (OVP) ...

Page 3

... OLP FB(MAX SET(CC RES(CC startup 35 CC(OVP =35.2 CC CC( =35 θ JF STR-A6251M Universal-Input/13 W Ratings Min Typ Max 650 - - - - 300 - - 3. 250 12.9 14 4.0 6 4.0 4.5 5.0 3.2 3.6 4.0 -7.7 -11.0 -15.4 7.7 11.0 15.4 ...

Page 4

... STR-A6251M Universal-Input/ kHz Flyback Switching Regulator Avalanche energy is measured mH 2 MOSFET TYPICAL CHARACTERISTICS Recommended Operating Conditions 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 Universal-Input/ kHz Flyback Switching Regulator STR-A6251M 5 ...

Page 6

... STR-A6251M Universal-Input/ kHz Flyback Switching Regulator 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

... 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. STR-A6251M Universal-Input/13 W (for reference only) nd level interconnect category (e3 measured at the root of pin 3. EI 26EI 7 ...

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