str-a6251md Allegro MicroSystems, Inc., str-a6251md Datasheet

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str-a6251md

Manufacturer Part Number
str-a6251md
Description
Universal-input / 15 W 67 Khz Flyback Switching Regulator | Str-a6251md
Manufacturer
Allegro MicroSystems, Inc.
Datasheet
1.STR-A6251MD.pdf (8 pages)
Features and Benefits
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Continued on the next page…
Package: 8-pin DIP
28103.43d
Not to scale
67 kHz PWM with ±5% Frequency Jittering
Cost Reduction of EMI Noise Filtering
Rugged 650 V Avalanche-Rated MOSFET
Simplifi ed Surge Absorption
No V
Low
Auto-Burst Mode for Stand-By Operation or Light Loads
Less Transformer Audible Noise
Built-In Leading Edge Blanking
Low Operating Current (4 mA max)
r
DSS
DS(on)
Derating Required
(3.95 Ω maximum)
Vcc
FM
5
2
OVP
125°C
TSD
32V
PWM OSC
OCP
R
S
Functional Block Diagram
7.2V
Delay
10 µs
Q
RESET
Feedback
Control
R
S Q
CV/CC
Flyback Switching Regulators
Description
The STR-A6251MD is a 67 kHz PWM topology (with ±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.
This is a higher-frequency version of the STR-A6251D.
Covering the power range from below 21 watts for a 230 VAC
input, or to 15 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.
Cycle-by-cycle current limiting, undervoltage lockout with
hysteresis, overvoltage protection, and thermal shutdown
protect the power supply during the normal overload and
fault
shutdown are latched after a short delay. The latch may
Continued on the next page…
Internal
BIAS
Universal-Input/15 W 67 kHz
conditions. Overvoltage protection and thermal
Modulation
Frequency
OLP
13.4V/10V
UVLO
Drive
STR-A6251MD
Istartup
=1.1mA
LEB
8
7
1
4
3
D
D
S/OCP
GND
FB/CC
/OLP

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str-a6251md Summary of contents

Page 1

... Universal-Input/ kHz Flyback Switching Regulators Description The STR-A6251MD kHz PWM topology (with ±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. ...

Page 2

... Latching Overvoltage Protection (OVP) Undervoltage Lockout (UVLO) with Hysteresis Latching Thermal Shutdown (TSD) Molded Small-Size 8-Pin Package ▪ For Low-Height SMPS Selection Guide Part Number STR-A6251MD *Contact Allegro for additional packing options ABSOLUTE MAXIMUM RATINGSat T Characteristic Symbol Control Supply Voltage V CC ...

Page 3

... OLP FB(MAX SET(CC RES(CC startup 35.2 V CC(OVP =35.2 8.6 V CC( =35.2 5 θ JF STR-A6251MD 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 ...

Page 4

... STR-A6251MD 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 STR-A6251MD Universal-Input/ kHz Flyback Switching Regulator 5 ...

Page 6

... STR-A6251MD 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 regu- lation during IC initialization. The products described herein are manufactured in Japan by Sanken Electric Co ...

Page 7

... Dimensions in Millimeters (controlling dimensions) Terminal Finish: Pure Sn, 2 Product Weight: Approx. 0.51 g. Frame temperature For more effi cient heat radiation, connect a broad PCB pattern at pins 7 and 8. STR-A6251MD Universal-Input/13 W (for reference only) nd level interconnect category (e3 measured at the root of pin 3. EI 26EI 7 ...

Page 8

... Pencoed, Bridgend CF35 5HY, United Kingdom Tel: 44-1656-869-100, Fax: 44-1656-869-162 North America United States Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01606, U.S.A. Tel: 1-508-853-5000, Fax: 1-508-853-7895 Allegro MicroSystems, Inc. 14 Hughes Street, Suite B105 Irvine, California 92618, U.S.A. Tel: 1-949-460-2003, Fax: 1-949-460-7837 STR-A6251MD Universal-Input/ ...

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