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PDF STR-A6251M Data sheet ( Hoja de datos )
| Número de pieza | STR-A6251M | |
| Descripción | Universal-Input/15 W 67 kHz Flyback Switching Regulator | |
| Fabricantes | Allegro MicroSystems | |
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SwRitecghuinlagtors
STR-A6251M
Universal-Input/15 W
67 kHz Flyback Switching Regulator
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Control Supply Voltage, VCC . . . . 36 V
Drain-Source Voltage, VDSS . . . . . . 650 V
Drain Switching Current, ID . . . . 2.5 A*
Peak Drain Switching Current,
IDM . . . . . . . . . . . . . . . . . . . . . . 2.5 A
Single-Pulse Avalanche Energy,
EAS . . . . . . . . . . . . . . . . . . . . 72 mJ
S/OCP Voltage Range,
VOCP . . . . . . . . . . . . –0.3 V to +6 V
FB/CC/OLP Voltage Range,
VFB/OLP . . . . . . . . . . –0.3 V to +12 V
FM Voltage Range,
VFM . . . . . . . . . . . . . –0.3 V to +6 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
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).
The STR-A6251M is a 67 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. This is a higher-frequency
version of the STR-A6251.
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, 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.
Cycle-by-cycle current limiting, undervoltage lockout with hyster-
esis, overvoltage protection, and thermal shutdown protect the power
suppwwlwy.DadtauShreient4Ug.cotmhe 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.
FEATURES AND BENEFITS
■ 67 kHz PWM with ±5% Frequency Jittering
Cost Reduction of EMI Noise Filtering
■ Rugged 650 V Avalanche-Rated MOSFET
Simplified Surge Absorption
No VDSS Derating Required
■ Low rDS(on) (3.95 Ω maximum)
■ 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
continued
Always order by complete part number, e.g., STR-A6251M .
Sanken Power Devices
from Allegro MicroSystems
1 page  
SwRitecghuinlagtors
STR-A6251M
Universal-Input/13 W
67 kHz Flyback Switching Regulator
MOSFET TYPICAL CHARACTERISTICS (cont’d)
WARNING — These devices are designed to be operated at lethal voltages and energy levels. Circuit designs
that embody these components must conform with applicable safety requirements. 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
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet STR-A6251M.PDF ] | |
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