STR-A6131 Datasheet, PDF (1/7 Pages) Allegro MicroSystems – 120 V/12 or 16 W Flyback Switching Regulators

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ABSOLUTE MAXIMUM RATINGS
at T_A = +25°C
Control Supply Voltage, V_CC . . . . 35 V
Drain-Source Voltage, V_DSS . . . . . . 500 V
Drain Switching Current, I_D
STR-A6131 . . . . . . . . . . . . . . 3.2 A*
STR-A6132 . . . . . . . . . . . . . . 4.0 A*
Peak Drain Switching Current, I_DM
STR-A6131 . . . . . . . . . . . . . . . 3.2 A
STR-A6132 . . . . . . . . . . . . . . . 4.0 A
Single-Pulse Avalanche Energy, E_AS
STR-A6131 . . . . . . . . . . . . . . 32 mJ
STR-A6132 . . . . . . . . . . . . . . 78 mJ
Start-Up-Pin Voltage Range,
V_startup . . . . . . . . . –0.3 V to +600 V
OCP Voltage Range,
V_OCP . . . . . . . . . . . . –0.5 V to +6 V
FB/OLP Voltage Range,
V_FB/OLP . . . . . . . . . . –0.5 V to +10 V
Package Power Dissipation, P_D
control (V_CC × I_CC(ON)) . . . . . 0.15 W
MOSFET (V_DSS × I_D) . . . . . . 1.35 W
total . . . . . . . . . . . . . . . . . . . . 1.5 W
MOSFET Channel Temp., T_J . +150°C
Internal Frame Temp., T_F . . . . +125°C
Operating Temperature Range,
T_A . . . . . . . . . . . -20°C to +125°C†
Storage Temperature Range,
T_S . . . . . . . . . . . . -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 V_DSS Derating Required
■ Choice of r_DS(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