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STRA6259H Datasheet Preview

STRA6259H Datasheet

Universal-Input 13 W 100 kHz Flyback Switching Regulators

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Sanken Power Devices
from Allegro MicroSystems
STR-A6259H
Universal-Input 13 W 100 kHz
Flyback Switching Regulators
The STR-A6259H is a 100 kHz PWM topology (with ±5% freq-
uency jittering for minimum EMI) regulator specifically designed
to satisfy the requirements for increased integration and reliability
Package DIP-8
in flyback converters. It incorporates a primary control and drive
circuit with an avalanche-rated power MOSFET.
Covering the power range from below 17 watts for a
Approximate Scale 1:1
230 VAC input, or to 13 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 func-
tion reduces power consumption at light load, while multiple
FEATURES AND BENEFITS
100 kHz PWM with ±5% frequency jittering for EMI noise
protections, including the avalanche-energy guaranteed MOSFET,
provide high reliability of system design.
Cycle-by-cycle current limiting, undervoltage lockout with
filtering cost reduction
hysteresis, overvoltage protection, and thermal shutdown protect
Rugged 650 V avalanche-rated MOSFET:
• Simplified surge absorption
the power supply during the normal overload and fault conditions.
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Overvoltage protection and thermal shutdown are latched after a
short delay. The latch may be reset by cycling the input supply.
• No VDSS derating required
Low RDS(on) : 6 Ω maximum
Auto-burst mode for stand-by operation or light loads; less
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
transformer audible noise
6 removed. The leadframe plating is pure Sb, and the package
Built-in leading edge blanking
complies with RoHS.
Soft start and low start-up current; start-up circuit disabled in
operation
Auto-burst stand-by (intermittent operation) input power
<0.1 W at no load
Built-in constant-voltage/constant current (CV/CC)
Multiple protections:
• Pulse-by-pulse overcurrent protection (OCP)
• Overload protection (OLP) with auto restart
• Latching overvoltage protection (OVP)
• Undervoltage lockout (UVLO) with hysteresis
• Latching thermal shutdown (TSD)
All performance characteristics given are typical values for circuit or
system baseline design only and are at the nominal operating voltage and Always order by complete part number, e.g.: STR-A6259H
an ambient temperature of +25°C, unless otherwise stated.
Datasheet 28103.44-6b




Allegro MicroSystems

STRA6259H Datasheet Preview

STRA6259H Datasheet

Universal-Input 13 W 100 kHz Flyback Switching Regulators

No Preview Available !

STR-A6259H
Universal Input 13 W 100 kHz
Flyback Switching Regulators
FUNCTIONAL BLOCK DIAGRAM AND TERMINAL ASSIGNMENTS
Vcc 5
OVP
32V
TSD
125°C
RESET
7.2V
Delay
10 µs
R
SQ
Internal
BIAS
UVLO
13.4V/10V
FM/SS 2
PWM OSC
RQ
S
CV/CC
OCP
Feedback
Control
Soft Start
OLP
Frequency
Modulation
Istartup
=1.1mA
Drive
LEB
8D
7D
1 S/OCP
FB/CC
4 /OLP
3 GND
Number
1
2
3
Name
S/OCP
FM/SS
GND
Description
Source/OCP terminal
FM/Soft start terminal
Ground terminal
4 FB /CC/OLP FB/CC/OLP terminal
5
VCC
Power supply terminal
7
D Drain terminals
8
Functions
MOSFET Source/Overcurrent
protection
Capacitor connection terminal for
frequency jitter and soft start.
Ground
Input of constant voltage control
signal / constant current operation
control signal / over load protection
signal
Input of power supply for control
circuit
MOSFET drain / Input of startup
current
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036
2


Part Number STRA6259H
Description Universal-Input 13 W 100 kHz Flyback Switching Regulators
Maker Allegro MicroSystems
Total Page 13 Pages
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