Universal-Input/20 W
Flyback Switching Regulator
Data Sheet
28103.23*
STR-A6153E
Sanken Power Devices
from Allegro MicroSystems
Switching
Regulators
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Control Supply Voltage, VCC . . . . 35 V
Drain-Source Voltage, VDSS . . . . . . 650 V
Drain Switching Current, ID. . . . 3.4 A*
Peak Drain Switching Current,
IDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 A
Single-Pulse Avalanche Energy,
EAS . . . . . . . . . . . . . . . . . . . 136 mJ
Start-Up-Pin Voltage Range,
Vstartup . . . . . . . . . –0.3 V to +600 V
OCP Voltage Range,
VOCP . . . . . . . . . . . . –0.5 V to +6 V
FB/OLP Voltage Range,
VFB/OLP. . . . . . . . . . –0.5 V to +10 V
Package Power Dissipation, PD
control (VCC × ICC(ON)) . . . . . 0.46 W
MOSFET (VDSS × ID). . . . . . 1.81 W
total. . . . . . . . . . . . . . . . . . . 2.27 W
MOSFET Channel Temp., TJ. +150°C
Internal Frame Temp., TF. . . . +125°C
Operating Temperature Range,
TA. . . . . . . . . . . -20°C to +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).
†For the availability of parts meeting -40°C
requirements, contact Allegro’s Sales Represen-
tative.
The STR-A6153E is a PRC topology (fixed off-time) regulator
specifically designed to satisfy the requirements for increased integration
and reliability in flyback converters. It incorporates a primary control
and drive circuit with avalanche-rated power MOSFET. The STR-
A6153E features high switching current and avalanche-energy ratings
and low on-resistance.
Covering the power range from below 24 watts for a 230 VAC
input, or 20 watts for a universal (85 to 264 VAC) input, this device 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 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
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. The STR-A6153E is provided in an
8-pin mini-DIP plastic package.
FEATURES AND BENEFITS
■Rugged 650 V Avalanche-Rated MOSFET
Simplified Surge Absorption
No VDSS Derating Required
■1.9 Ω rDS(on)
■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-A6153E .
STR-A6153E
Universal-Input/20 W
Flyback Switching Regulator
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036
2
Switching
Regulators
Copyright © 2005 Allegro MicroSystems, Inc.
FUNCTIONAL BLOCK DIAGRAM
FEATURES AND BENEFITS (cont’d)
■Internal Off-Timer Circuit
■Built-In Constant-Voltage Drive
■Multiple Protections:
Pulse-by-Pulse Overcurrent Protection
Overload Protection with Auto Recovery
Latching Overvoltage Protection
Undervoltage Lockout with Hysteresis
Latching Thermal Shutdown
■Molded Small-Size 8-Pin Package
For Low-Height SMPS
Polarized to Prevent Backwards Assembly
STR-A6153E
Universal-Input/20 W
Flyback Switching Regulator
www.allegromicro.com
3
Switching
Regulators
ELECTRICAL CHARACTERISTICS at TA = 25°C, VCC = 20 V (unless otherwise specified).
Pin Ratings
Characteristic No. Symbol Test Conditions Min Typ Max Units
Drain-to-Source Breakdown Volt. 8 - 1 V(BR)DSS ID = 300 µA, 650 - - V
V1 – V3 = 0 V (short)
Drain Leakage Current 8 - 1 IDSS VDS = 650 V, - - 300 µA
V1 – V3 = 0 V (short)
On-State Resistance 8 - 1 rDS(on) ID = 0.4 A - - 1.9 Ω
MOSFET Switching Time 8 - 3 tf- - - 250 ns
Operation Start Voltage 2 - 3 VCC(ON) VCC = 0 19.2 V 16 17.5 19.2 V
Operation Stop Voltage 2 - 3 VCC(OFF) VCC = 19.2 9 V 9.0 10 11 V
Circuit Current in Operation 2 - 3 ICC(ON) - - - 4.0 mA
Circuit Current in Non-Operation 2 - 3 ICC(OFF) VCC = 14 V - - 50 µA
Maximum OFF Time 8 - 3 tOFF - 10.5 11.5 12.5 µs
OCP Threshold Voltage 1 - 3 VOCP - 0.96 1.13 1.28 V
Leading Edge Blanking Time 8 - 3 tb- 200 320 480 ns
Burst Threshold Voltage 4 - 3 Vburst 0.66 0.75 0.84 V
OLP Threshold Voltage 4 - 3 VOLP - 6.5 7.2 7.9 V
Current at OLP Operation 4 - 3 IOLP - -18.2 -26 -34.1 µA
Maximum FB Current 4 - 3 IFB(MAX) - 220 300 390 µA
Start-Up Current 5 - 3 Istartup VCC = 15 V 340 790 1230 µ A
Start-Up Circuit Leakage Current 5 - 3 Istart(leak) ---30µA
OVP Operation Voltage 2 - 3 VCC(OVP) VCC = 0 34.1 V 28.7 31.2 34.1 V
OVP/TSD Latch Sustaining Current
2 - 3 ICC(H) VCC =34.1 8.5 V - - 200 µA
OVP/TSD Latch Release Voltage 2 - 3 VCC VCC =34.1 6.6 V 6.6 7.3 8.0 V
Thermal Shutdown - TJ- 110 - - °C
Thermal Resistance - RθJF - - - 52 °C/W
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.
STR-A6153E
Universal-Input/20 W
Flyback Switching Regulator
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036
4
Switching
Regulators
Avalanche energy is measured at VDD = 99 V, L = 20 mH, I L = 3.4 A.
MOSFET TYPICAL CHARACTERISTICS
STR-A6153E
Universal-Input/20 W
Flyback Switching Regulator
www.allegromicro.com
5
Switching
Regulators
MOSFET TYPICAL CHARACTERISTICS (cont’d)
STR-A6153E
Universal-Input/20 W
Flyback Switching Regulator
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036
6
Switching
Regulators
The STR-6153E is similar to other devices in the series
except that the maximum OFF time is typically 11.5 µs and
the auto-bias function is deleted. Complete product de-
scription and applications information is provided in
Application Note 28103.20, Series STR-A6100 Flyback
Switching Regulators.Typical Application
APPLICATIONS INFORMATION
The products described herein are manufactured in Japan by Sanken
Electric Co., Ltd. for sale by Allegro MicroSystems, Inc.
Sanken and Allegro reserve the right to make, from time to time, such
departures from the detail specifications as may be required to permit
improvements in the performance, reliability, or manufacturability of its
products. Therefore, the user is cautioned to verify that the information
in this publication is current before placing any order.
When using the pr oducts described her ein, the applicability and
suitability of such pr oducts for the intended purpose shall be r eviewed at
the users responsibility .
Although Sanken undertakes to enhance the quality and reliability of
its pr oducts, the occurr ence of failur e and defect of semiconductor
pr oducts at a certain rate is inevitable.
Users of Sanken pr oducts ar e r equested to take, at their own risk,
pr eventative measur es including safety design of the equipment or
systems against any possible injury , death, fir es or damages to society
due to device failure or malfunction.
Sanken pr oducts listed in this publication are designed and intended
for use as components in general-purpose electr onic equipment or
apparatus (home appliances, office equipment, telecommunication
equipment, measuring equipment, etc.). Their use in any application
r equiring radiation har dness assurance (e.g., aerospace equipment) is
not supported.
When considering the use of Sanken pr oducts in applications wher e
higher r eliability is r equired (transportation equipment and its contr ol
systems or equipment, fir e- or burglar-alarm systems, various safety
devices, etc.), contact a company sales r epresentative to discuss and
obtain written confirmation of your specifications.
The use of Sanken pr oducts without the written consent of Sanken in
applications wher e extremely high r eliability is requir ed (aer ospace
equipment, nuclear power-contr ol stations, life-support systems, etc.) is
strictly pr ohibited.
The information included herein is believed to be accurate and
reliable. Application and operation examples described in this publica-
tion are given for reference only and Sanken and Allegro assume no
responsibility for any infringement of industrial property rights,
intellectual property rights, or any other rights of Sanken or Allegro or
any third party that may result from its use.
STR-A6153E
Universal-Input/20 W
Flyback Switching Regulator
www.allegromicro.com
7
Switching
Regulators
PACKAGE DIMENSIONS
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
Product Weight: Approx. 0.51 g.
Frame temperature, TF, is measured at the root of pin 3.
EI16EI
