ALLEGRO STR

STR-A6169
Data Sheet
28102.24
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Universal-Input/5 W
Flyback Switching Regulator
The STR-A6169 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 800 V power MOSFET.
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Control Supply Voltage, VCC . . . . 35 V
Drain-Source Voltage, VDSS . . . . . . 800 V
Drain Switching Current, ID . . . . 1.2 A*
Peak Drain Switching Current,
IDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 A
Single-Pulse Avalanche Energy,
EAS . . . . . . . . . . . . . . . . . . . . . 7 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)) . . . . . 0.15 W
MOSFET (VDSS × ID) . . . . . . 1.35 W
total . . . . . . . . . . . . . . . . . . . . 1.5 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 temperature
(page 2) and safe operating area (page 4).
†For the availability of parts meeting -40°C
requirements, contact Allegro’s Sales Representative.
Covering the power range from below 8 watts for a 230 VAC input,
or 5 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. Devices with an increased output power
rating are the STR-A6151 and STR-A6159.
Cycle-by-cycle current limiting, undervoltage lockout with hysteresis, 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-A6169 is provided in an 8pin mini-DIP plastic package.
FEATURES AND BENEFITS
■ Rugged 800 V Avalanche-Rated MOSFET
Simplified Surge Absorption
No VDSS Derating Required
■ 19.2 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-A6169 .
Sanken Power Devices
from Allegro MicroSystems
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STR-A6169
Universal-Input/5 W
Flyback Switching Regulator
FUNCTIONAL BLOCK DIAGRAM
FEATURES
AND
BENEFITS (cont’d)
■ Auto-Bias Function
Stable Burst Operation Without Generating Interference
■ 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
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115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036
Copyright © 2005 Allegro MicroSystems, Inc.
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STR-A6169
Universal-Input/5 W
Flyback Switching Regulator
ELECTRICAL CHARACTERISTICS at TA = 25°C, VCC = 20 V (unless otherwise specified).
Pin
Ratings
Characteristic
Drain-to-Source Breakdown Volt.
No.
8-1
Symbol
VDSS
Drain Leakage Current
8-1
I DSS
On-State Resistance
MOSFET Switching Time
Operation Start Voltage
Operation Stop Voltage
Circuit Current in Operation
Circuit Current in Non-Operation
Auto-Bias Threshold Voltage
VCC(bias) – VCC(OFF)
Maximum OFF Time
OCP Threshold Voltage
Leading Edge Blanking Time
Burst Threshold Voltage
OLP Threshold Voltage
Current at OLP Operation
Maximum FB Current
Start-Up Current
Start-Up Circuit Leakage Current
OVP Operation Voltage
OVP/TSD Latch Sustaining Current
OVP/TSD Latch Release Voltage
8
8
2
2
2
2
2
Thermal Shutdown
Thermal Resistance
8
1
8
4
4
4
4
5
5
2
2
2
-
1
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
rDS(on)
tf
VCC(ON)
VCC(OFF)
I CC(ON)
ICC(OFF)
VCC(bias)
t OFF
VOCP
tb
Vburst
VOLP
IOLP
IFB(MAX)
I startup
Istart(leak)
VCC(OVP)
I CC(H)
VCC
TJ
R θJF
Test Conditions
ID = 300 µA,
V1 – V3 = 0 V (short)
VDS = 800 V,
V1 – V3 = 0 V (short)
ID = 0.4 A
VCC = 0 19.2 V
VCC = 19.2 9 V
VCC = 14 V
VCC = 20 9.6 V
VCC
VCC
VCC
VCC
-
= 15 V
= 0 34.1 V
=34.1 8.5 V
=34.1 6.6 V
Min
800
Typ
-
Max
-
Units
V
-
-
300
µA
16
9.0
9.6
0.2
7.3
0.69
200
0.70
6.5
-18
227
340
28.7
6.6
17.5
10
10.6
0.6
8.0
0.77
320
0.79
7.2
-26
300
790
31.2
7.3
19.2
250
19.2
11
4.0
50
11.6
8.7
0.86
480
0.88
7.9
-35
388
1230
30
34.1
200
8.0
Ω
ns
V
V
mA
µA
V
V
µs
V
ns
V
V
µA
µA
µA
µA
V
µA
V
135
-
-
52
°C
°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.
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STR-A6169
Universal-Input/5 W
Flyback Switching Regulator
MOSFET TYPICAL CHARACTERISTICS
Avalanche energy is measured at VDD = 99 V, L = 20 mH, IL = 1.2 A.
4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036
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STR-A6169
Universal-Input/5 W
Flyback Switching Regulator
MOSFET TYPICAL CHARACTERISTICS (cont’d)
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STR-A6169
Universal-Input/5 W
Flyback Switching Regulator
APPLICATIONS INFORMATION
Complete product description and applications information
is provided in Application Note 28102.20, Series STRA6100 Flyback Switching Regulators.
Typical Application
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 products described herein, the applicability and
suitability of such products for the intended purpose shall be reviewed at
the users responsibility.
Although Sanken undertakes to enhance the quality and reliability of
its products, the occurrence of failure and defect of semiconductor
products at a certain rate is inevitable.
Users of Sanken products are requested to take, at their own risk,
preventative measures including safety design of the equipment or
systems against any possible injury, death, fires or damages to society
due to device failure or malfunction.
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Sanken products listed in this publication are designed and intended
for use as components in general-purpose electronic equipment or
apparatus (home appliances, office equipment, telecommunication
equipment, measuring equipment, etc.). Their use in any application
requiring radiation hardness assurance (e.g., aerospace equipment) is
not supported.
When considering the use of Sanken products in applications where
higher reliability is required (transportation equipment and its control
systems or equipment, fire- or burglar-alarm systems, various safety
devices, etc.), contact a company sales representative to discuss and
obtain written confirmation of your specifications.
The use of Sanken products without the written consent of Sanken in
applications where extremely high reliability is required (aerospace
equipment, nuclear power-control stations, life-support systems, etc.) is
strictly prohibited.
The information included herein is believed to be accurate and
reliable. Application and operation examples described in this publication 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.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036
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STR-A6169
Universal-Input/5 W
Flyback Switching Regulator
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
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