STR-X6768N [ALLEGRO]
Off-Line Quasi-Resonant Switching Regulators; 离线准谐振开关稳压器
| 型号： | STR-X6768N |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | Off-Line Quasi-Resonant Switching Regulators |
| 文件： | 总11页 (文件大小：525K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
STR-X6768N
Off-Line Quasi-Resonant Switching Regulators
Features and Benefits
Description
▪ Quasi-resonant topology IC Low EMI noise and soft
switching
TheSTR-X6768Nisaquasi-resonanttopologyICdesignedfor
SMPS applications. It shows lower EMI noise characteristics
than conventional PWM solutions, especially at greater than
2 MHz. It also provides a soft-switching mode to turn on the
internal MOSFET at close to zero voltage (VDS bottom point)
by use of the resonant characteristic of primary inductance
and a resonant capacitor.
▪ Bottom-skip mode Improved system efficiency over
the entire output load by avoiding increase of switching
frequency
▪ Standby mode Lowers input power at very light output
load condition
▪ Avalanche-guaranteed MOSFET Improves system-level
reliability and does not require VDSS derating
▪ 800 VDSS / 1.00 Ω RDS(on)
▪ Various protections Improved system-level reliability
▫ Pulse-by-pulse drain overcurrent limiting
▫ Overvoltage Protection (bias winding voltage sensing),
with latch
The package is a fully molded TO-3P, which contains the
controller chip (MIC) and MOSFET, enabling output power
up to 220 W at 230 VAC and 150 W at universal input. The
bottom-skipmodeskipsthefirstbottomofVDS andturnsonthe
MOSFET at the second bottom point, to minimize an increase
of operating frequency at light output load, improving system-
level efficiency over the entire load range.
▫ Overload Protection with latch
▫ Maximum on-time limit
Astandbymodeisexecutedbyclampingthesecondaryoutput.
In general applications, standby mode reduces input power.
Package: 7-Pin TO-3P
Thesoft-startmodeminimizessurgevoltageandreducespower
stress to the MOSFET and to the secondary rectifying diodes
during the start-up sequence.
Variousprotectionssuchasovervoltage,overload,overcurrent,
maximumon-timeprotectionsandavalanche-energyguaranteed
MOSFET secure good system-level reliability.
Continued on the next page…
Not to scale
Typical Application
28103.30-11
Off-Line Quasi-Resonant Switching Regulators
STR-X6768N
Description (continued)
Applications include the following:
▪ Set Top Box
▪ LCD PC monitor, LCD TV
▪ Printer, Scanner
▪ SMPS power supplies
Selection Guide
Part Number
STR-X6768N
Package
TO-3P
Absolute Maximum Ratings at TA = 25°C
Parameter
Symbol
IDpeak Single pulse
Conditions
Rating
20
Unit
A
Drain Current1
Maximum Switching Current2
Single Pulse Avalanche Energy3
Input Voltage for Controller (MIC)
SS/OLP Terminal Voltage
FB Terminal Inflow Current
FB Terminal Voltage
IDmax
EAS
VCC
VSSOLP
IFB
VFB
TA = –20°C to 125°C
Single pulse, VDD = 30 V, L = 50 mH, ILpeak = 3.9 A
20
395
35
A
mJ
V
V
mA
V
–0.5 to 6.0
10
–0.5 to 9.0
–1.5 to 5.0
46
2.8
0.8
–20 to 125
–20 to 125
–40 to 125
150
IFB within the limits of IFB
OCP/BD Terminal Voltage
VOCPBD
V
With infinite heatsink
Without heatsink
VCC × ICC
W
W
W
°C
°C
°C
°C
MOSFET Power Dissipation4
PD1
Controller (MIC) Power Dissipation
Operating Internal Leadframe Temperature
Operating Ambient Temperature
Storage Temperature
Channel Temperature
1Refer to MOSFET ASO curve
2IDMAX is the drain current determined by the drive voltage of the IC and the threshold voltage, Vth, of the MOSFET
3Refer to Avalanche Energy Derating curve
4Refer to MOSFET Ta-PD1 curve
PD2
TF
TOP
Recommended operation temperature, see cautions
T
stg
T
ch
All performance characteristics given are typical values for circuit or
system baseline design only and are at the nominal operating voltage and
an ambient temperature, TA, of 25°C, unless otherwise stated.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
2
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Off-Line Quasi-Resonant Switching Regulators
STR-X6768N
Functional
Block Diagram
Terminal List Table
Number
Name
Description
Functions
1
2
3
4
5
D
Drain
MOSFET drain
MOSFET source
Ground
S
Source
GND
VCC
SS/OLP
Ground terminal
Power supply terminal
Input of power supply for control circuit
Soft Start/Overload Protection terminal
Input to set delay for Overload Protection and Soft Start operation
Input for Constant Voltage Control and Burst (intermittent) Mode
oscillation control signals
6
7
FB
Feedback terminal
OCP/BD
Overcurrent Protection/Bottom Detection
Input for Overcurrent Detection and Bottom Detection signals
Allegro MicroSystems, Inc.
115 Northeast Cutoff
3
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Off-Line Quasi-Resonant Switching Regulators
STR-X6768N
STR-X6768N
A.S.O. temperature derating coefficient
curve
STR-X6768N
MOS FET A.S.O. Curve
Ta=25℃
Single pulse
100
80
60
40
20
0
100
10
1
0.1ms
Determined by
On-Resistance
1 ms
Apply A.S.O temperature
coefficient from the left graph
to this curve for evaluating
actual operations' safety
0
20 40 60 80 100 120
TF [℃]
0.1
Internal frame temperature
10
100
VDS[V]
1000
Drain-to-Source Voltage
STR-X6768N
Avalanche energy derating curve
100
80
60
40
20
0
25
50
75
100
125
150
Tch [℃]
Channel temperature
Allegro MicroSystems, Inc.
115 Northeast Cutoff
4
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Off-Line Quasi-Resonant Switching Regulators
STR-X6768N
STR-X6768N
MOSFET Ta-PD1 Curve
STR-X6768N
MIC TF-PD2 Curve
60
50
40
30
20
10
0
1
0.8
0.6
0.4
0.2
0
PD1=46[W]
With infinite heatsink
Without heatsink
PD1=2.8[W]
0
20 40 60 80 100 120 140
0
20
40
60
80 100 120 140
TF〔℃〕
Ta〔℃〕
Internal frame temperature
Ambient temperature
STR-X6768N
Transient thermal resistance curve
1
0.1
0.01
0.001
ｔ〔sec〕
Time
1μ
100 m
Allegro MicroSystems, Inc.
115 Northeast Cutoff
5
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Off-Line Quasi-Resonant Switching Regulators
STR-X6768N
ELECTRICAL CHARACTERISTICS
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
ELECTRICAL CHARACTERISTICS for Controller (MIC)1, valid at TA = 25°C, VCC = 20 V, unless otherwise specified
Power Supply Start-up Operation
VCC = 0→20 V
Operation Start Voltage
VCC(ON)
VCC(OFF)
ICC(ON)
16.3
8.8
–
18.2
9.7
–
19.9
10.6
6
V
V
VCC = 20→8.8 V
Operation Stop Voltage
Circuit Current In Operation
mA
μA
kHz
V
VCC = 15 V
Circuit Current In Non-Operation
Oscillation Frequency
ICC(OFF)
fosc
VSSOLP(SS)
ISSOLP(SS)
–
–
100
25
19
22
VSS/OLP increasing
VSS/OLP = 0 V
Soft Start Operation Stop Voltage
Soft Start Operation Charging Current
Normal Operation
1.1
–710
1.2
–550
1.4
–390
μA
Bottom-Skip Operation Threshold Voltage 1
Bottom-Skip Operation Threshold Voltage 2
Overcurrent Detection Threshold Voltage
OCP/BD Terminal Outflow Current
Quasi-Resonant Operation Threshold Voltage 1
Quasi-Resonant Operation Threshold Voltage 2
FB Terminal Threshold Voltage
VOCPBD(BS1)
VOCPBD(BS2)
VOCPBD(LIM)
IOCPBD
–0.720 –0.665 –0.605
–0.485 –0.435 –0.385
–0.995 –0.940 –0.895
V
V
VOCP/BD falling
VOCP/BD = –0.95 V
VOCP/BD falling
VOCP/BD rising
VFB rising
V
–250
0.28
0.67
1.32
600
–100
0.40
0.80
1.45
1000
–40
0.52
0.93
1.58
1400
μA
V
VOCPBD(TH1)
VOCPBD(TH2)
VFB(OFF)
V
V
VFB = 1.6 V
FB Terminal Inflow Current (Normal Operation)
Standby Operation
IFB(ON)
μA
VCC = 0→15 V, VFB = 1.6 V
VCC(SK) = VCC(S) – VCC(OFF)
VCC = 10.2 V, VFB = 1.6 V
VCC = 10.2 V, VFB = 1.6 V
VCC = 15 V, VFB rising
Standby Operation Start Voltage
Standby Operation Start Voltage Interval
Standby Non-Operation Circuit Current
FB Terminal Inflow Current, Standby Operation
FB Terminal Threshold Voltage, Standby Operation
Minimum On Time
VCC(S)
VCC(SK)
ICC(S)
10.3
1.10
–
11.2
1.35
20
12.1
1.65
56
V
V
μA
μA
V
IFB(S)
–
4
14
VFB(S)
tON(MIN)
0.55
0.5
1.10
0.95
1.50
1.40
μs
Protection Operation
Maximum On Time
tON(MAX)
VSSOLP(OLP)
ISSOLP(OLP)
VCC(OVP)
ICC(H)
27.5
4.0
–16
25.5
–
32.5
4.9
39.0
5.8
μs
V
Overload Protection Operation Threshold Voltage
Overload Protection Operation Charging Current
Overvoltage Protection Operation Voltage
Latch Circuit Holding Current2
VSS/OLP = 2.5 V
–11
27.7
45
–6
μA
V
VCC = 0→30 V
29.9
140
8.5
VCC(OFF)– 0.3 V
μA
V
Latch Circuit Release Voltage2
VCC(La.OFF)
6.0
7.2
VCC = 30→6 V, OVP operating
ELECTRICAL CHARACTERISTICS for MOSFET, valid at TA = 25°C, unless otherwise specified
Drain-to-Source Breakdown Voltage
Drain Leakage Current
On Resistance
VDSS
IDSS
RDS(on)
tf
IDSS = 300 μA
VDSSS = 800 V
IDS = 2.5 A
800
–
–
–
–
–
–
–
V
μA
300
1.0
–
Ω
Switching Time
–
450
0.99
ns
Thermal Resistance
Rθch-F
Channel to internal frame
–
°C/W
1Current polarity with respect to the IC: positive current indicates current sink at the terminal named, negative current indicates source at the
terminal named.
2The latch circuit means a circuit operated OVP and OLP.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
6
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Off-Line Quasi-Resonant Switching Regulators
STR-X6768N
Packing Specifications
388
100 pieces per tray
5 trays per inner carton
(Outer packing dependent on quantity)
Dimensions in millimeters
137
48
364
333
177
4 inner cartons per outer carton
500 pieces maximum per inner carton
2000 pieces maximum per outer carton
Dimensions in millimeters
356
137
206
2 inner cartons per outer carton
500 pieces maximum per inner carton
1000 pieces maximum per outer carton
Dimensions in millimeters
Allegro MicroSystems, Inc.
115 Northeast Cutoff
7
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Off-Line Quasi-Resonant Switching Regulators
STR-X6768N
Package Outline Drawing, TO-3P
15.6 ±0.2
5.5±0.2
6
Gate Burr
3.45±0.2
Branding
Area
XXXXXXXX
XXXXXXXX
XXXXXXXX
3.35±0.1
+0.2
–0.1
0.55
View A
4.5 ±0.7
4.5 ±0.7
2X 2.54±0.1
4X 1.27±0.1
Terminal dimension at lead tip
Terminal dimension at lead tip
+0.2
–0.1
1
4
6
+0.2
–0.1
1.33
5X 0.75
3
5
7
+0.2
–0.1
+0.2
–0.1
5X 0.65
2X 0.83
+0.2
–0.1
1.89
2
Enlargement View A
0.7
0.7
0.7
0.7
Front View (Plan View)
Side View
Gate burr: 0.3 mm (max.)
Terminal core material: Cu
Terminal treatment: Ni plating and Pb-free solder dip
Leadform: 1902
Drawing for reference only
Branding codes (exact appearance at manufacturer discretion):
1st line, type: STR
2nd line, subtype: X6768
3rd line, lot: YM DD N
Where: Y is the last digit of the year of manufacture
Approximate weight: 6 g
Dimensions in millimeters
M is the month (1 to 9, O, N, D)
DD is the 2-digit date
N is the suffix of the subtype
Leadframe plating Pb-free. Device composition
includes high-temperature solder (Pb >85%),
which is exempted from the RoHS directive.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
8
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Off-Line Quasi-Resonant Switching Regulators
STR-X6768N
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. Precau-
tions must be taken to prevent accidental contact with power-line potentials.
The use of an isolation transformer is recommended during circuit development and breadboarding.
Because reliability can be affected adversely by improper storage
Heatsink Mounting Method
environments and handling methods, please observe the following
cautions.
Cautions for Storage
•
Torque When Tightening Mounting Screws. Thermal resistance
increases when tightening torque is low, and radiation effects are
decreased. When the torque is too high, the screw can strip, the
heatsink can be deformed, and distortion can arise in the product
frame. To avoid these problems, observe the recommended tightening
torques for this product package type, TO-3P: 0.588 to 0.785 N•m
(6 to 8 kgf•cm).
•
Ensure that storage conditions comply with the standard
temperature (5°C to 35°C) and the standard relative humidity
(around 40 to 75%); avoid storage locations that experience
extreme changes in temperature or humidity.
•
•
Avoid locations where dust or harmful gases are present and
avoid direct sunlight.
Reinspect for rust on leads and solderability of products that have
been stored for a long time.
•
For effective heat transfer, the contact area between the product and
the heatsink should be free from burrs and metal fragments, and the
heatsink should be flat and large enough to contact over the entire
side of the product, including mounting flange and exposed thermal
pad, and have a minimal mounting hole to prevent possible deflection
and cracking of the product case when fastened to the heatsink.
Cautions for Testing and Handling
When tests are carried out during inspection testing and other
standard test periods, protect the products from power surges
from the testing device, shorts between adjacent products, and
shorts to the heatsink.
Soldering
•
When soldering the products, please be sure to minimize the
working time, within the following limits:
Remarks About Using Silicone Grease with a Heatsink
•
•
•
When silicone grease is used in mounting this product on a
heatsink, it shall be applied evenly and thinly. If more silicone
grease than required is applied, it may produce stress.
260±5°C 10 s
350±5°C 3 s
•
Soldering iron should be at a distance of at least 1.5 mm from the
body of the products
Coat the back surface of the product and both surfaces of the
insulating plate to improve heat transfer between the product and
the heatsink.
Electrostatic Discharge
•
When handling the products, operator must be grounded.
Grounded wrist straps worn should have at least 1 MΩ of
resistance to ground to prevent shock hazard.
Volatile-type silicone greases may permeate the product and
produce cracks after long periods of time, resulting in reduced
heat radiation effect, and possibly shortening the lifetime of the
product.
•
•
•
Workbenches where the products are handled should be
grounded and be provided with conductive table and floor mats.
•
Our recommended silicone greases for heat radiation purposes,
which will not cause any adverse effect on the product life, are
indicated below:
When using measuring equipment such as a curve tracer, the
equipment should be grounded.
Type
G746
Suppliers
When soldering the products, the head of soldering irons or the
solder bath must be grounded in other to prevent leak voltages
generated by them from being applied to the products.
Shin-Etsu Chemical Co., Ltd.
Momentive Performance Materials
Dow Corning Toray Silicone Co., Ltd.
YG6260
SC102
•
The products should always be stored and transported in our
shipping containers or conductive containers, or be wrapped in
aluminum foil.
Recommended operation temperature
• Inner frame temperature in operation TF = 115°C
Allegro MicroSystems, Inc.
115 Northeast Cutoff
9
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Off-Line Quasi-Resonant Switching Regulators
STR-X6768N
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 im-
provements 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.
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 equip-
ment, 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. The contents in this document must not be transcribed
or copied without Sanken’s or Allegro's written consent.
Copyright ©2009 Allegro MicroSystems, Inc.
This datasheet is based on Sanken datasheet SSE-23896
Allegro MicroSystems, Inc.
115 Northeast Cutoff
10
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Off-Line Quasi-Resonant Switching Regulators
STR-X6768N
Worldwide Contacts
Asia-Pacific
China
Singapore
Sanken Electric Singapore Pte. Ltd.
Sanken Electric Hong Kong Co., Ltd.
Suite 1026, Ocean Centre, Canton Road
Tsimshatsui, Kowloon, Hong Kong
150 Beach Road, #14-03 The Gateway West
Singapore 189720
Tel: 65-6291-4755, Fax: 65-6297-1744
Tel: 852-2735-5262, Fax: 852-2735-5494
Sanken Electric (Shanghai) Co., Ltd.
Room 3202, Maxdo Centre, Xingyi Road 8
Changning District, Shanghai, China
Europe
Sanken Power Systems (UK) Limited
Pencoed Technology Park
Tel: 86-21-5208-1177, Fax: 86-21-5208-1757
Taiwan Sanken Electric Co., Ltd.
Room 1801, 18th Floor, 88 Jung Shiau East Road
Sec. 2, Taipei 100, Taiwan R.O.C.
Pencoed, Bridgend CF35 5HY, United Kingdom
Tel: 44-1656-869-100, Fax: 44-1656-869-162
Tel: 886-2-2356-8161, Fax: 886-2-2356-8261
North America
United States
Japan
Sanken Electric Co., Ltd.
Overseas Sales Headquarters
Metropolitan Plaza Building, 1-11-1 Nishi-Ikebukuro
Toshima-ku, Tokyo 171-0021, Japan
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Tel: 81-3-3986-6164, Fax: 81-3-3986-8637
Worcester, Massachusetts 01606, U.S.A.
Tel: 1-508-853-5000, Fax: 1-508-853-7895
Korea
Sanken Electric Korea Co., Ltd.
Mirae Asset Life Building, 6F
168 Kongduk-dong, Mapo-ku
Seoul 121-705, Korea
Tel: 82-2-714-3700, Fax: 82-2-3272-2145
Allegro MicroSystems, Inc.
14 Hughes Street, Suite B105
Irvine, California 92618, U.S.A.
Tel: 1-949-460-2003, Fax: 1-949-460-7837
Allegro MicroSystems, Inc.
115 Northeast Cutoff
11
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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