datasheet for STR-X6757 by Allegro MicroSystems, Inc.

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datasheet for STR-X6757 by Allegro MicroSystems, Inc. | Manualzz

STR-X6757

Off-Line Quasi-Resonant Switching Regulators

Features and Benefits

Quasi-resonant topology IC

 Low EMI noise and soft switching

Bottom-skip mode

 Improved system efficiency over the entire output load by avoiding increase of switching frequency

Auto-Standby mode

 Lowers input power at very light output load condition

Avalanche-guaranteed MOSFET

 Improves system-level reliability and does not require V

DSS

derating

650 V

DSS

/ 0.62 R

DS(on)

Various protections

 Improved system-level reliability

Pulse-by-pulse drain overcurrent limiting

Overvoltage Protection (bias winding voltage sensing), with latch

Overload Protection with latch

Maximum on-time limit

Package: 7-Pin TO-3P

Description

The STR-X6757 is a quasi-resonant topology IC designed for

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 (V

DS

bottom point) by use of the resonant characteristic of primary inductance and a resonant capacitor.

The package is a fully molded TO-3P, which contains the controller chip (MIC) and MOSFET, enabling output power up to 320 W at 230 VAC and 165 W at universal input. The bottom-skip mode skips the first bottom of V

DS

and turns on the

MOSFET at the second bottom point, to minimize an increase of operating frequency at light output load, improving systemlevel efficiency over the entire load range.

There are two standby modes available to reduce the input power under very light load conditions. The first is Auto-Standby mode, which is internally triggered by periodic sensing, and the other is a manual standby mode, which is executed by clamping the secondary output. In general applications, the manual standby mode reduces the input power further compared to Auto-Standby mode.

Continued on the next page…

Not to scale

Typical Application

STRX6757DS

SANKEN ELECTRIC CO., LTD.

http://www.sanken-ele.co.jp/en/

STR-X6757 Off-Line Quasi-Resonant Switching Regulators

Description (continued)

The soft-start mode minimizes surge voltage and reduces power stress to the MOSFET and to the secondary rectifying diodes during the start-up sequence. Various protections such as overvoltage, overload, overcurrent, maximum on-time protections and avalanche-energyguaranteed MOSFET secure good system-level reliability.

Applications include the following:

Set Top Box

LCD PC monitor, LCD TV

Printer, Scanner

SMPS power supplies

Selection Guide

Part Number

STR-X6757

Package

TO-3P

Absolute Maximum Ratings at T

A

= 25°C

Drain Current 1

Parameter

Maximum Switching Current

OCP/BD Terminal Voltage

MOSFET Power Dissipation

2

Single Pulse Avalanche Energy 3

Input Voltage for Controller (MIC)

SS/OLP Terminal Voltage

FB Terminal Inflow Current

FB Terminal Voltage

4

Symbol Conditions

I

D peak Single pulse

I

Dmax

T

A

= –20°C to 125°C

E

AS

V

CC

Single pulse, V

DD

= 30 V, L = 50 mH, I

Lpeak

= 3.53 A

V

SSOLP

I

FB

V

FB

V

OCPBD

I

FB

within the limits of I

FB

With infinite heatsink

P

D1

Without heatsink

Controller (MIC) Power Dissipation

Operating Internal Leadframe Temperature

Operating Ambient Temperature

Storage Temperature

P

D2

T

F

T

OP

T stg

V

CC

× I

CC

Recommended operation temperature, see cautions

Channel Temperature T ch

1 Refer to MOSFET ASO curve

2 I

DMAX

is the drain current determined by the drive voltage of the IC and the threshold voltage, V th

, of the MOSFET

3 Refer to Avalanche Energy Derating curve

4 Refer to MOSFET Ta-PD1 curve

Rating

18

18

326

35

–0.5 to 6.0

10

–0.5 to 9.0

–1.5 to 5.0

44

2.8

0.8

–20 to 125

–20 to 125

–40 to 125

150

°C

°C

°C

°C

V

W

W

W

Unit

A

A mJ

V

V mA

V

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, T

A

, of 25°C, unless oth er wise stated.

STRX6757DS

SANKEN ELECTRIC CO., LTD.

2

STR-X6757

Functional

Block Diagram

Off-Line Quasi-Resonant Switching Regulators

Terminal List Table

Number Name

1

2

3

4

5

6

7

D

S

GND

VCC

SS/OLP

FB

OCP/BD

Description

Drain

Source

Ground terminal

MOSFET drain

MOSFET source

Ground

Functions

Power supply terminal

Soft Start/Overload Protection terminal

Input of power supply for control circuit

Input to set delay for Overload Protection and Soft Start operation

Feedback terminal

Input for Constant Voltage Control and Burst (intermittent) Mode oscillation control signals

Overcurrent Protection/Bottom Detection Input for Overcurrent Detection and Bottom Detection signals

STRX6757DS

SANKEN ELECTRIC CO., LTD.

3

STR-X6757 Off-Line Quasi-Resonant Switching Regulators

80

60

40

STR-X6757

A.S.O. tempera ture dera ting coefficient curve

100

20

0

0 20 40 60 80 100 120

T

F

[ ]

Interna l fra me tempera ture

10

1

STR-X6757

MOSFET A.S.O. Curve

100

Determined by On-Resistance

1ms

100 s

STR-X6757

Ava la nche energy dera ting curve

100

80

60

40

20

0

25 50 75 100 125

Tch [ ]

Cha nnel tempera ture

150

0.1

Apply A.S.O temperature coefficient from the left graph to this curve for evaluating actual operations' safety

0.01

1 10 100

V

DS

[V]

Drain-to-Source Voltage

1000

4

STRX6757DS

SANKEN ELECTRIC CO., LTD.

STR-X6757 Off-Line Quasi-Resonant Switching Regulators

STRX6757DS

35

30

25

STR-X6757

MOSFET Ta -P

D1

Curve

50

45

40

P D1 =44[W]

With infinite heatsink

20

15

10

5

Without heatsink

P D1 =2.8[W]

0

0 20 40 60 80 100 120 140

Ta [ ]

Ambient tempera ture

1

STR-X6757

MIC T

F

-P

D2

Curve

0.8

0.6

0.4

0.2

0

0 20 40 60 80 100 120 140

T

F

Internal frame temperature

STR-X6757

Transient thermal resistance curve

1

0.1

0.01

0.001

1.0E-06 1.0E-05 1.0E-04 t [sec] time

1.0E-03 1.0E-02 1.0E-01

SANKEN ELECTRIC CO., LTD.

5

STR-X6757 Off-Line Quasi-Resonant Switching Regulators

ELECTRICAL CHARACTERISTICS

Characteristic Symbol Test Conditions Min.

Typ.

ELECTRICAL CHARACTERISTICS for Controller (MIC) 1 , valid at T

A

= 25°C, V

CC

= 20 V, unless otherwise specified

Power Supply Start-up Operation

Operation Start Voltage

Operation Stop Voltage

Circuit Current In Operation

Circuit Current In Non-Operation

Oscillation Frequency

Soft Start Operation Stop Voltage

Soft Start Operation Charging Current

V

V

CC(ON)

CC(OFF)

I

CC(ON)

I

CC(OFF) f osc

V

SSOLP(SS)

I

SSOLP(SS)

V

CC

= 0 20 V

V

CC

= 20 8.8 V

V

V

V

CC

= 15 V

SS/OLP

SS/OLP

increasing

= 0 V

16.3

8.8

19

1.1

–710

18.2

9.7

22

1.2

–550

Normal Operation

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

FB Terminal Inflow Current (Normal Operation)

V

OCPBD(BS1)

V

OCPBD(BS2)

V

OCPBD(LIM)

I

OCPBD

V

OCPBD(TH1)

V

OCP/BD

falling

V

OCP/BD

= –0.95 V

V

OCP/BD

falling

V

OCPBD(TH2)

V

FB(OFF)

I

FB(ON)

V

OCP/BD

rising

V

FB

rising

V

FB

= 1.6 V

–0.720

–0.485

–0.995

–250

0.28

0.67

1.32

600

–0.665

–0.435

–0.940

–100

0.40

0.80

1.45

1000

Max.

19.9

10.6

6

100

25

1.4

–390

–0.605

–0.385

–0.895

–40

0.52

0.93

1.58

1400

Units

V

V

V

V

V

μA

V

V

V

μA mA

μA kHz

V

μA

Standby Operation

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 t

V

CC(S)

V

I

CC(SK)

CC(S)

I

FB(S)

V

FB(S)

ON(MIN)

V

CC

V

CC

V

CC

V

CC

= 0 15 V, V

FB

V

CC(SK)

= V

CC(S)

– V

= 10.2 V, V

FB

= 10.2 V, V

FB

= 15 V, V

FB

= 1.6 V

CC(OFF)

= 1.6 V

= 1.6 V

rising

10.3

1.10

0.55

0.65

11.2

1.35

20

4

1.10

1.00

12.1

1.65

56

14

1.50

1.35

V

Protection Operation

Maximum On Time

Overload Protection Operation Threshold Voltage

Overload Protection Operation Charging Current

Overvoltage Protection Operation Voltage

Latch Circuit Holding Current

Latch Circuit Release Voltage

2

2 t

ON(MAX)

V

SSOLP(OLP)

I

SSOLP(OLP)

V

CC(OVP)

I

CC(H)

V

CC(La.OFF)

V

SS/OLP

= 2.5 V

V

CC

= 0 30 V

V

CC(OFF)

– 0.3 V

V

CC

= 30 6 V, OVP operating

27.5

4.0

–16

25.5

6.0

32.5

4.9

–11

27.7

45

7.2

39.0

5.8

–6

29.9

140

8.5

ELECTRICAL CHARACTERISTICS for MOSFET , valid at T

A

= 25°C, unless otherwise specified

Drain-to-Source Breakdown Voltage

Drain Leakage Current

On Resistance R

V

I

DSS

DSS

DS(on)

I

DSS

= 300

μA

V

DSSS

= 650 V

I

DS

= 3.4 A

650

300

0.62

Switching Time

Thermal Resistance t f

R ch-F

Channel to internal frame

500

1.09

°C/W

1 Current polarity with respect to the IC: positive current indicates current sink at the terminal named, negative current indicates source at the terminal named.

2 The latch circuit means a circuit operated OVP and OLP.

V

μA

Ω ns

μs

V

μA

V

μA

V

V

μA

μA

V

μs

6

STRX6757DS

SANKEN ELECTRIC CO., LTD.

STR-X6757 Off-Line Quasi-Resonant Switching Regulators

Gate Burr

15.6 ±0.2

6

Package Outline Drawing, TO-3P

5.5±0.2

3.45±0.2

Branding

Area

XXXXXXXX

XXXXXXXX

XXXXXXXX

3.35±0.1

0.55

+0.2

–0.1

View A

2X 2.54±0.1

4X 1.27±0.1

Terminal dimension at lead tip

1

2 3

4

5 7

6

4.3 ±0.5

3.6 ±0.5

Terminal dimension at lead tip

1.33

+0.2

–0.1

2X 0.83

+0.2

–0.1

1.89

+0.2

–0.1

Enlargement View A

5X 0.75

+0.2

–0.1

5X 0.65

+0.2

–0.1

0.5

0.5

Front View (Plan View)

Gate burr: 0.3 mm (max.)

Terminal core material: Cu

Drawing for reference only

Branding codes (exact appearance at manufacturer discretion):

Terminal treatment: Ni plating and Pb-free solder dip

Leadform: 1905

Approximate weight: 6 g

Dimensions in millimeters

1st line, type: STR

2nd line, subtype: X6757

3rd line, lot: YM DD

Where: Y is the last digit of the year of manufacture

M is the month ( 1 to 9, O, N, D )

DD is the 2-digit date

Leadframe plating Pb-free. Device composition includes high-temperature solder (Pb >85%), which is exempted from the RoHS directive.

STRX6757DS

SANKEN ELECTRIC CO., LTD.

7

STR-X6757 Off-Line Quasi-Resonant Switching Regulators

Because reliability can be affected adversely by improper storage environments and handling methods, please observe the following cautions.

Cautions for Storage

• 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 the products that have been stored for a long time.

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 the product pins, and wrong connections. Ensure all test parameters are within the ratings specified by Sanken for the products.

Remarks About Using Silicone Grease with a Heatsink

• When silicone grease is used in mounting the products on a heatsink, it shall be applied evenly and thinly. If more silicone grease than required is applied, it may produce excess stress.

• Volatile-type silicone greases may crack after long periods of time, resulting in reduced heat radiation effect. Silicone greases with low consistency (hard grease) may cause cracks in the mold resin when screwing the products to a heatsink.

Our recommended silicone greases for heat radiation purposes, which will not cause any adverse effect on the product life, are indicated below:

Type

G746

YG6260

SC102

Suppliers

Shin-Etsu Chemical Co., Ltd.

Momentive Performance Materials Inc.

Dow Corning Toray Co., Ltd.

Cautions for Mounting to a Heatsink

• When the flatness around the screw hole is insufficient, such as when mounting the products to a heatsink that has an extruded (burred) screw hole, the products can be damaged, even with a lower than recommended screw torque. For mounting the products, the mounting surface flatness should be 0.05 mm or less.

• Please select suitable screws for the product shape. Do not use a flat-head machine screw because of the stress to the products. Self-tapping screws are not recommended. When using self-tapping screws, the screw may enter the hole diagonally, not vertically, depending on the conditions of hole before threading or the work situation. That may stress the products and may cause failures.

• Recommended screw torque: 0.588 to 0.785 N m (6 to 8 kgf cm).

• For tightening screws, if a tightening tool (such as a driver) hits the products, the package may crack, and internal stress fractures may occur, which shorten the lifetime of the electrical elements and can cause catastrophic failure.

Tightening with an air driver makes a substantial impact.

In addition, a screw torque higher than the set torque can be applied and the package may be damaged. Therefore, an electric driver is recommended.

When the package is tightened at two or more places, first pre-tighten with a lower torque at all places, then tighten with the specified torque. When using a power driver, torque control is mandatory.

Soldering

• When soldering the products, please be sure to minimize the working time, within the following limits:

260±5°C 10±1 s (Flow, 2 times)

380±10°C 3.5±0.5 s (Soldering iron, 1 time)

• Soldering should be at a distance of at least 2.0 mm from the body of the products.

Electrostatic Discharge

• When handling the products, the operator must be grounded. Grounded wrist straps worn should have at least 1 M

Ω of resistance from the operator to ground to prevent shock hazard, and it should be placed near the operator.

• Workbenches where the products are handled should be grounded and be provided with conductive table and floor mats.

• When using measuring equipment such as a curve tracer, the equipment should be grounded.

• When soldering the products, the head of soldering irons or the solder bath must be grounded in order to prevent leak voltages generated by them from being applied to the products.

• The products should always be stored and transported in

Sanken shipping containers or conductive containers, or be wrapped in aluminum foil.

8

STRX6757DS

SANKEN ELECTRIC CO., LTD.

STR-X6757 Off-Line Quasi-Resonant Switching Regulators

• The contents in this document are subject to changes, for improvement and other purposes, without notice. Make sure that this is the latest revision of the document before use.

• Application and operation examples described in this document are quoted for the sole purpose of reference for the use of the products herein and Sanken can assume no responsibility for any infringement of industrial property rights, intellectual property rights or any other rights of Sanken or any third party which may result from its use.

• 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 the society due to device failure or malfunction.

• Sanken products listed in this document are designed and intended for the use as components in general purpose electronic equipment or apparatus (home appliances, office equipment, telecommunication equipment, measuring equipment, etc.).

When considering the use of Sanken products in the applications where higher reliability is required (transportation equipment and its control systems, traffic signal control systems or equipment, fire/crime alarm systems, various safety devices, etc.), and whenever long life expectancy is required even in general purpose electronic equipment or apparatus, please contact your nearest Sanken sales representative to discuss, prior to the use of the products herein.

The use of Sanken products without the written consent of Sanken in the applications where extremely high reliability is required

(aerospace equipment, nuclear power control systems, life support systems, etc.) is strictly prohibited.

• In the case that you use Sanken products or design your products by using Sanken products, the reliability largely depends on the degree of derating to be made to the rated values. Derating may be interpreted as a case that an operation range is set by derating the load from each rated value or surge voltage or noise is considered for derating in order to assure or improve the reliability. In general, derating factors include electric stresses such as electric voltage, electric current, electric power etc., environmental stresses such as ambient temperature, humidity etc. and thermal stress caused due to self-heating of semiconductor products. For these stresses, instantaneous values, maximum values and minimum values must be taken into consideration.

In addition, it should be noted that since power devices or IC's including power devices have large self-heating value, the degree of derating of junction temperature affects the reliability significantly.

• When using the products specified herein by either (i) combining other products or materials therewith or (ii) physically, chemically or otherwise processing or treating the products, please duly consider all possible risks that may result from all such uses in advance and proceed therewith at your own responsibility.

• Anti radioactive ray design is not considered for the products listed herein.

• Sanken assumes no responsibility for any troubles, such as dropping products caused during transportation out of Sanken's distribution network.

• The contents in this document must not be transcribed or copied without Sanken's written consent.

9

STRX6757DS

SANKEN ELECTRIC CO., LTD.

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