Datasheet STRS6708, STRS6709, STRS6707 Datasheet (Allegro)

– WITH BIPOLAR SWITCHING TRANSISTOR

COLLECTOR

OVER-CURRENT

PROTECTION

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, VIN........................... 15 V

Output Voltage, V

V

EBO

Continuous Output Current,

IC.......................................... See Table

1 ms Single-Pulse Output Current,

ICM........................................ See Table

Sink Current, IS......................... See Table

Drive Current, ID.......................... -700 mA

Feedback Current, I

Inhibit Voltage, V

Over-Current Protection Voltage Range,

V

OCP

Insulation Voltage,V

Package Power Diss., PD........ See Graph

Output Junction Temperature, TJ.. +150°C

Internal Frame Temperature, TF... +125°C

Operating Temperature Range,

TA............................... -20°C to +125°C

Storage Temperature Range,

T

stg

1

2

COMMON

BASE

SINK

DRIVE

FDBK

INHIBIT

3

4

5

6

7

8

V

9

IN

DRIVE

+

+

....................... 850 V

CEX

OSC.

FAULT

FAULT
LATCH

S

R

REF.

UVLO

Dwg. PK-001

................................................ 7 V

................. 20 mA

FDBK

........................... 15 V

INH

............................................ ±3.5 V

WM(RMS)

........... 2000 V

............................. -40°C to +125°C

STR-S6707 THRU

28113†

STR-S6709

OFF-LINE SWITCHING REGULATORS

The STR-S6707, STR-S6708, and STR-S6709 are specifically
designed to meet the requirement for increased integration and reliabil­ity in off-line quasi-resonant flyback converters. These devices incorpo­rate the primary control and proportional drive circuit with a third­generation high-voltage bipolar switching transistor.

Crucial system parameters such as maximum ON time and OFF
time are fixed during manufacture. Local control circuit decoupling and
layout are optimized within each device.

Cycle-by-cycle current limiting, under-voltage lock-out with hyster­esis, over-voltage protection, and thermal shutdown protect these
devices during all normal and overload conditions. Over-voltage
protection and thermal shutdown are latched after a short delay. A
versatile triple-level inhibit circuit includes the OFF time synchronization
required to establish quasi-resonant operation. The inhibit function has
also been expanded to initiate operation in stand-by mode in which the
power supply delivers a small fraction of the steady-state output power.
The dual requirements of dielectric isolation and low transient thermal
impedance and steady-state thermal resistance are satisfied in an over­molded single-in-line power package.

Proven in substantial volumes, these devices and their fixed­frequency counterparts represent a significant advance in off-line SMPS
reliability growth and integration.

FEATURES

■ Quasi-Resonant Operation for Low EMI and High Efficiency

■ Output Power to 220 W

■ Low-Power Output Standby Mode

■ Pulse-by-Pulse Over-Current Protection

■ Latched Over-Voltage and Thermal Protection

■ Third-Generation Switching Transistor with Proportional Drive

■ Maximum ON Time and Off Time Set During Manufacture

■ Internal Under-Voltage Lockout with Hysteresis

■ Over-Molded SIP with Integral Isolated Heat Spreader

Always order by complete part number:

Max. Cont. Peak Max. Sink

Part Number Current, I

C

STR-S6707 6 A 12 A 1.5 A
STR-S6708 7.5 A 15 A 1.5 A
STR-S6709 10 A 20 A 2 A

Current, I

CM

Current, I

S

Data Sheet

™

STR-S6707 THRU STR-S6709

OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS

STR-S6707 AND STR-S6708 FUNCTIONAL BLOCK DIAGRAM

FDBK

V

IN

9

UVLO

OVER-VOLT.

PROTECT

REF.

R

S

FAULT
LATCH

Q

TSD

OSC.

R

ton

+

INHIBIT

8

PROPORTIONAL

DRIVE

1 kΩ

0.7 Ω

DRIVE

5

SINK

4

3

BASE

1

COLLECTOR

0.75 V

7

3300 pF

R

toff

+

1.4 V

+

-1 V

2

COMMON

OVER-CURRENT

6

PROTECTION

+

5.1 V

Dwg. FK-001

ALLOWABLE PACKAGE POWER DISSIPATION MAXIMUM SAFE OPERATING AREA

30

60

54 W

40

20

3.2 W

ALLOWABLE PACKAGE POWER DISSIPATION in WATTS

0

20 60 100

MOUNTING SURFACE
TEMPERATURE

FREE AIR

RECOMMENDED MAX.
FRAME TEMP. = +100°C

TEMPERATURE in °C

LIMITED BY FRAME
TEMP. = +125°C MAX.

140

Dwg. GK-003-2

10

5.0

3.0

1.0

COLLECTOR CURRENT in AMPERES

0.5

0.3
0 200 400 600 1000

STR-S6709 (20 A)

STR-S6708 (15 A)

STR-S6707 (12 A)

L = 6 mH
I

B1

= 2.5 A (STR-S6707/08) or 3 A (STR-S6709)

I

B2

= 0.8 A (STR-SA6707/08) or 1.2 A (STR-S6709)

t

on

= 100 µs

dc < 1%

COLLECTOR-EMITTER VOLTAGE in VOLTS

800

Dwg. GK-002

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

Copyright © 1994 Allegro MicroSystems, Inc.

™

STR-S6707 THRU STR-S6709

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATORS

STR-S6709

SINK

FUNCTIONAL BLOCK DIAGRAM

AS ABOVE

20 Ω

4

EXCEPT FOR SINK OUTPUT

ELECTRICAL CHARACTERISTICS at TA = +25°C, VIN = 8.5 V, voltage measurements are refer­enced to Common (pin 2) (unless otherwise noted).

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

On-State Voltage V
Under-Voltage Lockout V
Over-Voltage Threshold V
Output Leakage Current I
Output Saturation Voltage V

DC Current Gain h
Maximum ON Time t
Minimum OFF Time t
Over-Current Threshold V
Feedback Threshold Volt. V
Inhibit Threshold Voltage V

Latch Holding Current I
Latch Reset Voltage V
Supply Current I

Insulation RMS Voltage V

Thermal Shutdown T
Thermal Resistance R

INT

INQ

OVP(th)

CEX

CE(sat)

V

BE(sat)

FE

on

off

OCP(th)

FDBK(th)

INH(th)

INH

Q

IN(ON)

I

IN(OFF)

WM(RMS)

J

θJM

NOTES: Negative current is defined as coming out of (sourcing) the specified device terminal.

Typical Data is for design information only.

Turn-on, increasing V
Turn-off, decreasing V

IN

IN

7.6 8.0 8.4 V

4.6 4.9 5.2 V

9.2 – 10.7 V
VCE = 850 V, VBE = -1.5 V ––100 µA
STR-S6707, IC = 2 A, IB = 400 mA ––400 mV
STR-S6708, IC = 3 A, IB = 600 mA ––400 mV
STR-S6709, IC = 4 A, IB = 800 mA ––400 mV
STR-S6707, IC = 2 A, IB = 400 mA ––1.5 V
STR-S6708, IC = 3 A, IB = 600 mA ––1.5 V
STR-S6709, IC = 4 A, IB = 800 mA ––1.5 V
VCE = 4 V, IC = 1 A 29 – 61 –

33 – 41 µs
45 – 55 µs

-0.9 -1.0 -1.1 V
– 650 – mV

Oscillation stops 0.65 0.75 0.85 V
Oscillation synchronized – 1.4 2.0 V
Oscillation stops (fault latch set) 3.2 5.1 5.6 V
VIN reduced from 10.7 V to 4 V ––500 µA
IIN ≤ 100 µA, VIN reduced from 10.7 V 2.5 3.1 – V
Operating 15 – 29 mA

––200 µA

All terminals simultaneous reference 2000 –– V
metal plate against backside

125 150 – °C

Output junction to mounting surface – 2.0 – °C/W

www.allegromicro.com

STR-S6707 THRU STR-S6709

OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS

TYPICAL CHARACTERISTICS

100

50

30

10

DC CURRENT GAIN

5.0

V = 4 V

CE

STR-S6709

STR-S6708

STR-S6707

3.0

1.0

0.01 0.1 1.0 10 100

0.03 0.3 3.0 30

COLLECTOR CURRENT in AMPERES

Dwg. GK-001

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

™

STR-S6707 THRU STR-S6709

QUASI-RESONANT FLYBACK

SWITCHING REGULATORS

TYPICAL QUASI-RESONANT FLYBACK CONVERTER

WARNING: lethal potentials are present. See text.

OFF-LINE

AC INPUT

100 V/120 V

+

+

+

VOLTAGE

+

RECTIFIER

FULL-BRIDGE

9

+

7

R

SQ

8

5

4

3

+

+

+

+

1

2

6

★

APPLICATIONS INFORMATION

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.

+ OUTPUT

SENSE

– OUTPUT

Dwg. EK-004A

The use of an isolation transformer is recommended during circuit development and breadboarding.

Recommended mounting hardware torque:

4.34 – 5.79 lbf•ft (6 – 8 kg•cm or 0.588 – 0.784 Nm).

Recommended metal-oxide-filled, alkyl-degenerated oil base, silicone grease:

Dow Corning 340, or equivalent

www.allegromicro.com

STR-S6707 THRU STR-S6709

OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS

Dimensions in Inches

0.953

±0.008

0.610

±0.008

0.118

(for reference only)

T REF.

M

0.130

ø

±0.008

0.216

±0.008

±0.012

1.49

0.033

+0.008
–0.004

1

0.016

PACKAGE

CENTER

±0.008

0.709

0.276

±0.016

9

0.100

±0.004

0.177

±0.028

LEAD
CENTER

NOTE: Exact body and lead configuration at vendor’s option within limits shown.

Dwg. MK-003-9 in

0.130

±0.004

0.216

0.026

+0.008
–0.004

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

™

Dimensions in Millimeters

(controlling dimensions)

24.2

±0.2

T REF

15.5

3.0

±0.2

M

3.3

±0.2

STR-S6707 THRU STR-S6709

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATORS

ø

5.5

±0.2

±0.3

23.0

0.85

+0.2
–0.1

1

0.4

PACKAGE

CENTER

±0.2

18.0

7.0

±0.4

9

2.54

±0.1

LEAD
CENTER

NOTE: Exact body and lead configuration at vendor’s option within limits shown.

0.65

+0.2
–0.1

Dwg. MK-003-9 mm

3.3

±0.1

5.5

4.5

±0.7

www.allegromicro.com

STR-S6707 THRU STR-S6709

OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS

SWITCHING REGULATOR PMCMs

Part

Number* Application V

3002M 5 V switching regulator and a 7.0-33 V – – 500 mA bipolar

9 V switching regulator† – 400 mA bipolar

3004M 5 V switching regulator and 7.0-33 V – – 500 mA bipolar

Dual 9 V switching regulator – 2 x 400 mA bipolar

S5703 Quasi-resonant flyback converter 110/120 V 140 W 500 V 6 A bipolar

S5707 Quasi-resonant flyback converter 85-265 V 90 W 850 V 6 A bipolar

S5708 Quasi-resonant flyback converter 85-265 V 120 W 850 V 7.5 A bipolar

S6703 Quasi-resonant flyback converter 110/120V 140 W 500 V 6 A bipolar

S6704 Quasi-resonant flyback converter 110/120 V 100 W 500 V 5 A bipolar

S6707 Quasi-resonant flyback converter 85-265 V 90 W 850 V 6 A bipolar

S6708 Quasi-resonant flyback converter 85-265 V 120 W 850 V 7.5 A bipolar

S6709 Quasi-resonant flyback converter 85-265 V 160 W 850 V 10 A bipolar

8033S 3.3 V switching regulator 5.5-28 V – – 3 A bipolar

8050S 5.0 V switching regulator 7.0-40 V – – 3 A bipolar

8090S 9.0 V switching regulator 12-40V – – 3 A bipolar

8120S 12 V switching regulator 15-40 V – – 3 A bipolar

8150S 15 V switching regulator 18-40 V – – 3 A bipolar

I

220/240V 140 W

220/240 V 180 W

220/240 V 140 W

220/240 V 180 W

220/240 V 220 W

Max P

O

Power Switch

* Complete part number includes additional characters to indicate operating temperature range and/or package style.
† Also includes linear regulator output for 15.7 V at 1.0 A.
‡ Without heat sink.

The products described here are manufactured in Japan by Sanken Electric Co., Ltd. for

sale by Allegro MicroSystems, Inc.

Sanken Electric Co., Ltd. and Allegro MicroSystems, Inc. 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 their products.
Therefore, the user is cautioned to verify that the information in this publication is current
before placing any order.

These products are not authorized for use as critical components in life-support
appliances, devices, or systems without express written approval.

The information included herein is believed to be accurate and reliable. However,
Sanken Electric Co., Ltd. and Allegro MicroSystems, Inc. assume no responsibility for its
use; nor for any infringements of patents or other rights of third parties which may result
from its use.

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

™