Datasheet STRS5708, STRS5707 Datasheet (Allegro)

The STR-S5707 and STR-S5708 are specifically designed to meet
the requirement for increased integration and reliability in off-line quasi­resonant flyback converters with indirect feedback. Each device
incorporates the primary control and proportional drive circuit with a
third-generation 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
primary-side error amplifier with reference is included to facilitate
regulation from an auxiliary or bias winding of the power transformer. 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, this device and its fixed-frequency
counterparts represents a significant advance in off-line SMPS reliability
growth and integration.

FEATURES

■ Quasi-Resonant Operation for Low EMI and High Efficiency

■ Low-Power Output Standby Mode

■ Indirect Feedback from Auxiliary Winding

Reduces External Component Count

■ 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:

Part Output Current Output Power, P

O

Number Continuous, ICPeak, I

CM

Wide AC In 220/240 VAC In

STR-S5707 6 A 12 A 90 W 140 W
STR-S5708 7.5 A 15 A 120 W 180 W

Data Sheet

28114A*

OFF-LINE SWITCHING REGULATORS

– WITH BIPOLAR SWITCHING TRANSISTOR

+

OVER-CURRENT

PROTECTION

BASE

COLLECTOR

UVLO

COMMON

V

IN

Dwg. PK-004

INHIBIT

FAULT
LATCH

REF.

1

2

3

4

5

6

7

OSC.

R

S

FAULT

8

9

SINK

DRIVE

+

DRIVE

32 V SENSE

+

ABSOLUTE MAXIMUM RATINGS

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

Output Voltage, V

CEX

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

V

EBO

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

Continuous Output Current,

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

1 ms Single-Pulse Output Current,

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

Sink Current, IS................................. 1.5 A

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

Inhibit Voltage, V

INH

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

Over-Current Protection Voltage Range,

V

OCP

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

Insulation Voltage,V

WM(RMS)

........... 2000 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

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

™

STR-S5707

AND

STR-S5708

STR-S5707

AND

STR-S5708

OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS

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

™

FUNCTIONAL BLOCK DIAGRAM

ALLOWABLE PACKAGE POWER DISSIPATION MAXIMUM SAFE OPERATING AREA

60

40

20

20 60 100

3.2 W

140

LIMITED BY FRAME
TEMP. = +125°C MAX.

RECOMMENDED MAX.
FRAME TEMP. = +100°C

FREE AIR

54 W

0

TEMPERATURE in °C

ALLOWABLE PACKAGE POWER DISSIPATION in WATTS

MOUNTING SURFACE
TEMPERATURE

Dwg. GK-003-2

PROPORTIONAL

DRIVE

TSD

OVER-VOLT.

PROTECT

OSC.

R

S

Q

V

IN

SENSE

7

OVER-CURRENT
PROTECTION

COMMON

COLLECTOR

BASE

SINK

DRIVE

3300 pF

1 kΩ

R

ton

R

toff

0.75 V

-1 V

1.4 V

5.1 V

REF.

FAULT
LATCH

+

+

+

+

INHIBIT

9

6

8

4

3

1

2

5

Dwg. FK-001-1

UVLO

1500 pF

30

3.0

0.3

COLLECTOR-EMITTER VOLTAGE in VOLTS

COLLECTOR CURRENT in AMPERES

Dwg. GK-002-1A

1.0

10

0 200 400 600 1000

0.5

5.0

800

STR-S5708 (15 A)

STR-S5707 (12 A)

L = 6 mH
I

B1

= 2.5 A

I

B2

= 0.8 A

t

on

= 100 µs

dc < 1%

Copyright © 1994 Allegro MicroSystems, Inc.

www.allegromicro.com

STR-S5707

AND

STR-S5708

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATORS

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

INT

Turn-on, increasing V

IN

7.6 8.0 8.4 V

Under-Voltage Lockout V

INQ

Turn-off, decreasing V

IN

4.6 4.9 5.2 V

Over-Voltage Threshold V

OVP(th)

9.2 – 10.7 V

Output Leakage Current I

CEX

VCE = 850 V, VBE = -1.5 V ––100 µA

Output Saturation Voltage V

CE(sat)

STR-S5707, IC = 2 A, IB = 400 mA ––400 mV

STR-S5708, IC = 3 A, IB = 600 mA ––400 mV

V

BE(sat)

STR-S5707, IC = 2 A, IB = 400 mA ––1.5 V

STR-S5708, IC = 3 A, IB = 600 mA ––1.5 V

DC Current Gain h

FE

VCE = 4 V, IC = 1 A 29 – 61 –

Maximum ON Time t

on

33 – 41 µs

Minimum OFF Time t

off

45 – 55 µs

Over-Current Threshold V

OCP(th)

-0.88 -1.0 -1.12 V

Sense Voltage V

SENSE

I

SENSE

= 3.2 mA 31.7 32.0 32.3 V

Inhibit Threshold Voltage V

INH(th)

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 5.8 V

Latch Holding Current I

INH

VIN reduced from 10.7 V to 4 V ––500 µA

Latch Reset Voltage V

Q

IIN ≤ 100 µA, VIN reduced from 10.7 V 2.5 3.1 – V

Ref. Voltage Temp. Coeff. α

VZ

-20°C ≤ TF ≤ +100°C, IIN = 3.2 mA – 2.5 – mV/°C

Supply Current I

IN(ON)

Operating 15 – 28 mA

I

IN(OFF)

––200 µA

Insulation RMS Voltage V

WM(RMS)

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

Thermal Shutdown T

J

125 150 – °C

Thermal Resistance R

θJM

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

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

Typical Data is for design information only.

STR-S5707

AND

STR-S5708

OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS

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

™

100

10

1.0

COLLECTOR CURRENT in AMPERES

DC CURRENT GAIN

Dwg. GK-001-2

3.0

30

0.01 0.1 1.0 10 100

5.0

50

0.03 0.3 3.0 30

V = 4 V

CE

STR-S5708

STR-S5707

TYPICAL CHARACTERISTICS

www.allegromicro.com

STR-S5707

AND

STR-S5708

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATORS

TYPICAL QUASI-RESONANT FLYBACK CONVERTER

WARNING: lethal potentials are present. See below.

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.

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

FULL-BRIDGE

RECTIFIER

AC INPUT

+

+

+ OUTPUT

– OUTPUT

+

Dwg. EK-005A

+

+

R

SQ

7

+

+

+

+

9

6

8

4

3

1

2

5

★

STR-S5707

AND

STR-S5708

OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS

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

™

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

0.276

±0.016

Dwg. MK-003-9 in

0.953 ±0.008

0.610

±0.008

0.118

0.130

±0.008

ø

1.49 ±0.012

0.016

0.100

±0.004

0.709 ±0.008

0.216

±0.008

0.216

0.130

±0.004

0.026

+0.008
–0.004

0.177

±0.028

PACKAGE

CENTER

LEAD
CENTER

1

9

0.033

+0.008
–0.004

T REF.

M

Dimensions in Inches

(for reference only)

www.allegromicro.com

STR-S5707

AND

STR-S5708

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATORS

Dimensions in Millimeters

(controlling dimensions)

Dwg. MK-003-9 mm

24.2

±0.2

15.5

±0.2

3.0

3.3

±0.2

ø

23.0

±0.3

0.4

2.54

±0.1

18.0

±0.2

5.5

±0.2

7.0

±0.4

5.5

3.3

±0.1

0.65

+0.2
–0.1

4.5

±0.7

PACKAGE

CENTER

LEAD
CENTER

1

9

0.85

+0.2
–0.1

T REF

M

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

STR-S5707

AND

STR-S5708

OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS

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

™

SWITCHING REGULATOR PMCMs

Part

Number* Application V

I

Max P

O

Power Switch

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

220/240V 140 W

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

220/240 V 180 W

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

220/240 V 140 W

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

220/240 V 180 W

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

220/240 V 220 W

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

* 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.