STR-S5707.pdf

STR-S5707 AND

OFF-LINE SWITCHING REGULATORS

– WITH BIPOLAR SWITCHING TRANSISTOR

COLLECTOR

The STR-S5707 and STR-S5708 are specifically designed to meet

the requirement for increased integration and reliability in off-line quasi-

resonant flyback converters with indirect feedback. Each device

incorporates the primary control and proportional drive circuit with a

third-generation high-voltage bipolar switching transistor.

COMMON

FAULT

BASE

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.

SINK

DRIVE

OSC.

FAULT

LATCH

OVER-CURRENT

PROTECTION

Cycle-by-cycle current limiting, under-voltage lock-out with hyster-

esis, 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 over-

molded single-in-line power package.

INHIBIT

32 V SENSE

REF.

DRIVE

UVLO

V IN

Dwg. PK-004

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, V IN ........................... 15 V

Output Voltage, V CEX ....................... 850 V

V EBO ................................................ 7 V

Continuous Output Current,

I C .......................................... See Table

1 ms Single - Pulse Output Current,

I CM ........................................ See Table

Sink Current, I S ................................. 1.5 A

Drive Current, I D .......................... -700 mA

Inhibit Voltage, V INH ........................... 15 V

Over-Current Protection Voltage Range,

V OCP ............................................

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

3.5 V

Insulation Voltage,V WM(RMS) ........... 2000 V

Package Power Diss., P D ........ See Graph

Output Junction Temperature, T J .. +150

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

Internal Frame Temperature, T F ... +125

Always order by complete part number:

Part

Operating Temperature Range,

T A ............................... -20

C to +125

Output Current

Output Power, P O

Number

Continuous, I C

Peak, I CM

Wide AC In 220/240 VAC In

Storage Temperature Range,

T stg ............................. -40

C to +125

STR-S5707

6 A

12 A

90 W

140 W

STR-S5708

7.5 A

15 A

120 W

180 W

™

STR-S5708

STR-S5707 AND STR-S5708

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATORS

FUNCTIONAL BLOCK DIAGRAM

V IN

INHIBIT

UVLO

SENSE 7

OVER-VOLT .

PROTECT

FAULT

LATCH

PROPORTIONAL

DRIVE

1 k

Ω

DRIVE

REF .

SINK

TSD

OSC .

BASE

R ton

1500 pF

COLLECTOR

0.75 V

COMMON

33 00 pF

R toff

1.4 V

-1 V

OVER-CURRENT

PROTECTION

5.1 V

Dwg. FK-001-1

ALLOWABLE PACKAGE POWER DISSIPATION

MAXIMUM SAFE OPERATING AREA

54 W

MOUNTING SURFACE

TEMPERATURE

STR-S5708 (15 A)

STR-S5707 (12 A)

RECOMMENDED MAX.

FRAME TEMP. = +100

5.0

3.0

LIMITED BY FRAME

TEMP. = +125

C MAX.

L = 6 mH

I B1 = 2.5 A

I B2 = 0.8 A

t on = 100

dc < 1%

1.0

FREE AIR

0.5

3.2 W

0.3

100

140

200

400

600

800

1000

TEMPERATURE in

COLLECTOR-EMITTER VOLTAGE in VOLTS

Dwg. GK-003-2

Dwg. GK-002-1A

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

™

STR-S5707 AND STR-S5708

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATORS

C, V IN = 8.5 V, voltage measurements are refer-

enced 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

Under-Voltage Lockout

V INQ

Turn-off, decreasing V IN

4.6 4.9 5.2

Over-Voltage Threshold

V OVP(th)

9.2 – 10.7

Output Leakage Current

I CEX

V CE = 850 V, V BE = -1.5 V

– – 100

Output Saturation Voltage

V CE(sat)

STR-S5707, I C = 2 A, I B = 400 mA

– – 400

STR-S5708, I C = 3 A, I B = 600 mA

– – 400

V BE(sat)

STR-S5707, I C = 2 A, I B = 400 mA

– – 1.5

STR-S5708, I C = 3 A, I B = 600 mA

– – 1.5

DC Current Gain

h FE

V CE = 4 V, I C = 1 A

29 – 61

–

Maximum ON Time

t on

33 – 41

Minimum OFF Time

t off

45 – 55

Over-Current Threshold

V OCP(th)

-0.88 -1.0 -1.12

Sense Voltage

V SENSE

I SENSE = 3.2 mA

31.7 32.0 32.3

Inhibit Threshold Voltage

V INH(th)

Oscillation stops

0.65 0.75 0.85

Oscillation synchronized

– 1.4 2.0

Oscillation stops (fault latch set)

3.2 5.1 5.8

Latch Holding Current

I INH

V IN reduced from 10.7 V to 4 V

– – 500

Latch Reset Voltage

V Q

I IN

≤

100

A, V IN reduced from 10.7 V

2.5 3.1 –

Ref. Voltage Temp. Coeff.

α VZ

-20

≤

T F

≤

+100

C, I IN = 3.2 mA

– 2.5 – mV/

Supply Current

I IN(ON)

Operating

15 – 28

I IN(OFF)

– – 200

Insulation RMS Voltage

V WM(RMS)

All terminals simultaneous reference

2000 – –

metal plate against backside

Thermal Shutdown

T J

125 150 –

Thermal Resistance

θ JM

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.

www.allegromicro.com

ELECTRICAL CHARACTERISTICS at T A = +25

STR-S5707 AND STR-S5708

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATORS

TYPICAL CHARACTERISTICS

100

V = 4 V

STR-S5708

STR-S5707

5.0

3.0

1.0

0.01

0.03

0.1

0.3

1.0

3.0

100

COLLECTOR CURRENT in AMPERES

Dwg. GK-001-2

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

™

STR-S5707 AND STR-S5708

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATORS

TYPICAL QUASI-RESONANT FLYBACK CONVERTER

WARNING: lethal potentials are present. See below.

+ OUTPUT

– OUTPUT

Dwg. EK-005A

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

www.allegromicro.com

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