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S6707

OFF-LINE SWITCHING REGULATORS – WITH BIPOLAR SWITCHING TRANSISTOR

Allegro MicroSystems 

STR-S6703 AND

STR-S6704

OFF-LINE SWITCHING REGULATORS

– WITH BIPOLAR SWITCHING TRANSISTOR

COLLECTOR 1

COMMON 2

BASE 3

SINK 4

DRIVE 5

OVER-CURRENT

PROTECTION

6

FDBK 7

INHIBIT 8

VIN 9

DRIVE

OSC.

FAULT

S

FAULT

LATCH

R

REF.

UVLO

Dwg. PK-001

ABSOLUTE MAXIMUM RATINGS

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

Output Voltage, VCEX ....................... 500 V

VEBO ................................................ 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

Feedback Current, IFDBK ................. 20 mA

Inhibit Voltage, VINH ........................... 15 V

Over-Current Protection Voltage Range,

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

Insulation Voltage,VWM(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,

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

The STR-S6703 and STR-S6704 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 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 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

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.

Proven in substantial volumes, these devices and their fixed-

frequency counterparts represent a significant advance in off-line SMPS

reliability growth and integration. Similar devices, with an output

voltage rating of 850 V and output power ratings to 220 W, are available

as the STR-S6707 thru STR-S6709.

FEATURES

I Quasi-Resonant Operation for Low EMI and High Efficiency

I Output Power to 140 W

I Low-Power Output Standby Mode

I Pulse-by-Pulse Over-Current Protection

I Latched Over-Voltage and Thermal Protection

I Third-Generation Switching Transistor with Proportional Drive

I Maximum ON Time and OFF Time Set During Manufacture

I Internal Under-Voltage Lockout with Hysteresis

I Over-Molded SIP with Integral Isolated Heat Spreader

Always order by complete part number:

Part Number

Max. Cont.

Current, IC

Peak

Current, ICM

STR-S6703

6A

STR-S6704

5A

12 A

10 A

™

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