Electronico

Data Sheet
28113†

STR-S6707 THRU
STR-S6709

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

V IN

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.

9

FAULT

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.

S
DRIVE

OSC.

FAULT
LATCH

R

+
REF.

+
UVLO

Dwg. PK-001

ABSOLUTEMAXIMUM RATINGS
Supply Voltage, VIN ........................... 15 V
Output Voltage, VCEX ....................... 850 V
VEBO ................................................ 7 V
Continuous Output Current,
IC .......................................... See Table
1 ms Single-Pulse Output Current,
ICM ........................................ See Table
Sink Current, IS ......................... See TableDrive 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 FrameTemperature, TF ... +125°C
Operating Temperature Range,
TA ............................... -20°C to +125°C
Storage Temperature Range,
Tstg ............................. -40°C to +125°C

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 andthermal 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 lowtransient 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
I
I
I
I
I
I
I
I
I

Quasi-Resonant Operation for Low EMI and High Efficiency
Output Power to 220W
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
Part NumberCurrent, IC
Current, ICM
STR-S6707
STR-S6708
STR-S6709

™

6A
7.5 A
10 A

12 A
15 A
20 A

Max. Sink
Current, IS
1.5 A
1.5 A
2A

STR-S6707 THRU STR-S6709
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
STR-S6707 AND STR-S6708 FUNCTIONAL BLOCK DIAGRAM
V IN

INHIBIT
8

9

R

UVLO
OVER-VOLT.
PROTECT

FAULT
LATCH

PROPORTIONAL
DRIVE

SINK

BASE

1

COLLECTOR

2

COMMON

6

1 kΩ

DRIVE

3

Q

5

4S
REF.

OVER-CURRENT
PROTECTION

0.7 Ω

TSD
OSC.

Rton
+
0.75 V
+
FDBK

7
3300 pF

1.4 V

Rtoff

-1 V

+

+
5.1 V

Dwg. FK-001

ALLOWABLE PACKAGE POWER DISSIPATION

MAXIMUM SAFE OPERATING AREA
30
STR-S6709 (20 A)

54 W

MOUNTING SURFACE
TEMPERATURE

STR-S6708 (15 A)
STR-S6707 (12 A)

RECOMMENDED MAX.
FRAME TEMP. = +100°C

40

LIMITED BY FRAME
TEMP. = +125°C MAX.
20

COLLECTOR CURRENT in AMPERES...