STR-S6707 THRU
STR-S6709
OFF-LINE SWITCHING REGULATORS
– WITH BIPOLAR SWITCHING TRANSISTOR
The STR-S6707, STR-S6708, and STR-S6709 are specifically
designed to meet the requirement for increased integration and reliabil-
ity in off-line quasi-resonant flyback converters. These devices incorpo-
rate the primary control and proportional drive circuit with a third-
1
2
COLLECTOR
COMMON
BASE
generation high-voltage bipolar switching transistor.
FAULT
3
4
5
6
7
S
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.
FAULT
LATCH
DRIVE
OSC.
SINK
R
DRIVE
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
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.
+
REF.
FDBK
+
INHIBIT
8
9
UVLO
V
IN
Dwg. PK-001
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VIN ........................... 15 V
Proven in substantial volumes, these devices and their fixed-
frequency counterparts represent a significant advance in off-line SMPS
reliability growth and integration.
Output Voltage, VCEX ....................... 850 V
VEBO ................................................ 7 V
Continuous Output Current,
FEATURES
IC .......................................... See Table
1 ms Single-Pulse Output Current,
I Quasi-Resonant Operation for Low EMI and High Efficiency
I Output Power to 220 W
ICM ........................................ See Table
Sink Current, IS......................... See Table
Drive Current, ID .......................... -700 mA
Feedback Current, IFDBK ................. 20 mA
Inhibit Voltage, VINH ........................... 15 V
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
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
Always order by complete part number:
Max. Cont.
Current, IC
Peak
Current, ICM
Max. Sink
Current, IS
Part Number
Operating Temperature Range,
TA ............................... -20°C to +125°C
Storage Temperature Range,
STR-S6707
STR-S6708
STR-S6709
6 A
7.5 A
10 A
12 A
15 A
20 A
1.5 A
1.5 A
2 A
Tstg ............................. -40°C to +125°C
™
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