DISCONTINUED PRODUCT
— FOR REFERENCE ONLY
Data Sheet
28113†
OFF-LINE SWITCHING REGULATORS
– WITH BIPOLAR SWITCHING TRANSISTOR
OSC.
+
+
OVER-CURRENT
PROTECTION
BASE
COLLECTOR
UVLO
COMMON
VIN
Dwg. PK-001
INHIBIT
FDBK
FAULT
LATCH
REF.
1
2
3
4
5
6
7
R
S
FAULT
8
9
SINK
DRIVE
DRIVE
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-
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.
FEATURES
■ Quasi-Resonant Operation for Low EMI and High Efficiency
■ Output Power to 220 W
■ 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 Max. Sink
Part Number Current, ICCurrent, ICM Current, IS
STR-S6707 6 A 12 A 1.5 A
STR-S6708 7.5 A 15 A 1.5 A
STR-S6709 10 A 20 A 2 A
ABSOLUTE MAXIMUM 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 Table
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
™
STR-S6707 THRU
STR-S6709
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
™
STR-S6707 THRU STR-S6709
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
STR-S6707 AND STR-S6708 FUNCTIONAL BLOCK DIAGRAM
ALLOWABLE PACKAGE POWER DISSIPATION MAXIMUM SAFE OPERATING AREA
PROPORTIONAL
DRIVE
TSD
OVER-VOLT.
PROTECT
OSC.
R
SQ
VIN
FDBK
OVER-CURRENT
PROTECTION
COMMON
COLLECTOR
BASE
SINK
DRIVE
3300 pF
1 kΩ
0.7 Ω
Rton
Rtoff
0.75 V
-1 V
1.4 V
5.1 V
REF.
FAULT
LATCH
+
+
+
+
INHIBIT
98
5
4
3
1
2
6
7
Dwg. FK-001
UVLO
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
30
3.0
0.3
COLLECTOR-EMITTER VOLTAGE in VOLTS
COLLECTOR CURRENT in AMPERES
Dwg. GK-002
1.0
10
0 200 400 600 1000
0.5
5.0
800
STR-S6709 (20 A)
STR-S6708 (15 A)
STR-S6707 (12 A)
L = 6 mH
I
B1
= 2.5 A (STR-S6707/08) or 3 A (STR-S6709)
I
B2
= 0.8 A (STR-SA6707/08) or 1.2 A (STR-S6709)
t
on
= 100 µs
dc < 1%
Copyright © 1994 Allegro MicroSystems, Inc.
STR-S6707 THRU STR-S6709
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
STR-S6709
FUNCTIONAL BLOCK DIAGRAM
AS ABOVE
EXCEPT FOR SINK OUTPUT
ELECTRICAL CHARACTERISTICS at TA = +25°C, VIN = 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 VINT Turn-on, increasing VIN 7.6 8.0 8.4 V
Under-Voltage Lockout VINQ Turn-off, decreasing VIN 4.6 4.9 5.2 V
Over-Voltage Threshold VOVP(th) 9.2 Ð 10.7 V
Output Leakage Current ICEX VCE = 850 V, VBE = -1.5 V Ð Ð 100 µA
Output Saturation Voltage VCE(sat) STR-S6707, IC = 2 A, IB = 400 mA Ð Ð 400 mV
STR-S6708, IC = 3 A, IB = 600 mA Ð Ð 400 mV
STR-S6709, IC = 4 A, IB = 800 mA Ð Ð 400 mV
VBE(sat) STR-S6707, IC = 2 A, IB = 400 mA Ð Ð 1.5 V
STR-S6708, IC = 3 A, IB = 600 mA Ð Ð 1.5 V
STR-S6709, IC = 4 A, IB = 800 mA Ð Ð 1.5 V
DC Current Gain hFE VCE = 4 V, IC = 1 A 29 Ð 61 Ð
Maximum ON Time ton 33 Ð 41 µs
Minimum OFF Time toff 45 Ð 55 µs
Over-Current Threshold VOCP(th) -0.9 -1.0 -1.1 V
Feedback Threshold Volt. VFDBK(th) Ð 650 Ð mV
Inhibit Threshold Voltage VINH(th) Oscillation stops 0.65 0.75 0.85 V
Oscillation synchronized Ð 1.4 2.0 V
Oscillation stops (fault latch set) 3.2 5.1 5.6 V
Latch Holding Current IINH VIN reduced from 10.7 V to 4 V Ð Ð 500 µA
Latch Reset Voltage VQIIN ≤ 100 µA, VIN reduced from 10.7 V 2.5 3.1 Ð V
Supply Current IIN(ON) Operating 15 Ð 29 mA
IIN(OFF) Ð Ð 200 µA
Insulation RMS Voltage VWM(RMS) All terminals simultaneous reference 2000 Ð Ð V
metal plate against backside
Thermal Shutdown TJ125 150 Ð °C
Thermal Resistance RθJM Output junction to mounting surface Ð 2.0 Ð °C/W
NOTES: Negative current is defined as coming out of (sourcing) the specified device terminal.
Typical Data is for design information only.
SINK
20 Ω
4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
™
STR-S6707 THRU STR-S6709
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
TYPICAL CHARACTERISTICS
100
10
1.0
COLLECTOR CURRENT in AMPERES
DC CURRENT GAIN
Dwg. GK-001
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-S6708
STR-S6707
STR-S6709
STR-S6707 THRU STR-S6709
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
TYPICAL QUASI-RESONANT FLYBACK CONVERTER
WARNING: lethal potentials are present. See text.
APPLICATIONS INFORMATION
WARNING Ñ 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. Precau-
tions 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 Ð 5.79 lbf¥ft (6 Ð 8 kg¥cm or 0.588 Ð 0.784 Nm).
Recommended metal-oxide-filled, alkyl-degenerated oil base, silicone grease:
Dow Corning 340, or equivalent
+
VOLTAGE
SENSE
FULL-BRIDGE
RECTIFIER
AC INPUT
100 V/120 V
+ OUTPUT
Ð OUTPUT
+
+
Dwg. EK-004A
R
SQ
+
+
+
+
98
5
4
3
1
2
7
6
+
+
★
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
™
STR-S6707 THRU STR-S6709
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
0.276
±0.016
Dwg. MK-003-9 in
0.953 ±0.008
0.610
±0.008
0.118 0.130
±0.008 ¿
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
Ð0.004
0.177
±0.028
PACKAGE
CENTER LEAD
CENTER
19
0.033
+0.008
Ð0.004
T REF.
M
Dimensions in Inches
(for reference only)
NOTE: Exact body and lead configuration at vendorÕs option within limits shown.
STR-S6707 THRU STR-S6709
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 ¿
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
Ð0.1
4.5
±0.7
PACKAGE
CENTER LEAD
CENTER
19
0.85
+0.2
Ð0.1
T REF
M
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 design of their products.
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.
NOTE: Exact body and lead configuration at vendorÕs option within limits shown.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
™
STR-S6707 THRU STR-S6709
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
POWER CONVERSION/POWER MANAGEMENT
SELECTION GUIDES
SWITCHING REGULATOR PMCMs
Part
Number* Application VIMax POPower 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.
