STR-S6703 STR-S6704: Off-Line Switching Regulators - With Bipolar Switching Transistor
STR-S6703 STR-S6704: Off-Line Switching Regulators - With Bipolar Switching Transistor
STR-S6703 STR-S6704: Off-Line Switching Regulators - With Bipolar Switching Transistor
Data Sheet
28113.1*
STR-S6704
OFF-LINE SWITCHING REGULATORS
WITH BIPOLAR SWITCHING TRANSISTOR
The STR-S6703 and STR-S6704 are specifically designed to meet
the requirement for increased integration and reliability in off-line quasi-
COLLECTOR 1 resonant flyback converters. These devices incorporate the primary
2
control and proportional drive circuit with a third-generation high-voltage
COMMON
FAULT bipolar switching transistor.
BASE 3
S Crucial system parameters such as maximum ON time and OFF
DRIVE FAULT
SINK 4 OSC. LATCH time are fixed during manufacture. Local control circuit decoupling and
R
DRIVE 5
layout are optimized within each device.
OVER-CURRENT
6
Cycle-by-cycle current limiting, under-voltage lock-out with hyster-
PROTECTION
+
REF.
esis, over-voltage protection, and thermal shutdown protect these
FDBK 7
devices during all normal and overload conditions. Over-voltage
INHIBIT 8
+ protection and thermal shutdown are latched after a short delay. A
UVLO
versatile triple-level inhibit circuit includes the OFF time synchronization
V IN 9
required to establish quasi-resonant operation. The inhibit function has
also been expanded to initiate operation in stand-by mode in which the
Dwg. PK-001 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-
ABSOLUTE MAXIMUM RATINGS molded single-in-line power package.
Supply Voltage, VIN ........................... 15 V Proven in substantial volumes, these devices and their fixed-
Output Voltage, VCEX ....................... 500 V frequency counterparts represent a significant advance in off-line SMPS
VEBO ................................................ 7 V reliability growth and integration. Similar devices, with an output
Continuous Output Current, voltage rating of 850 V and output power ratings to 220 W, are available
IC .......................................... See Table as the STR-S6707 thru STR-S6709.
1 ms Single-Pulse Output Current, FEATURES
ICM ........................................ See Table
Quasi-Resonant Operation for Low EMI and High Efficiency
Sink Current, IS ................................. 1.5 A
Output Power to 140 W
Drive Current, ID .......................... -700 mA
Low-Power Output Standby Mode
Feedback Current, IFDBK ................. 20 mA
Pulse-by-Pulse Over-Current Protection
Inhibit Voltage, VINH ........................... 15 V
Latched Over-Voltage and Thermal Protection
Over-Current Protection Voltage Range,
VOCP ............................................ 3.5 V Third-Generation Switching Transistor with Proportional Drive
Insulation Voltage,VWM(RMS) ........... 2000 V Maximum ON Time and OFF Time Set During Manufacture
Package Power Diss., PD ........ See Graph Internal Under-Voltage Lockout with Hysteresis
Output Junction Temperature, TJ .. +150C Over-Molded SIP with Integral Isolated Heat Spreader
Internal Frame Temperature, TF ... +125C Always order by complete part number:
Operating Temperature Range, Max. Cont. Peak
TA ............................... -20C to +125C Part Number Current, IC Current, ICM
Storage Temperature Range, STR-S6703 6A 12 A
Tstg ............................. -40C to +125C STR-S6704 5A 10 A
STR-S6703 AND STR-S6704
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
9 8
R
UVLO
OVER-VOLT. FAULT PROPORTIONAL
PROTECT LATCH DRIVE
S Q 5 DRIVE
1 k
REF.
4 SINK
TSD 0.7
OSC.
3 BASE
Rton
+ 1 COLLECTOR
0.75 V
+ 2 COMMON
FDBK 7
3300 pF Rtoff 1.4 V
-1 V
+
OVER-CURRENT
6
PROTECTION
+
5.1 V
Dwg. FK-001
30
60
MOUNTING SURFACE
ALLOWABLE PACKAGE POWER DISSIPATION in WATTS
RECOMMENDED MAX.
40 FRAME TEMP. = +100C 5.0
3.0
L = 6 mH
IB1 = 2.5 A
LIMITED BY FRAME IB2 = 0.8 A
TEMP. = +125C MAX. ton = 100 s
dc < 1%
20
1.0
FREE AIR
0.5
3.2 W
0 0.3
20 60 100 140 0 100 200 300 400 500 600 700
TEMPERATURE in C COLLECTOR-EMITTER VOLTAGE in VOLTS
Dwg. GK-003-3 Dwg. GK-002-3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright 1994 Allegro MicroSystems, Inc.
STR-S6703 AND STR-S6704
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
www.allegromicro.com
STR-S6703 AND STR-S6704
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
TYPICAL CHARACTERISTICS
100
50
30
DC CURRENT GAIN
STR-S6703
VCE= 4 V
10
5.0
3.0
1.0
0.01 0.03 0.1 0.3 1.0 3.0 10 30 100
COLLECTOR CURRENT in AMPERES
Dwg. GK-001-3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
STR-S6703 AND STR-S6704
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
+ + OUTPUT
9 8 +
R
FULL-BRIDGE
100 V/120 V
+
AC INPUT
RECTIFIER
S Q 5
VOLTAGE
SENSE
4 +
OUTPUT
+ 1
+ 2
7
+
6
Dwg. EK-004A
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. 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.
www.allegromicro.com
STR-S6703 AND STR-S6704
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
Dimensions in Inches
(for reference only)
0.953 0.008
T M REF.
0.610
0.008 0.130 0.216
0.118 0.008 0.008
1.49 0.012
0.709 0.008
0.130
0.004
0.276
0.016
0.216
1 9
0.016 0.100
0.033 0.026
0.004
+0.008 +0.008
0.004 0.004
0.177
0.028
PACKAGE LEAD
CENTER CENTER
Dwg. MK-003-9 in
NOTE: Exact body and lead configuration at vendors option within limits shown.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
STR-S6703 AND STR-S6704
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
Dimensions in Millimeters
(controlling dimensions)
24.2 0.2
T M REF
15.5 0.2
3.3 5.5
3.0 0.2 0.2
23.0 0.3
18.0 0.2
3.3
0.1
7.0
0.4
5.5
1 9
0.4 2.54
0.85 0.65
+0.2 0.1
+0.2
0.1 0.1
4.5
0.7
PACKAGE LEAD
CENTER CENTER
Dwg. MK-003-9 mm
NOTE: Exact body and lead configuration at vendors option within limits shown.
www.allegromicro.com
STR-S6703 AND STR-S6704
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
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 performance, reliability, or
manufacturability of their products. Therefore, the user is cautioned to verify that the information in this publication is
current before placing any order.
These products are not authorized for use as critical components in life-support appliances, devices, or systems
without express written approval.
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.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000