STR-S6703 STR-S6704.PDF

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S6703
STR-S6703 AND STR-S6704
QUASI-RESONANT FLYBACK
OFF-LINE SWITCHING REGULATORS
STR-S6703 AND
STR-S6704
OFF-LINE SWITCHING REGULATORS
– WITH BIPOLAR SWITCHING TRANSISTOR
COLLECTOR
1
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.
COMMON
2
FAULT
BASE
3
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
SINK
4
DRIVE
OSC.
FAULT
LATCH
R
DRIVE
5
OVER-CURRENT
PROTECTION
6
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.
FDBK
7
REF.
INHIBIT
8
UVLO
V IN
9
Dwg. PK-001
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V IN ........................... 15 V
Output Voltage, V CEX ....................... 500 V
V EBO ................................................ 7 V
Continuous Output Current,
I C .......................................... See Table
1 ms Single - Pulse Output Current,
I CM ........................................ See Table
Sink Current, I S ................................. 1.5 A
Drive Current, I D .......................... -700 mA
Feedback Current, I FDBK ................. 20 mA
Inhibit Voltage, V INH ........................... 15 V
Over-Current Protection Voltage Range,
V OCP ............................................
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
n
Quasi-Resonant Operation for Low EMI and High Efficiency
n
Output Power to 140 W
n
Low-Power Output Standby Mode
n
Pulse-by-Pulse Over-Current Protection
n
Latched Over-Voltage and Thermal Protection
3.5 V
Insulation Voltage,V WM(RMS) ........... 2000 V
Package Power Diss., P D ........ See Graph
Output Junction Temperature, T J .. +150
±
n
Third-Generation Switching Transistor with Proportional Drive
n
Maximum ON Time and OFF Time Set During Manufacture
n
Internal Under-Voltage Lockout with Hysteresis
°
C
n
Over-Molded SIP with Integral Isolated Heat Spreader
Internal Frame Temperature, T F ... +125
°
C
Always order by complete part number:
Max. Cont.
Operating Temperature Range,
T A ............................... -20
Peak
°
C to +125
°
C
Part Number
Current, I C
Current, I CM
Storage Temperature Range,
T stg ............................. -40
°
°
STR-S6703
6 A
12 A
C to +125
C
STR-S6704
5 A
10 A
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STR-S6703 AND STR-S6704
QUASI-RESONANT FLYBACK
OFF-LINE SWITCHING REGULATORS
FUNCTIONAL BLOCK DIAGRAM
V IN
INHIBIT
9
8
UVLO
R
OVER-VOLT.
PROTECT
FAULT
LATCH
PROPORTIONAL
DRIVE
S
Q
1 k W
5
DRIVE
REF.
4
SINK
TSD
0.7
W
OSC.
3
BASE
R ton
+
1
COLLECTOR
0.75 V
FDBK
7
+
2
COMMON
1.4 V
3300 pF
R toff
-1 V
+
6
OVER-CURRENT
PROTECTION
+
5.1 V
Dwg. FK-001
ALLOWABLE PACKAGE POWER DISSIPATION
MAXIMUM SAFE OPERATING AREA
30
60
MOUNTING SURFACE
TEMPERATURE
STR-S6703 (54 W)
STR-S6704 (50 W)
STR-S6703 (12 A)
10
STR-S6704 (10 A)
40
RECOMMENDED MAX.
FRAME TEMP. = +100 ° C
5.0
3.0
LIMITED BY FRAME
TEMP. = +125
C MAX.
L = 6 mH
I B1 = 2.5 A
I B2 = 0.8 A
t on = 100 m 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
°
W
Copyright © 1994 Allegro MicroSystems, Inc.
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STR-S6703 AND STR-S6704
QUASI-RESONANT FLYBACK
OFF-LINE SWITCHING REGULATORS
C, V IN = 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
V INT
Turn-on, increasing V IN
7.6 8.0 8.4
V
Under-Voltage Lockout
V INQ
Turn-off, decreasing V IN
4.6 4.9 5.2
V
Over-Voltage Threshold
V OVP(th)
9.2
–
10.7
V
Output Leakage Current
I CEX
V CE = 500 V, V BE = -1.5 V
–
–
100
m
A
Output Saturation Voltage
V CE(sat)
STR-S6703, I C = 2 A, I B = 400 mA
–
–
400
mV
STR-S6704, I C = 2 A, I B = 400 mA
–
–
TBD
mV
V BE(sat)
STR-S6703, I C = 2 A, I B = 400 mA
–
–
1.5
V
STR-S6704, I C = 2 A, I B = 400 mA
–
–
TBD
V
DC Current Gain
h FE
STR-S6703, V CE = 4 V, I C = 1 A
23
–
46
–
STR-S6704, V CE = 4 V, I C = 1 A
20
–
50
–
Maximum ON Time
t on
33
–
41
m
s
Minimum OFF Time
t off
45
–
55
m
s
Over-Current Threshold
V OCP(th)
-0.9 -1.0 -1.1
V
Feedback Threshold Volt.
V FDBK(th)
–
650
–
mV
Inhibit Threshold Voltage
V INH(th)
Oscillation stops
0.65 0.75 0.85
V
Oscillation synchronized
–
1.4 2.0
V
Oscillation stops (fault latch set)
3.2 5.1 5.6
V
Latch Holding Current
I INH
V IN reduced from 10.7 V to 4 V
–
–
500
m
A
Latch Reset Voltage
V Q
I IN
£
100
m
A, V IN reduced from 10.7 V
2.5 3.1
–
V
Supply Current
I IN(ON)
Operating
15
–
28
mA
I IN(OFF)
–
–
200
m
A
Insulation RMS Voltage
V WM(RMS)
All terminals simultaneous reference
2000 –
–
V
metal plate against backside
Thermal Shutdown
T J
125 150
–
°
C
Thermal Resistance
R
q JM
Output junction to mounting surface
–
2.0
–
°
C/W
NOTES: Negative current is defined as coming out of (sourcing) the specified device terminal.
Typical Data is for design information only.
ELECTRICAL CHARACTERISTICS at T A = +25
311053822.025.png
STR-S6703 AND STR-S6704
QUASI-RESONANT FLYBACK
OFF-LINE SWITCHING REGULATORS
TYPICAL CHARACTERISTICS
100
50
30
V = 4 V
CE
STR-S6703
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
311053822.026.png 311053822.027.png 311053822.028.png
 
STR-S6703 AND STR-S6704
QUASI-RESONANT FLYBACK
OFF-LINE SWITCHING REGULATORS
TYPICAL QUASI-RESONANT FLYBACK CONVERTER
WARNING: lethal potentials are present. See text.
+ OUTPUT
9
8
R
+
+
S
Q
5
VOLTAGE
SENSE
4
3
– OUTPUT
+
1
7
+
2
+
6
+
H
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.
Recommended mounting hardware torque:
4.34 – 5.79 lbf•ft (6 – 8 kg•cm or 0.588 – 0.784 Nm).
Recommended metal-oxide-filled, alkyl-degenerated oil base, silicone grease:
Dow Corning 340, or equivalent
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