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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-
generation high-voltage bipolar switching transistor.
1
COLLECTOR
2
COMMON
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
DRIVE
FAULT
LATCH
SINK
4
OSC.
R
DRIVE
5
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.
OVER-CURRENT
PROTECTION
6
REF.
FDBK
7
INHIBIT
8
UVLO
V
IN
9
Dwg. PK-001
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
IN
...........................
15 V
Output Voltage, V
CEX
.......................
850 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
.........................
See Table
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.
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
±
3.5 V
Insulation Voltage,V
WM(RMS)
...........
2000 V
Package Power Diss., P
D
........
See Graph
Output Junction Temperature, T
J
..
+150
Internal Under-Voltage Lockout with Hysteresis
Over-Molded SIP with Integral Isolated Heat Spreader
°
C
Always order by complete part number:
Max. Cont.
°
Internal Frame Temperature, T
F
...
+125
C
Peak
Max. Sink
Part Number
Current, I
C
Current, I
CM
Current, I
S
Operating Temperature Range,
T
A
...............................
-20
°
°
C to +125
C
STR-S6707
6 A
12 A
1.5 A
Storage Temperature Range,
T
stg
.............................
-40
STR-S6708
7.5 A
15 A
1.5 A
°
°
C to +125
C
STR-S6709
10 A
20 A
2 A
™
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
DRIVE
S
Q
5
1 k
Ω
REF.
SINK
4
0.7
Ω
TSD
OSC.
3
BASE
R
ton
1
COLLECTOR
+
0.75 V
+
2
COMMON
FDBK
7
1.4 V
3300 pF
R
toff
-1 V
+
OVER-CURRENT
PROTECTION
6
+
5.1 V
Dwg. FK-001
ALLOWABLE PACKAGE POWER DISSIPATION
MAXIMUM SAFE OPERATING AREA
30
STR-S6709 (20 A)
STR-S6708 (15 A)
STR-S6707 (12 A)
60
MOUNTING SURFACE
TEMPERATURE
54 W
10
RECOMMENDED MAX.
FRAME TEMP. = +100
°
C
40
5.0
3.0
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
LIMITED BY FRAME
TEMP. = +125
°
C MAX.
µ
s
dc < 1%
20
1.0
FREE AIR
0.5
3.2 W
0
0.3
0
200
400
600
800
1000
20
60
100
140
TEMPERATURE in
°
C
COLLECTOR-EMITTER VOLTAGE in VOLTS
Dwg. GK-003-2
Dwg. GK-002
™
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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
SINK
4
20
Ω
°
ELECTRICAL CHARACTERISTICS at T
A
= +25
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
= 850 V, V
BE
= -1.5 V
–
–
100
µ
A
Output Saturation Voltage
V
CE(sat)
STR-S6707, I
C
= 2 A, I
B
= 400 mA
–
–
400
mV
STR-S6708, I
C
= 3 A, I
B
= 600 mA
–
–
400
mV
STR-S6709, I
C
= 4 A, I
B
= 800 mA
–
–
400
mV
V
BE(sat)
STR-S6707, I
C
= 2 A, I
B
= 400 mA
–
–
1.5
V
STR-S6708, I
C
= 3 A, I
B
= 600 mA
–
–
1.5
V
STR-S6709, I
C
= 4 A, I
B
= 800 mA
–
–
1.5
V
DC Current Gain
h
FE
V
CE
= 4 V, I
C
= 1 A
29
–
61
–
Maximum ON Time
t
on
33
–
41
µ
s
Minimum OFF Time
t
off
45
–
55
µ
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
µ
A
Latch Reset Voltage
V
Q
I
IN
≤
100
µ
A, V
IN
reduced from 10.7 V
2.5
3.1
–
V
Supply Current
I
IN(ON)
Operating
15
–
29
mA
I
IN(OFF)
–
–
200
µ
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
Output junction to mounting surface
–
2.0
–
°
C/W
θ
JM
NOTES: Negative current is defined as coming out of (sourcing) the specified device terminal.
Typical Data is for design information only.
www.allegromicro.com
STR-S6707
THRU
STR-S6709
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATORS
TYPICAL CHARACTERISTICS
100
50
30
V = 4 V
CE
10
STR-S6709
STR-S6708
STR-S6707
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
™
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 QUASI-RESONANT FLYBACK CONVERTER
WARNING:
lethal potentials are present. See text.
+ OUTPUT
9
8
R
+
+
S
Q
5
VOLTAGE
SENSE
4
3
– 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.
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
www.allegromicro.com
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