STR-S5703.PDF
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S5703
STR-S5707
QUASI-RESONANT FLYBACK
OFF-LINE SWITCHING REGULATOR
STR-S5703
OFF-LINE SWITCHING REGULATOR
– WITH BIPOLAR SWITCHING TRANSISTOR
COLLECTOR
1
The STR-S5703 is specifically designed to meet the requirement
for increased integration and reliability in off-line quasi-resonant flyback
converters with indirect feedback. The device incorporates 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
OVER-CURRENT
PROTECTION
5
INHIBIT
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
primary-side error amplifier with reference is included to facilitate
regulation from an auxiliary or bias winding of the power transformer. 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.
32 V SENSE
7
REF.
DRIVE
8
UVLO
V
IN
9
Dwg. PK-004
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
IN
...........................
15 V
Output Voltage, V
CEX
.......................
500 V
V
EBO
................................................
7 V
Continuous Output Current,
I
C
..................................................
6.0 A
1 ms Single
-
Pulse Output Current,
I
CM
.................................................
12 A
Sink Current, I
S
.................................
1.5 A
Drive Current, I
D
..........................
-700 mA
Inhibit Voltage, V
INH
...........................
15 V
Over-Current Protection Voltage Range,
V
OCP
............................................
Proven in substantial volumes, this device and its fixed-frequency
counterparts represents a significant advance in off-line SMPS reliability
growth and integration. Similar devices with increased ratings are the
STR-S5707 and STR-S5708.
FEATURES
n
Quasi-Resonant Operation for Low EMI and High Efficiency
n
Output Power to 140 W
n
Low-Power Output Standby Mode
3.5 V
Insulation Voltage, V
WM(RMS)
..........
2000 V
Package Power Diss., P
D
........
See Graph
Output Junction Temperature, T
J
..
+150
±
n
Indirect Feedback from Auxiliary Winding
Reduces External Component Count
n
Pulse-by-Pulse Over-Current Protection
n
Latched Over-Voltage and Thermal Protection
°
C
n
Third-Generation Switching Transistor with Proportional Drive
Internal Frame Temperature, T
F
...
+125
°
C
n
Maximum ON Time and Off Time Set During Manufacture
Operating Temperature Range,
T
A
...............................
-20
n
Internal Under-Voltage Lockout with Hysteresis
°
C to +125
°
C
n
Over-Molded SIP with Integral Isolated Heat Spreader
Storage Temperature Range,
T
stg
.............................
-40
°
C to +125
°
C
Always order by complete part number:
STR-S5703 .
A
TM
MicroSystems, Inc.
STR-S5703
QUASI-RESONANT FLYBACK
OFF-LINE SWITCHING REGULATOR
TM
STR-S5703
QUASI-RESONANT FLYBACK
OFF-LINE SWITCHING REGULATOR
FUNCTIONAL BLOCK DIAGRAM
V
IN
INHIBIT
9
6
UVLO
R
SENSE 7
OVER-VOLT
.
PROTECT
FAULT
LATCH
PROPORTIONAL
DRIVE
S
Q
1 k
W
8
DRIVE
REF
.
4
SINK
TSD
OSC
.
3
BASE
R
ton
1500 pF
+
1
COLLECTOR
0.75 V
+
2
COMMON
3300 pF
R
toff
1.4 V
-1 V
+
5
OVER-CURRENT
PROTECTION
+
5.1 V
Dwg. FK-001-1
ALLOWABLE PACKAGE POWER DISSIPATION
MAXIMUM SAFE OPERATING AREA
30
60
MOUNTING SURFACE
TEMPERATURE
54 W
10
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-003-2
Dwg. GK-002-2A
A
TM
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1994 Allegro MicroSystems, Inc.
MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
TM
STR-S5707
QUASI-RESONANT FLYBACK
OFF-LINE SWITCHING REGULATOR
C, V
IN
= 8.5 V, voltage measurements are
referenced 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)
I
C
= 2 A, I
B
= 400 mA
–
–
400
mV
V
BE(sat)
I
C
= 2 A, I
B
= 400 mA
–
–
1.5
V
DC Current Gain
h
FE
V
CE
= 4 V, I
C
= 1 A
23
–
46
–
Maximum ON Time
t
on
33
–
41
m
s
Minimum OFF Time
t
off
45
–
55
m
s
Over-Current Threshold
V
OCP(th)
-0.88 -1.0 -1.12
V
Sense Voltage
V
SENSE
I
SENSE
= 3.2 mA
31.7 32.0 32.3
V
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 5.8
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
Ref. Voltage Temp. Coeff.
a
VZ
-20
°
C
£
T
F
£
+100
°
C, I
IN
= 3.2 mA
–
2.5
– mV/
°
C
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.
STR-S5703
QUASI-RESONANT FLYBACK
OFF-LINE SWITCHING REGULATOR
ELECTRICAL CHARACTERISTICS at T
A
= +25
STR-S5703
QUASI-RESONANT FLYBACK
OFF-LINE SWITCHING REGULATOR
TYPICAL CHARACTERISTICS
100
50
30
V = 4 V
CE
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-001-1
A
TM
MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
TM
STR-S5707
QUASI-RESONANT FLYBACK
OFF-LINE SWITCHING REGULATOR
TYPICAL QUASI-RESONANT FLYBACK CONVERTER
WARNING:
lethal potentials are present. See below.
+ OUTPUT
7
9
6
R
+
S
Q
8
+
4
3
– OUTPUT
+
1
+
2
+
5
+
H
Dwg. EK-005A
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.
Precautions 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
STR-S5703
QUASI-RESONANT FLYBACK
OFF-LINE SWITCHING REGULATOR
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