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STR-S5703 Datasheet(PDF) 1 Page - Allegro MicroSystems

Part No. STR-S5703
Description  OFF-LINE SWITCHING REGULATOR WITH BIPOLAR SWITCHING TRANSISTOR
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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STR-S5703 Datasheet(HTML) 1 Page - Allegro MicroSystems

   
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OFF-LINE SWITCHING REGULATOR
– WITH BIPOLAR SWITCHING TRANSISTOR
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.
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
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.
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
I Quasi-Resonant Operation for Low EMI and High Efficiency
I Output Power to 140 W
I Low-Power Output Standby Mode
I Indirect Feedback from Auxiliary Winding
Reduces External Component Count
I Pulse-by-Pulse Over-Current Protection
I Latched Over-Voltage and Thermal Protection
I Third-Generation Switching Transistor with Proportional Drive
I Maximum ON Time and Off Time Set During Manufacture
I Internal Under-Voltage Lockout with Hysteresis
I Over-Molded SIP with Integral Isolated Heat Spreader
Always order by complete part number: STR-S5703 .
STR-S5703
OVER-CURRENT
PROTECTION
BASE
COLLECTOR
UVLO
COMMON
V IN
Dwg. PK-004
INHIBIT
FAULT
LATCH
REF.
1
2
3
4
5
6
7
OSC.
R
S
FAULT
8
9
SINK
DRIVE
+
DRIVE
32 V SENSE
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
IN ...........................
15 V
Output Voltage, VCEX ....................... 500 V
VEBO ................................................ 7 V
Continuous Output Current,
IC .................................................. 6.0 A
1 ms Single-Pulse Output Current,
I
CM ................................................. 12 A
Sink Current, IS ................................. 1.5 A
Drive Current, ID .......................... -700 mA
Inhibit Voltage, V
INH ...........................
15 V
Over-Current Protection Voltage Range,
VOCP ............................................
±3.5 V
Insulation Voltage, VWM(RMS) .......... 2000 V
Package Power Diss., P
D ........ See Graph
Output Junction Temperature, TJ .. +150
°C
Internal Frame Temperature, TF ... +125
°C
Operating Temperature Range,
T
A ............................... -20
°C to +125°C
Storage Temperature Range,
Tstg ............................. -40
°C to +125°C


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