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STRS5707 Datasheet(PDF) 1 Page - Allegro MicroSystems

Part # STRS5707
Description  OFF-LINE SWITCHING REGULATORS - WITH BIPOLAR SWITCHING TRANSISTOR
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

STRS5707 Datasheet(HTML) 1 Page - Allegro MicroSystems

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The STR-S5707 and STR-S5708 are specifically designed to meet
the requirement for increased integration and reliability in off-line quasi-
resonant flyback converters with indirect feedback. Each 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.
FEATURES
I Quasi-Resonant Operation for Low EMI and High Efficiency
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:
Part
Output Current
Output Power, P
O
Number
Continuous, I
C
Peak, I
CM
Wide AC In
220/240 VAC In
STR-S5707
6 A
12 A
90 W
140 W
STR-S5708
7.5 A
15 A
120 W
180 W
OFF-LINE SWITCHING REGULATORS
– WITH BIPOLAR SWITCHING TRANSISTOR
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 ....................... 850 V
VEBO ................................................ 7 V
Continuous Output Current,
IC .......................................... See Table
1 ms Single-Pulse Output Current,
I
CM ........................................ See Table
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
STR-S5707 AND
STR-S5708


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