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STSR3 Datasheet(PDF) 1 Page - STMicroelectronics

Part # STSR3
Description  SYNCHRONOUS RECTIFIERS SMART DRIVER FOR FLYBACK
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STSR3 Datasheet(HTML) 1 Page - STMicroelectronics

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June 2003
s
SUPPLY VOLTAGE RANGE: 4V TO 5.5V
s
TYPICAL PEAK OUTPUT CURRENT:
(SOURCE 2A, SINK 3.5A)
s
OPERATING FREQUENCY: 30 TO 750 KHz
s
SMART TURN-OFF ANTICIPATION TIMING
s
AUTOMATIC TURN OFF FOR DUTY CYCLE
LESS THAN 14%
s
POSSIBILITY TO OPERATE IN
DISCONTINUOUS MODE
DESCRIPTION
STSR3 Smart Driver IC provides a high current
outputs
to
properly
drive
secondary
Power
Mosfets used as Synchronous Rectifier in low
output
voltage,
high
efficiency
Flyback
Converters. From a synchronizing clock input,
withdrawn on the secondary side of the isolation
transformer, the IC generates a driving signal with
set dead times with respect to the primary side
PWM signal.
The
IC
operation
prevents
secondary
side
shoot-through conditions at turn-on of the primary
switch providing anticipation in turn-off the output.
This smart function is implemented by a fast
cycle-after-cycle logic control mechanism, based
on a high frequency oscillator synchronized by the
clock signal. This anticipation is externally set
through external component. A special Inhibit
function allows to shut-off the drive output. This
feature makes discontinuous conduction mode
possible and avoids reverse conduction of the
synchronous rectifier.
STSR3
SYNCHRONOUS RECTIFIERS
SMART DRIVER FOR FLYBACK
PEAK
DETECTOR
BIAS
UVLO
CK
Vcc
6
5.7V
8
4
2
OUTPUT
BUFFER
1
N/C
PWRGND
SGLGND
ANTICIPATION
SET
3
5
INHIBIT
25mV
-
+
DIGITAL
CONTROL
HIGH
FREQUENCY
OSCILLATOR
7
+
+
+
OUTGATE
SETANT
SCHEMATIC DIAGRAM
SO-8


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