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STSR3 Datasheet

  • STSR3

  • SYNCHRONOUS RECTIFIERS SMART DRIVER FOR FLYBACK

  • 12頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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STSR3
SYNCHRONOUS RECTIFIERS
SMART DRIVER FOR FLYBACK
s
s
s
s
s
s
SUPPLY VOLTAGE RANGE: 4V TO 5.5V
TYPICAL PEAK OUTPUT CURRENT:
(SOURCE 2A, SINK 3.5A)
OPERATING FREQUENCY: 30 TO 750 KHz
SMART TURN-OFF ANTICIPATION TIMING
AUTOMATIC TURN OFF FOR DUTY CYCLE
LESS THAN 14%
POSSIBILITY TO OPERATE IN
DISCONTINUOUS MODE
SO-8
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withdrawn on the secondary side of the isolation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.
SCHEMATIC DIAGRAM
Vcc
2
+
BIAS
UVLO
5.7V
CK
4
PEAK
DETECTOR
ANTICIPATION
SET
3
SETANT
+
HIGH
FREQUENCY
OSCILLATOR
DIGITAL
CONTROL
OUTPUT
BUFFER
+
7
OUT
GATE
INHIBIT
5
-
+
25mV
1
N/C
6
8
SGLGND
PWRGND
June 2003
1/12

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