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STSR2PM Datasheet(PDF) 1 Page - STMicroelectronics

Part # STSR2PM
Description  FORWARD SYNCHRONOUS RECTIFIERS SMART DRIVER
Download  12 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STSR2PM Datasheet(HTML) 1 Page - STMicroelectronics

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September 2003
s
SUPPLY VOLTAGE RANGE: 4.5V TO 5.5V
s
TYPICAL PEAK OUTPUT CURRENT:
SOURCE -2A, SINK 3.5A
s
OPERATING FREQUENCY: 20 TO 750 KHZ
s
SMART TURN-OFF ANTICIPATION TIMING
s
OPERATION INDEPENDENT FROM THE
FORWARD MAGNETIC RESET TECHNIQUE
s
POSSIBILITY TO OPERATE IN
DISCONTINUOUS MODE
DESCRIPTION
STSR2P
Smart
Driver
IC
provides
two
complementary high current outputs to drive
Power Mosfets. The IC is dedicated to properly
drive
secondary
Synchronous
Rectifiers
in
medium power, low output voltage, high efficiency
Forward Converters. From a synchronizing clock
input, STSR2P generates two driving signals with
the
self-setting
of
dead
time
between
complementary pulses. The IC operation prevents
secondary
side
shoot-through
conditions
providing proper timing at the outputs turn-off
transition. This smart function operates through a
fast cycle-after-cycle control logic mechanism
based on an internal high frequency oscillator,
synchronized
by
the
clock
signal.
A
fixed
anticipation in turning-off the OUTGATE1 with
respect to the clock signal transition is provided,
while the anticipation in turning off the OUTGATE2
can be set through external components. The
adopted transitions revelation mechanism makes
circuit operation independent by the forward
magnetic reset technique used, avoiding most of
the common problems inherent in self-driven
synchronous rectifiers. A special Inhibit function
allows the shut-off of OUTGATE2. This feature
makes discontinuous conduction mode possible
and prevents the freewheeling mosfet from
sinking current from the output.
STSR2P automatically turns off the outputs when
duty-cycle is lower than 13%, while STSR2PM
works even at very low duty-cycle values.
STSR2P/
STSR2PM
FORWARD SYNCHRONOUS
RECTIFIERS SMART DRIVER
PEAK
DETECTOR
BIAS
UVLO
CK
Vcc
6
5.7V
8
4
2
OUTPUT
BUFFERS
7
OUTGate2
PWRGND
SGLGND
ANTICIPATION
SET
3 SETANT2
5
INHIBIT
25mV
-
+
DIGITAL
CONTROL
HIGH
FREQUENCY
OSCILLATOR
1
OUTGate1
+
+
+
SCHEMATIC DIAGRAM
SO-8


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