STSR2PM SMART DRIVER Datasheet

STSR2PM Datasheet, PDF, Equivalent


Part Number

STSR2PM

Description

FORWARD SYNCHRONOUS RECTIFIERS SMART DRIVER

Manufacture

STMicroelectronics

Total Page 12 Pages
Datasheet
Download STSR2PM Datasheet


STSR2PM
STSR2P/
STSR2PM
FORWARD SYNCHRONOUS
RECTIFIERS SMART DRIVER
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
www.DataSheet4U.com
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
SO-8
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.
SCHEMATIC DIAGRAM
September 2003
CK 4
PEAK
DETECTOR
+
HIGH
FREQUENCY
OSCILLATOR
INHIBIT 5
-
+
25mV
Vcc
2
BIAS
UVLO
+
5.7V
ANTICIPATION
SET
+
DIGITAL OUTPUT
CONTROL BUFFERS
3 SETANT2
1 OUTGate1
7 OUTGate2
6
SGLGND
8
PWRGND
1/12

STSR2PM
STSR2P/STSR2PM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VCC DC Input Voltage
-0.3 to 6
V
VOUTGATE Max Gate Drive Output Voltage
-0.3 to VCC
V
VINHIBIT Max INHIBIT Voltage (*)
-0.6 to VCC
V
VCK Clock Input Voltage Range (*)
-0.3 to VCC
V
ILX Switching Peak Current
2A
PTOT Continuous Power Dissipation at TA=105°C without heatsink
270 mW
ESD Human Body Model
Pins 1,2, 4, 5, 6, 7, 8
±1
KV
Pin 3
±0.9
KV
Tstg Storage Temperature Range
-55 to +150
°C
Top Operating Junction Temperature Range
-40 to +125
°C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
(*) A higher positive voltage level can be applied to the pin with a resistor which limits the current flowing into the pin to 10mA maximum
THERMAL DATA
Symbol
Parameter
SO-8
Unit
Rthj-amb Thermal Resistance Junction-case
40 °C/W
Rthj-amb Thermal Resistance Junction-ambient (*)
160 °C/W
(*) This value is referred to one layer pcb board with minimum copper connections for the leads. a minimum value of 120 °C/W can be
obtained improving thermal conductivity of the board
ORDERING CODES
TYPE
STSR2P
STSR2PM
SO-8
STSR2PCD
STSR2PMCD
SO-8 (T&R)
STSR2PCD-TR
STSR2PMCD-TR
CONNECTION DIAGRAM (top view)
2/12


Features STSR2P/ STSR2PM FORWARD SYNCHRONOUS RECT IFIERS SMART DRIVER s s s s s s SUPP LY VOLTAGE RANGE: 4.5V TO 5.5V TYPICAL PEAK OUTPUT CURRENT: SOURCE -2A, SINK 3 .5A OPERATING FREQUENCY: 20 TO 750 KHZ SMART TURN-OFF ANTICIPATION TIMING OPER ATION INDEPENDENT FROM THE FORWARD MAGN ETIC RESET TECHNIQUE POSSIBILITY TO OPE RATE IN DISCONTINUOUS MODE SO-8 www.D ataSheet4U.com DESCRIPTION STSR2P Smar t Driver IC provides two complementary high current outputs to drive Power Mos fets. The IC is dedicated to properly d rive secondary Synchronous Rectifiers i n medium power, low output voltage, hig h efficiency Forward Converters. From a synchronizing clock input, STSR2P gene rates two driving signals with the self -setting of dead time between complemen tary pulses. The IC operation prevents secondary side shoot-through conditions providing proper timing at the outputs turn-off transition. This smart functi on operates through a fast cycle-after- cycle control logic mechanism based on an internal high frequen.
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