STSR3 SMART DRIVER Datasheet

STSR3 Datasheet, PDF, Equivalent


Part Number

STSR3

Description

SYNCHRONOUS RECTIFIERS SMART DRIVER

Manufacture

STMicroelectronics

Total Page 12 Pages
Datasheet
Download STSR3 Datasheet


STSR3
STSR3
SYNCHRONOUS RECTIFIERS
SMART DRIVER FOR FLYBACK
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
www.DataSheet4U.com
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withdrawn on the secondary side of the isolation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
SO-8
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
June 2003
CK 4
PEAK
DETECTOR
+
HIGH
FREQUENCY
OSCILLATOR
INHIBIT 5
-
+
25mV
Vcc
2
BIAS
UVLO
+
5.7V
ANTICIPATION
SET
3 SETANT
DIGITAL
CONTROL
OUTPUT +
BUFFER
7 OUTGATE
6
SGLGND
8
PWRGND
1 N/C
1/12

STSR3
STSR3
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
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
STSR3
SO-8
STSR3CD
SO-8 (T&R)
STSR3CD-TR
CONNECTION DIAGRAM (top view)
2/12


Features STSR3 SYNCHRONOUS RECTIFIERS SMART DRIVE R FOR FLYBACK s s s s s s SUPPLY VOL TAGE RANGE: 4V TO 5.5V TYPICAL PEAK OUT PUT CURRENT: (SOURCE 2A, SINK 3.5A) OPE RATING FREQUENCY: 30 TO 750 KHz SMART T URN-OFF ANTICIPATION TIMING AUTOMATIC T URN OFF FOR DUTY CYCLE LESS THAN 14% PO SSIBILITY TO OPERATE IN DISCONTINUOUS M ODE SO-8 www.DataSheet4U.com DESCRIP TION STSR3 Smart Driver IC provides a h igh current outputs to properly drive s econdary Power Mosfets used as Synchron ous Rectifier in low output voltage, hi gh 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 respec t to the primary side PWM signal. The I C operation prevents secondary side sho ot-through conditions at turn-on of the primary switch providing anticipation in turn-off the output. This smart fun ction is implemented by a fast cycle-af ter-cycle logic control mechanism, based on a high frequency os.
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