STSR30 SMART DRIVER Datasheet

STSR30 Datasheet, PDF, Equivalent


Part Number

STSR30

Description

SYNCHRONOUS RECTIFIER SMART DRIVER

Manufacture

STMicroelectronics

Total Page 10 Pages
Datasheet
Download STSR30 Datasheet


STSR30
STSR30
SYNCHRONOUS RECTIFIER
SMART DRIVER FOR FLYBACK
s SUPPLY VOLTAGE RANGE: 4V TO 5.5V
s TYPICAL PEAK OUTPUT CURRENT:
(SOURCE-SINK: 1.5A)
s OPERATING FREQUENCY: 20 TO 500 KHz
s INHIBIT BLANKING TIME: 700 ns
s AUTOMATIC TURN OFF FOR DUTY-CYCLE
LESS THAN 14%
s POSSIBILITY TO OPERATE IN
DISCONTINUOUS MODE
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DESCRIPTION
STSR30 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withdrawn on the secondary side of the isolation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
BLOCK DIAGRAM
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, detecting the voltage across the
Synchronous FET, allows to shut-off the drive
output during discontinuous mode condition. A
Disable pin allows turning off the device during
no-load condition reducing overall current
consumption.
January 2004
1/10

STSR30
STSR30
ABSOLUTE MAXIMUM RATINGS (Note 1)
Symbol
Parameter
Value
Unit
VCC DC Input Voltage to SGLGND
-0.3 to 6
V
OUTGATE Max Gate Drive Output Voltage
-0.3 to VCC
V
DISABLE Max DISABLE Voltage
-0.3 to VCC
V
INHIBIT Max INHIBIT Voltage (*)
-0.6 to VCC
V
CK Clock Input Voltage Range (*)
-0.3 to VCC
V
ESD Human Body Model
±2 KV
PTOT Continuous Power Dissipation at TA=105°C SO-8 (No heatsink) 275 mW
TSTG Storage Temperature Range
-40 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-case 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
STSR30
SO-8
STSR30D
SO-8 (T&R)
STSR30D-TR
CONNECTION DIAGRAM (top view)
2/10


Features STSR30 SYNCHRONOUS RECTIFIER 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-SINK: 1.5A) OPERAT ING FREQUENCY: 20 TO 500 KHz INHIBIT BL ANKING TIME: 700 ns AUTOMATIC TURN OFF FOR DUTY-CYCLE LESS THAN 14% POSSIBILIT Y TO OPERATE IN DISCONTINUOUS MODE SO- 8 www.DataSheet4U.com DESCRIPTION STS R30 Smart Driver IC provides a high cur rent outputs to properly drive secondar y Power Mosfets used as Synchronous Rec tifier in low output voltage, high effi ciency Flyback Converters. From a synch ronizing clock input, withdrawn on the secondary side of the isolation transfo rmer, the IC generates a driving signal with set dead times with respect to th e primary side PWM signal. The IC opera tion prevents secondary side shoot-thro ugh conditions at turn-on of the primar y BLOCK DIAGRAM switch providing antic ipation in turn-off the output. This sm art function is implemented by a fast c ycle-after-cycle logic control mechanism, based on a high frequ.
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