STSR30D STMicroelectronics

STSR30 SYNCHRONOUS RECTIFIER SMART DRIVER FOR FLYBACK SUPPLY VOLTAGE RANGE: 4V TO 5.5V TYPICAL PEAK OUTPUT CURRENT: (SOURCE-SINK: 1.5A) OPERATING FREQUENCY: 20 TO 500 KHz INHIBIT BLANKING TIME: 700 ns AUTOMATIC TURN OFF FOR DUTY-CYCLE LESS THAN 14% POSSIBILITY TO OPERATE IN SO-8 DISCONTINUOUS MODE switch providing anticipation in turn-off the output. DESCRIPTION This smart function is implemented by a fast STSR30 Smart Driver IC provides a high current cycle-after-cycle logic control mechanism, based outputs to properly drive secondary Power on a high frequency oscillator synchronized by the Mosfets used as Synchronous Rectifier in low clock signal. This anticipation is externally set output voltage, high efficiency Flyback through external component. A special Inhibit Converters. From a synchronizing clock input, function, detecting the voltage across the withdrawn on the secondary side of the isolation Synchronous FET, allows to shut-off the drive transformer, the IC generates a driving signal with output during discontinuous mode condition. A set dead times with respect to the primary side Disable pin allows turning off the device during PWM signal. no-load condition reducing overall current The IC operation prevents secondary side consumption. shoot-through conditions at turn-on of the primary BLOCK DIAGRAM January 2004 1/10STSR30 ABSOLUTE MAXIMUM RATINGS (Note 1) Symbol Parameter Value Unit V DC Input Voltage to SGLGND -0.3 to 6 V CC OUT Max Gate Drive Output Voltage -0.3 to V V GATE CC Max DISABLE Voltage -0.3 to V DISABLE V CC Max INHIBIT Voltage (*) -0.6 to V INHIBIT V CC CK Clock Input Voltage Range (*) -0.3 to V V CC ESD Human Body Model 2KV P Continuous Power Dissipation at T =105C SO-8 (No heatsink) 275 mW TOT A T Storage Temperature Range -40 to +150 C STG T Operating Junction Temperature Range -40 to +125 C OP 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 R Thermal Resistance Junction-case 40 C/W thj-case R Thermal Resistance Junction-ambient (*) 160 (*) C/W thj-amb (*) 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 SO-8 SO-8 (T&R) STSR30 STSR30D STSR30D-TR CONNECTION DIAGRAM (top view) 2/10