STSR30D

The STSR30D is a Smart Driver IC provides a high current outputs to properly drive secondary power MOSFETS used as synchronous rectifier in low output voltage and 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 From a synchronizing clock input, withdrawn on the secondary side of the isolation transformer, the IC generates a driving signal with set dead times with respect to the primary side PWM signal.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 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 shutoff the drive output during discontinuous mode condition.

• Possibility to operate in discontinuous mode
• Automatic turnoff for duty-cycle less than 14%
• 20 to 500kHz Operating frequency
• 700ns Inhibit blanking time

Applications

Power Management