南芯/SOUTHCHIP SC3503SBER SOT23-6

　　Description

　　SC3503 is a smart secondary-side driver IC designed todrive N-Channel power MOSFET used as synchronousrectifiers in isolated flyback converters. The MOSFET canreplace Schottky diode so the system can achieve higherefficiency and superior heat dissipation performance.

　　The SR MOSFET is turned on when VDS falls below turn-onthreshold, and turned off when VDS exceeds turn-offthreshold. The SR conduction voltage drop is continuouslymonitored to minimize the conduction loss. The extremelyfast turn-off comparator and driving circuitry ensures thesafety of the SR MOSFET, even in current continuous mode(CCM) condition.

　　The IC can work well in wide output voltage range, even inshort circuit conditions. The patented turn on detectioncircuity prevents SR turn on when Vds rings severely. Thewide VDD range and gate driver technology make thecontroller ideal for wide output voltage range applications,such as adapters, chargers, USB Power Delivery (USB-PD),

　　etc.

　　This chip supports both high side rectification and low siderectification.

　　Features

　　Wide output range, even down to 0V.

　　No need of auxiliary winding for power supply.

　　Patented programmable turn on detection circuitry

　　prevents MOSFET from mistake turn-on.

　　Compliant with multiple types of MOSFETs

　　High efficiency can meet CoC V5 and DoE VI.

　　10nS turn off propagation delay

　　High switching frequency up to 1MHz.

　　Extremely low quiescent current leads to low stand by

　　power.

　　Supports DCM, CCM, and Quasi-Resonant mode

　　converters.

　　Supports both high and low side synchronous

　　rectification.

　　SOT23-6 package available.

　　Applications

　　Universal AC-DC Adaptors

　　USB PD and QC Chargers

　　Flyback Power Supplies with Variable Output Voltage

　　AC-DC auxiliary supplies