FAN6250M6X Secondary Side Synchronous Rectifier Controller for Flyback Converters Description The FAN6250M6X is a secondaryside synchronous rectifier (SR) www.onsemi.com controller for an isolated flyback converter operating in Discontinuous Conduction Mode (DCM). The adaptive dead time control algorithm minimizes the body diode conduction of SR MOSFET while guaranteeing stable and robust SR operation against noise and disturbance caused by the circuit parasitic. SOT23, 6 Lead CASE 527AJ Programmable thermal ShutDown (SD) function that is informing primary side controller to shutdown the power system when pairing MARKING DIAGRAM with PSR controller FAN1080. The Dynamic Response Enhancement (DRE) function that minimizes system response time when pairing with PSR controller FAN1080. Features PXXEX Works in Discontinuous Conduction Modes (DCM) and Boundary Conduction Modes (BCM) Adaptive Turnoff Trigger Blanking Time for Wide SR MOSFET ... = Year Code Application PXX = 250 : FAN6250 E X = Die Run Code Gate Turnon Blanking Time (minimum Gate OFF Time) = Date Code Dynamic Response Enhancement (DRE) Function that minimizes System Response Time PIN CONNECTIONS Programmable ShutDown (SD) Protection Minimum Turnon Delay (20 ns) DRAIN GATE Input Voltage (VIN) Range for LDO Input: 3.25 V to 20 V Fewest External Components Allowed VIN GND Accurate Turn Off Dead Time Regulation when working with PSR Power System SD VDD Small Footprint: SOT23 6 Pin This is a PbFree Device Typical Applications Travel Adapter for Smart Phones, Feature Phones, and Tablet PCs ACDC Adapters for Portable Devices that Require CV/CC Control ORDERING INFORMATION Part Number Operating Temperature Package Packing Method FAN6250M6X 40C to 125C 6 Lead, SOT23 (PbFree) 3000 / Tape & Reel For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D Semiconductor Components Industries, LLC, 2018 1 Publication Order Number: October, 2018 Rev. 0 FAN6250M6X/DFAN6250M6X L PI FUSE + B C SNU N R P N SNU S V + C o O C R CL CL CE1 CE2 R START V ac D SNU R SER NTC L GND D VDD R VDD MOSFET DRAIN VIN GND C VDD FAN6250 R CDC R D G G GATE SD VDD FAN1080 N A AUX Gate R VS1 VDD CS R R R CSS CS VS GND R R VS2 OTP C VS Figure 1. FAN6250 Typical Application Schematic VDD VIN Turnon SR COND Trigger + LDO Blanking V IN ON / V IN OFF DRAIN t <t S SLODIS VIN I DRE + T Slope ARM Detection SET V TH ARM D Q GATE + V Turnon THON CLR Q V + DRE t > t S DREEN Turnoff V THOFF VDD + I SD SD On time controlling V SDTH Turnoff Trigger Blanking Minimum Turn SR COND On Time GND Figure 2. FAN6250 Function Block Diagram www.onsemi.com 2