FAN6204MY ON Semiconductor

FAN6204 mWSaver Synchronous Rectification Controller for Flyback and Forward Freewheeling Rectification February 2016 FAN6204 mWSaver Synchronous Rectification Controller for Flyback and Forward Freewheeling Rectification Features Description mWSaver Technology: FAN6204 is a secondary-side synchronous rectification (SR) controller to drive SR MOSFET for improving - Internal Green Mode to Stop SR Switching for efficiency. The IC is suitable for flyback converters and Lower No-Load Power Consumption forward free-wheeling rectification. - 1.1 mA Ultra-Low Green Mode Operating Current FAN6204 can be applied in continuous or discontinuous conduction mode (CCM and DCM) and quasi-resonant SR Controller (QR) flyback converters based on the proprietary Suited for Flyback Converter in QR, DCM, and innovative linear-predict timing-control technique. The CCM Operation benefits of this technique include a simple control method without current-sense circuitry to accomplish Suited for Forward Freewheeling Rectification noise immunity. PWM Frequency Tracking with Secondary-Side With PWM frequency tracking and secondary-side Winding Voltage Detection winding voltage detection, FAN6204 can operate in both Ultra-Low VDD Operating Voltage for Various Output fixed- and variable-frequency systems. Voltage Applications (5 V~24 V) In Green Mode, the SR controller stops all SR switching V Pin Over-Voltage Protection (OVP) DD operation to reduce the operating current. Power consumption is maintained at minimum level in light- 12 V (Typical) Gate Driver Clamp load condition. 8-Pin SOP Package Applications AC/DC NB Adapters Open-Frame SMPS Battery Charger Ordering Information Operating Part Number Package Packing Method Temperature Range FAN6204MY -40C to +105C 8-Pin, Small Outline Package (SOP) Tape & Reel 2014 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6204 Rev. 1.4 FAN6204 mWSaver Synchronous Rectification Controller for Flyback and Forward Freewheeling Rectification Application Diagrams V IN V I OUT SR V IN V OUT Q 1 Q 2 Q 2 V DET Q 1 GATE VDD R R 3 3 GATE VDD 3 5 R 3 5 1 R 1 RES LPC Q RES 2 LPC 8 7 V FAN6204 V LPC RES 8 7 FAN6204 R R 4 2 4 6 R R 2 4 6 4 AGND GND GND AGND Figure 1. Typical Application Circuit for Figure 2. Typical Application Circuit for Flyback Converter Forward Freewheeling Rectification Internal Block Diagram GATE 3 Internal VDD 5 Bias 950K 0.05V DD + 50K - 4.8V/4.5V Green V Calculate LPC-EN Mode AGND + OVP 1 V LPC-EN 27.5V/25.4V - 2V t DIS 2 AGND - 1s Drive S Q Blanking + LPC 8 PWM Block Rising 6 AGND R Q Edge 0.05V DD + Frequency - V CT Enable Tracking RESET Detector i i DISCHR CHR t SR-MAX 5A/V 1A/V C T Causal RESET Function 4 7 RES GND Figure 3. Functional Block Diagram 2014 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6204 Rev. 1.4 2