FLS3217 / FLS3247 Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET July 2014 FLS3217 / FLS3247 Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET Features Description This highly integrated PWM controller with power Cost-Effective Solution without Input Bulk Capacitor MOSFET, FLS3217 / FLS3247, provides several and Feedback Circuitry features to enhance the performance of low-power Power-Factor Correction (PFC) flyback converters. The proprietary topology enables simplified circuit design for LED lighting applications. Integrated Power MOSFET By using the single-stage topology with primary-side Accurate Constant-Current (CC) Control regulation, an LED lighting board can be implemented Independent Online Voltage, Output Voltage, and with the few external components and minimized cost Magnetizing Inductance Variation requiring no input bulk capacitor or feedback circuitry. Linear Frequency Control for Increased Efficiency To implement good power factor and low THD, constant on-time control is utilized with an external capacitor Open / Short-LED Protection connected to COMI. Cycle-by-Cycle Current Limiting Precise constant-current control regulates accurate Over-Temperature Protection with Auto Restart output current versus changes in input voltage and output voltage. The operating frequency is proportionally Low Startup Current: 20 A changed by the output voltage to guarantee DCM Low Operating Current: 5mA operation with higher efficiency and simple design. V Over-Voltage Protection (OVP) DD FLS3217 and FLS3247 provide protection features such as open-LED, short-LED, and over-temperature V Under-Voltage Lockout (UVLO) DD protection. The current-limit level is automatically Application Voltage Range: 80 V ~ 308 V reduced to minimize the output current and protect AC AC external components in short-LED condition. Applications LED Lighting System Ordering Information Operating Part Number Package Packing Method Temperature Range FLS3217M 7-Lead, Small Outline Package (SOIC) Tape & Reel FLS3217N -40C to +125C 7-Lead, Small Outline Package (DIP) Tube FLS3247N . 2012 Fairchild Semiconductor Corporation www.fairchildsemi.com FLS3217 / FLS3247 Rev. 1.0.1 FLS3217 / FLS3247 Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET - + - + Application Diagram BRIDGE DIODE TRANS LINE INPUT FUSE 2 VDD DRAIN 7 NC 6 COMI 5 4 VS 3 GND CS 1 Figure 1. Typical Application Internal Block Diagram DRAIN 7 Internal Shutdown Bias Max. Duty Gate V Good DD Controller Driver VDD 2 + V - OVP S Q OCP Level VS Controller R V OCP + OSC - LEB 1 CS S Q Sawtooth - R TSD Generator + V Good DD 5 COMI NC 6 Error Amp. t DIS DCM Frequency Detector Controller TRUECURRENT V REF Freq. Calculation Auto Restart Protection: 4 VS OVP (Over-Voltage Protection) GND 3 UVLO (Under-Voltage Lockout) OTP (Over-Temperature Protection) VS Sample & Hold Figure 2. Functional Block Diagram 2012 Fairchild Semiconductor Corporation www.fairchildsemi.com FLS3217 / FLS3247 Rev. 1.0.1 2