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This literature is subject to all applicable copyright laws and is not for resale in any manner.FAN7631 Advanced PFM Controller for Half-Bridge Resonant Converters April 2012 FAN7631 Advanced Pulse Frequency Modulation (PFM) Controller for Half-Bridge Resonant Converters Features Description The FAN7631 is a pulse-frequency modulation controller Variable Frequency Control with 50% Duty Cycle for high-efficiency half-bridge resonant converters that for Half-Bridge Resonant Converter Topologies includes a high-side gate drive circuit, an accurate High Efficiency with Zero-Voltage-Switching (ZVS) current-controlled oscillator, and various protection functions. The FAN7631 features include variable dead Up to 600kHz Operating Frequency time, operating frequency up to 600kHz, protections such Built-in High-Side Gate Driver as LUVLO, and a selectable latch or A/R protection using High Gate-Driving Current: +500mA/-1000mA the LS pin for user convenience. Programmable Dead Time with a Resistor The Zero-Voltage-Switching (ZVS) technique reduces the switching losses and improves the efficiency significantly. Pulse Skipping and Burst Operation for Frequency ZVS also reduces the switching noise noticeably, which Limit (Programmable) at Light-Load Condition allows a small Electromagnetic Interference (EMI) filter. Simple Remote On/Off Control with Latch or Auto-Restart (A/R) Using FI or LS Pin Offering everything necessary to build a reliable and robust resonant converter, the FAN7631 simplifies Protection Functions: Over-Voltage Protection designs and improves productivity and performance. The (OVP), Overload Protection (OLP), Over-Current FAN7631 can be applied to resonant converter Protection (OCP), Abnormal Over-Current Protection topologies such as series resonant, parallel resonant, (AOCP), Internal Thermal Shutdown (TSD), and and LLC resonant converters. High Precise Line Under-Voltage Lockout (LUVLO) Level-Change OCP Function During Startup Related Resources AN4151 Half-Bridge LLC Resonant Converter Design Applications Using FSFR-Series Fairchild Power Switch (FPS) PDP and LCD TVs Desktop PCs and Servers Video Game Consoles Adapters Telecom Power Supplies Ordering Information Operating Junction Packaging Part Number Package Temperature Method FAN7631SJ Tube -40C ~ 130C 16-Lead, Small-Outline Package (SOP) FAN7631SJX Tape & Reel 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN7631 1.0.2