RT7300 Active PFC Controller with Critical Conduction Mode General Description Features Critical Conduction Mode (CRM) Operation The RT7300 is an active Power Factor Correction (PFC) Constant On-Time Control (Voltage Mode) controller with critical conduction mode (CRM) operation Near Unity Power Factor that is designed to meet line current harmonic regulations Ultra Low Start-up Current (<20A) for the applications of AC/DC adapters, electronic ballasts Input Voltage Feed-Forward Compensation and medium off-line power converters (<300W). The CRM Wide Supply Voltage Range from 12V to 25V and Feed-Forward schemes provide near unity power factor Totem Pole Gate Driver with 600mA/800mA across a wide range of input voltages and output powers. Maximum Frequency Clamping (120kHz) The totem-pole gate driver with 600mA sourcing current DCM THD Optimization and 800mA sinking current provides powerful driving Fast Dynamic Response capability for P-MOSFET to improve conversion efficiency. Light Load Burst Mode Operation The RT7300 features an extra low start-up current (20A) Brown-in/Brown-out Detection and supports a disable function to reduce power Disable Function consumption in standby mode, which makes it easy to Maximum/Minimum On-Time Limit comply with energy saving regulations such as Blue Angel, Cycle-by-Cycle Current Limit Energy Star and Energy 2000. Output Over Voltage Protection (OVP) This controller integrates comprehensive safety protection Output Under Voltage Protection (UVP) functions for robust designs including input under voltage Under Voltage Lockout (UVLO) lockout, output over voltage protection, under voltage RoHS Compliant and Halogen Free protection and cycle-by-cycle current limit. The RT7300 is a cost-effective solution for PFC power converter with minimum external components. It is available in the SOP-8 package. Simplified Application Circuit BD L D PFC OUT Line V + OUT R G Q1 C SIN C OUT R CS Neutral V - OUT GD R ZCD R ZCD OUT1 CS RT7300 R AUX INV VDD D VDD C C VDD INV R OUT2 R START COMP R FF1 R COMP FF C COMP2 R C FF2 FF C COMP1 GND Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS7300-01 December 2013 www.richtek.com 1RT7300 Applications Marking Information Electrical Lamp Ballast RT7300GS : Product Number RT7300 LED Lighting YMDNN : Date Code GSYMDNN AC/DC Adapter/Charger for Desktop PC, NB, TV, Monitor, Etc. Entry-Level Server, Web Server Pin Configurations (TOP VIEW) Ordering Information RT7300 8 INV VDD Package Type 2 7 COMP GD S : SOP-8 3 6 FF GND 4 Lead Plating System CS 5 ZCD G : Green (Halogen Free and Pb Free) SOP-8 Note : Richtek products are : RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS7300-01 December 2013 2