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RT7305 Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT7305 Datasheet(HTML) 1 Page - Richtek Technology Corporation |
1 / 14 page RT7305 Copyright © 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation DS7305-00 July 2014 www.richtek.com 1 Primary-Side Regulation LED Driver Controller with Active-PFC and Integrated Power MOSFET General Description The RT7305 consists of a high voltage power MOSFET and a high-performance constant current LED driver with active power factor correction. It supports high power factor across a wide range of line voltages, and it drives the converter in the Quasi-Resonant (QR) mode to achieve higher efficiency. By using Primary Side Regulation (PSR), RT7305 controls the output current accurately without a shunt regulator and an opto-coupler at the secondary side, reducing the external component count, the cost, and the volume of the driver board. RT7305 embeds comprehensive protection functions for robust designs, including LED open circuit protection, LED short circuit protection, output diode short-circuit protection, VDD Under-Voltage Lockout (UVLO), VDD Over-Voltage Protection (OVP), Over-Temperature Protection (OTP), and cycle-by-cycle current limitation. Applications AC/DC LED Lighting Driver Features Integrated 620V Power MOSFET Tight LED Current Regulation No Opto-Coupler and TL431 Required Power Factor Correction (PFC) Quasi-Resonant Maximum/Minimum Switching Frequency Clamping Maximum/Minimum on-Time Limitation Wide VDD Range (up to 25V) Multiple Protection Features LED Open-Circuit Protection LED Short-Circuit Protection Output Diode Short-Circuit Protection VDD Under-Voltage Lockout VDD Over-Voltage Protection Over-Temperature Protection Cycle-by-Cycle Current Limitation RoHS Compliant and Halogen Free Simplified Application Circuit Flyback Application Circuit BD1 COMP DRAIN RT7305 VDD Line Neutral ZCD CCOMP CVDD RST CIN CS RCS RPC GND DAUX SOURCE COUT DOUT TX1 RZCD1 RZCD2 VOUT+ VOUT- Buck-Boost Application Circuit BD1 COMP DRAIN RT7305 VDD ZCD CCOMP CVDD RST CIN DAUX COUT DOUT TX1 RZCD1 RZCD2 Line Neutral VOUT+ VOUT- CS RCS RPC GND SOURCE |
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