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| Marvell 88EM8041 Digital Power Factor Correction Controller - Smart Green Technology PRODUCT OVERVIEW The Marvell(R) 88EM8041 is a high performance, low-cost single stage power factor correction (PFC) controller for flyback applications. This device can be used in PFC flyback converter applications including adapters and battery chargers with output ranges up to 150W without using any external driver. The operational switching frequency of this device can be chosen from three selectable frequencies through an external resistor (RFset). The 88EM8041 also provides a soft-start feature for start-up conditions. The powerful adaptive driver self-adjusting feature allows for flexibility over a wide range of MOSFET sizes, while reducing the electromagnetic interference (EMI). Through Marvell's innovative digital signal processing (DSP) solution, the 88EM8041 controller improves the steady state and transient performance. The combination of the adaptive loop coefficients in parallel with the DSP solution elevates industry standards for PFC controllers. The proprietary adaptive over-current protection ability ensures high system reliability. The safety provisions include open loop and a high voltage protection protocol. The 8-pin SOIC RoHS compliant package facilitates the application design process by minimizing the requirements for external components as well as for board space. This guarantees simple system design at a minimum cost making the 88EM8041 the best choice for any flyback application with PFC. BLOCK DIAGRAM Transformer Fuse Do Chf Co1 + Lo Co2 + 16VDC GND Rectifier Rin1 EMI Filter Rin2 88EM8041 1 PGND Cin 2 SGND 3 Isns 4 Vin SW 8 VDD 7 FSET 6 FB 5 RFset RFB 3 VDD Mosfet VDD 6 5 4 Ropto Opto 1 TL431 2 1 - + Ro1 2 Ro2 Rsns Rin3 Fig 1. 88EM8041 Block Diagram ref Marvell 88EM8041 FEATURES * Energy savings of up to 50% * Patented DSP control strategy * Programmable switching frequency * Soft-start * High power factor and low harmonic performance for a wide range of load conditions * Adaptive over current protection for universal voltage level * Fast dynamic performance during input and load transient states * Optimized total solution to reduce EMI and filter size * Adaptive gate driver for applications between 10W-150W * Minimal external components required * Under Voltage Protection (UVLO) * Over Voltage Protection (OVP) * Thermal shutdown APPLICATIONS * PFC flyback converters * AC/DC adapters * Battery chargers * Lighting control MARVELL LAPTOP ADAPTER * 90W/20V * Unity power factor * Smallest size at 130mm x 55mm x 16mm Fig 2. Marvell Laptop Adapter THE MARVELL ADVANTAGE: Marvell products come with complete reference designs which include board layout designs, software, manufacturing diagnostic tools, documentation, and other items to assist customers with product evaluation and production. Marvell's worldwide field application engineers collaborate closely with end customers to develop and deliver new leading-edge products for quick time-to-market. Marvell utilizes worldleading semiconductor foundry and packaging services to reliably deliver high-volume and low-cost total solutions. ABOUT MARVELL: Marvell is a leader in storage, communications, and consumer silicon solutions. Marvell's diverse product portfolio includes switching, transceiver, communications controller, processors, wireless, power management, and storage solutions that power the entire communications infrastructure, including enterprise, metro, home, and digital entertainment applications. For more information, visit our Web site at www.marvell.com. Marvell Semiconductor, Inc. 5488 Marvell Lane Santa Clara, CA 95054 Phone 408.222.2500 www.marvell.com Copyright (c) 2009. Marvell International Ltd. All rights reserved. Marvell, Moving Forward Faster, the Marvell logo, Alaska, AnyVoltage, DSP Switcher, Fastwriter, Feroceon, Libertas, Link Street, PHYAdvantage, Prestera, TopDog, Virtual Cable Tester, Yukon, and ZJ are registered trademarks of Marvell or its affiliates. CarrierSpan, LinkCrypt, Powered by Marvell Green PFC, Qdeo, QuietVideo, Sheeva, TwinD, and VCT are trademarks of Marvell or its affiliates. All other trademarks are the property of their respective owners. 88EM8041-003 1/09 |
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