Marvell 88EM8040/88EM8041
Digital Power Factor Correction Controller
For Flyback Applications
PRODUCT OVERVIEW
The Marvell® 88EM8040/88EM8041 is a high performance, low-cost, minimum component count controller for
Flyback/Adapter applications. The single-stage PFC controller can be used for a wide variety of adapters and other
power supply and lighting applications with output power ranges up to 150W.
The 88EM8040/88EM8041 includes the Marvell patented adaptive control-loop design to achieve a power factor up
to 0.99 and the lowest Total Harmonic Distortion (THD) in the industry, enabling a wide range of voltage and load
conditions for more reliable and robust power supplies.
Unlike traditional analog PFC based solutions, the 88EM8040/88EM8041 utilizes Marvell’s innovative Digital Signal
Processing (DSP) solution improving the steady state and transient performance. This offers customers the smallest
package and lowest system bill of materials (BOM). The combination of the adaptive control loop design built on top
of the DSP solution elevates industry standards for PFC controllers.
Both devices work at fixed frequencies, 88EM8040 at 60kHz while 88EM8041 at 120kHz. The IC operates under
Continuous Conduction Mode (CCM) or Discontinuous Conduction Mode (DCM) or both combined together operating
in Mixed Mode. The internal voltage loop compensation and current loop control guarantee system stability and thus
reduce the external component count and costs.
The 8-pin SOIC package further facilitates the application design process, saving board space. The resultant simple
system design and minimum cost makes 88EM8040/88EM8041 the ideal choice for PFC controllers.
APPLICATIONS
Devices powered by the Marvell 88EM8040/8041 include the following applications:
• Adapters
• Low power output (<150W) power supplies
• Printer power supplies
• General lighting control
88EM8040/8041 APPLICATIONS SCHEMATIC DIAGRAM
PFC
HVDC
Cf
Rh
L
Db
VOUT
Ce
Cg
Bridge
Rectifier
Cd
Rm
T1
Da
Opto-Coupler
N
Qa
Rg
Ck
Ch
Re
ISNS
Rb
Ca
VIN
Rp
U1
Cc
Rc
Rn
Rf
Ra
OCP
Marvell
88EM8040/
8041
FB
U2
SGND
Rk
VREF
PGND
SW
VDD
VDD
P/O Opto-Coupler
Cb
Rd
Fig 1. 88EM8040/8041 Block Diagram - Isolated Single-Stage Flyback Converter
Rs
Marvell 88EM8040/88EM8041
FEATURES
BENEFITS
• Proprietary DSP control with adaptive loop coefficient
• Up to 0.99 power factor and low total harmonic distortion for a wide
range of line and load conditions
• Continuous Conduction Mode (CCM) / Discontinuous Conduction Mode
(DCM) / CCM and DCM Mixed Mode of operation
• Higher efficiency; Transformer size up to 50% smaller
• Average current mode control
• No slope compensation required
• Adaptive voltage control loop
• High power factor and low THD under high input voltage and low load
conditions
• 1.2A (typical) driver capability
• Higher power capability up to 150W
• Adaptive over current protection for universal input voltage
• Improved protection and increased reliability
• No external compensation
• Reduce design time, component count and costs
• Built-in under voltage lockout (UVLO)
• Over voltage protection (OVP)
• Thermal shutdown
• Fixed operating frequency: 60kHz (8040), 120kHz (8041)
• Input line frequency range between 45Hz-65Hz
• Universal input applications
EVALUATION BOARD – 90W Adapter
MARVELL POWERSMART PFC™
LAPTOP ADAPTER
• 90W/20V
• Unity power factor
• Smallest size at 130mm x 55mm x 16mm
Fig 2. Marvell POWERSMART PFC™ Laptop Adapter
PLATFORM SUPPORT
FUTURE DERIVATIVES
• Flyback converter evaluation board – 90W Adapter
• Networking
• Flyback converter reference designs – 90W and 36W
• Wireless
• Control Software Stack
THE MARVELL ADVANTAGE: Marvell chipsets 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 world-leading 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, processor, wireless, power management, and storage solutions that power the entire
communications infrastructure, including enterprise, metro, home, storage, and digital entertainment solutions. 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 © 2010. Marvell International Ltd. All rights reserved. Marvell, Moving Forward
Faster, and the Marvell logo are registered trademarks of Marvell or its affiliates.
PowerSmart PFC is a trademark of Marvell or its affiliate. All other trademarks are the
property of their respective owners.
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