88EM8040/88EM8041
Power Factor Correction Controller for Flyback Topology
Datasheet
PRODUCT OVERVIEW
The Marvell® 88EM8040/88EM8041 device is a high
performance Power Factor Correction (PFC) Controller for
flyback applications. Both devices work at fixed frequencies,
88EM8040 at 60kHz while 88EM8041 at 120kHz. It can be used
in a wide variety of universal input PFC flyback converters with
an output power range of up to 150W without using any external
driver.
General Features
Patented DSP control with adaptive loop coefficient
Continuous Conduction Mode (CCM) operation
Average current mode control
Adaptive control loop achieves high power factor for a
wide range of voltage and load conditions
Adaptive over current protection for universal voltage
Fixed frequency of operation
Marvell advanced mixed signal technology ensures the lowest
Total Harmonic Distortion (THD) in the industry. The IC operates
under average Continuous Conduction Mode (CCM).
High power factor and low harmonic distortion for a wide
range of load conditions
The 88EM8040/88EM8041 PFC controller improves the steady
state and transient performance through Marvell's innovative
Digital Signal Processing (DSP) solution. The proprietary
adaptive over-current protection has the ability to ensure almost
constant power constraint and provides safety provisions
including open loop and over voltage protection protocols.
Up to 2A driver capability
Minimal external components required
Under voltage lockout (UVLO)
Over voltage protection (OVP)
Thermal shutdown
Input line frequency range from 45Hz to 65Hz
The internal voltage loop compensation and current loop control
guarantees system stability and thus reduces the external
component count and costs.
Applications
Universal input PFC flyback converters
AC/DC adaptors and battery charger
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 any flyback application with PFC.
Figure 1: PFC Flyback Circuit Diagram
DR2
VDCin
Vout
Bridge
Retifier
diode
PFC
Np
Cin
Csn
NS2
Rsn
Load
CO2
Dsn
Rgate
Drain
AC
IN
Rsen
Q1
Rcs
OCP SW SGND
RS1
Ccs
Ra
88EM8040/
8041
Rb
Rc
ISNS
VIN
PGND
RS4
CS2
VDD
FB
CS1 RS5
RS2
Opto-Coupler
CVDD
Rf1
Vref
RS3
Copyright © 2009 Marvell
October 5, 2009, Preliminary
Doc. No. MV-S104983-01 Rev. A
Page 3
Document Classification: Proprietary
MARVELL [ MARVELL TECHNOLOGY GROUP LTD. ]
