Functional Description
Overview
3
3.1
Functional Description
Overview
The 88EM8040/88EM8041 is a high performance, low-cost with minimum component count Power
Factor Correction (PFC) Controller. The device is used for controlling Universal input flyback
converters in systems or standalone products. The high performance of 88EM8040/88EM8041 is
accompanied with its small size and simplicity of application.
shows the top level block
diagram.
Figure 3: Top Level Block Diagram
88EM8040/8041
Oscillator
Clock
Over
Temperature
T
_over
V
o_over
I
_over
Protection
Management
Fault
Current
Protection
I
_over
ISNS
Current
Amplifier
Driver Disable
MUX
Switcher
&
ADC
Gate
Driver
SW
FB
Output
Voltage Level
Detect
State Machine
V
o_over
DSP
Core
VIN
Zero Cross
Detect
Current
Protection
Threshold
Selection
Power
Distribution
and
Bandgaps
Serial Data
Interface
Startup Setting
or
Frequency
Setting
PGND
SGND
VDD
OCP
Note
I
_over
, V
o_over
, and T
_over
are the over current, over voltage, and over temperature
signals respectively.
Copyright © 2009 Marvell
October 5, 2009, Preliminary
Document Classification: Proprietary
Doc. No. MV-S104983-01 Rev. A
Page 19
MARVELL [ MARVELL TECHNOLOGY GROUP LTD. ]
