Application Note
Revision 2.0
www.infineon.com
2017-05-03
DG_201701_PL21_004
Design guide IDP2303(A)
Design guide for TV power supply with digital multi -mode PFC + LLC
combo IC IDP2303(A)
About this document
Scope and purpose
This design guide is to help customers design a TV power supply using an Infineon digital controller. It provides
guidelines on power stage design, control parameters and protection settings as well as PCB layout and
dpVision GUI usage.
Intended audience
This document is intended for design engineers that want to design a high performance TV power supply using
Infineon's digital multi-mode PFC + LLC combo IC.
Table of contents
About this document .............................................................................................................................................1
Table of contents ...................................................................................................................................................1
1
Abstract ..............................................................................................................................................3
2
Introduction .......................................................................................................................................4
2.1
IC Introduction ........................................................................................................................................ 4
2.2
Pin configuration and description .......................................................................................................... 4
2.3
Product highlights ................................................................................................................................... 5
2.4
Application .............................................................................................................................................. 6
3
PFC design ..........................................................................................................................................7
3.1
Target specifications ............................................................................................................................... 7
3.2
Power stage ............................................................................................................................................. 7
3.2.1
Bridge rectifier .................................................................................................................................... 7
3.2.2
Selection of power MOSFET ............................................................................................................... 8
3.2.3
MOSFET gate driving .......................................................................................................................... 9
3.2.3.1
Unique gate drive concept ........................................................................................................... 9
3.2.3.2
Gate drive stability ........................................................................................................................ 9
3.2.3.3
Other design tips for the gate driving circuit ............................................................................. 10
3.2.4
Boost diode ...................................................................................................................................... 10
3.2.5
Boost inductor .................................................................................................................................. 10
3.3
Control parameters and protections .................................................................................................... 12
3.3.1
Output voltage sense and protections ............................................................................................ 12
3.3.2
Redundant OVP (ROVP) .................................................................................................................... 13
3.3.3
PFC ZCD divider design .................................................................................................................... 15
3.3.4
Current sense and Over Current Protection (OCP) ......................................................................... 15
3.3.4.1
Over Current Protection(OCP) tolerance & selection of current sense resistor ....................... 16
3.3.4.2
Verification of PFC inductance with OCP tolerance .................................................................. 19
3.3.5
Frequency law for multi-mode PFC ................................................................................................. 19
3.3.5.1
Multimode PFC ............................................................................................................................ 19
3.3.5.2
Frequency law ............................................................................................................................. 20
3.3.5.3
Setting of
𝒇𝒎𝒊𝒏
and
𝒇𝒎𝒂𝒙
........................................................................................................ 21
