AN3011 datasheet(1/37 Pages) STMICROELECTRONICS

Part #	AN3011

Description	In certain applications such as LCD or plasma TVs

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 37 page

January 2011

Doc ID 16043 Rev 1

1/37

AN3011

Application note

Wide range input (90 - 265), single output (5 V-11 W)

EVLVIP27H-12SB, VIPer27 demonstration board

Introduction

In certain applications such as LCD or plasma TVs, desk top computers, etc., the power

supply that converts the energy from the mains often includes two modules: the main power

supply that provides most of the power which is off when the application is off or in standby

mode, and the auxiliary power supply that only provides energy to specific parts of the

equipment, like the USB ports, remote receivers, or modems, but stays on when the

application is in standby mode.

In standby mode it is often required that the equipment input power is as low as possible,

which means reducing the input power of the auxiliary power supply, in no-load or light-load

conditions, as low as possible. This demonstration board meets the specifications of a wide

range of auxiliary power supplies for the above mentioned applications. Furthermore, it is

optimized for very low standby consumption which helps to meet the most stringent energy

saving requirements. Using the VIPer27, which has a switching frequency of 115 kHz, helps

to reduce the transformer size.

Figure 1.

Demonstration board image

www.st.com

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