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Akros Silicon

AS1124 Datasheet Preview

AS1124 Datasheet

24W Powered Device

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AS1124 24W Powered Device with Integrated DC-DC Controller
GENERAL DESCRIPTION
The AS1124 is a single-chip, highly integrated CMOS solution for
Power over Ethernet (PoE). Applications include Voice over IP
(VoIP) Phones, Wireless LAN Access Point, Security and Web
Cameras, Analog Telephone Adapters (ATA) and Point of Sales
Terminals.
The AS1124 provides the functions required for power over
Ethernet Powered Device (PD) applications.
The AS1124 integrates rectification and protection circuitry, a PD
controller, and a DC-DC converter. This high level of integration
provides faster ressponse to surge events and limits stray surge
current from passing through sensitive circuits, such as the
Ethernet PHY device. The device is designed to provide a safe
low impedance discharge paths directly back to the earth ground,
resulting in superior reliability and circuit protection.
AS1124 has been architected and designed to address both EMI
emission concerns and surge/over-voltage protection in POE
applications. AS1124 implements many design features that
minimizes transmission of system common-mode noise on to the
UTP while providing high immunity to over-voltage and surge
events.
By using high-volume standard CMOS technology, Akros enables
its customers to implement higher performance PoE devices with
low cost and a small footprint.
TYPICAL APPLICATIONS
Pan, Tilt and Zoom (PTZ), security and Web Cameras
Analog Telephone Adapters (ATA)
Point of Sale (PoS)Terminals
Wireless LAN Access Points
Voice over IP (VoIP) phones
SIMPLIFIED APPLICATION DIAGRAM
FEATURES
The AS1124 is fully integrated and architected at a system level to
provide the following features:
Fully supports IEEE® Std. 802.3af-2003 and supports draft IEEE®
Std. 802.3at r0.9 power requirements
Meets IEC 61000-4-2/3/4/5/6 requirements
Meets IEC 60950 over-voltage protection requirements
Integrated rectification for superior high voltage protection
Integrated DC-DC converter, provides exceptional EMI
performance
Programmable DC current limit up to 800 mA
Supports “two finger” classification for draft IEEE® Std. 802.3at
r0.9 higher power PD applications
Provides seamless support for local power
Over temperature protection
Industrial temperature range, -40ºC to +85ºC
5x5 mm, 20 lead QFN Package, RoHS compliant
Application Diagram for a PoE PD (Flyback Converter)
Akros Silicon, Inc.
6399 San Ignacio Avenue, Suite 250, San Jose, CA 95119 USA
408.746.9000 www.AkrosSilicon.com




Akros Silicon

AS1124 Datasheet Preview

AS1124 Datasheet

24W Powered Device

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AS1124
TABLE OF CONTENTS   
GENERAL DESCRIPTION........................................................................................................................................................... 1
TYPICAL APPLICATIONS ........................................................................................................................................................... 1
FEATURES .................................................................................................................................................................................. 1
EXAMPLE APPLICATION............................................................................................................................................................ 1
APPLICATION DIAGRAM FOR A POE PD (FLYBACK CONVERTER) ...................................................................................... 1
FIGURES ..................................................................................................................................................................................... 3
TABLES ....................................................................................................................................................................................... 3
PIN DIAGRAM ............................................................................................................................................................................. 4
TYPICAL PERFORMANCE CHARACTERISTICS....................................................................................................................... 7
FUNCTIONAL DESCRIPTION ................................................................................................................................................... 10
OVERVIEW OF POE .................................................................................................................................................................10
AS1124 POE DESIGN ...............................................................................................................................................................10
POWER FEED ALTERNATIVES FOR 10/100 SYSTEMS......................................................................................................... 11
AS1124 OVERVIEW .................................................................................................................................................................. 12
RECTIFICATION & PROTECTION ............................................................................................................................................ 12
PD CONTROLLER.....................................................................................................................................................................12
MODES OF OPERATION ..........................................................................................................................................................12
RESET .......................................................................................................................................................................................12
SIGNATURE DETECTION MODE .............................................................................................................................................12
CLASSIFICATION MODE ..........................................................................................................................................................12
LOCAL POWER MODE .............................................................................................................................................................13
IDLE MODE ...............................................................................................................................................................................13
ON STATE .................................................................................................................................................................................13
PD CONTROL POWER AND THERMAL PROTECTIONS........................................................................................................ 13
UNDER VOLTAGE LOCKOUT (UVLO) .....................................................................................................................................13
CURRENT LIMIT/CURRENT SENSE ........................................................................................................................................13
THERMAL LIMIT PROTECTION................................................................................................................................................13
POE POWER-ON STARTUP WAVEFORM............................................................................................................................... 14
DC-DC CONTROLLER .............................................................................................................................................................. 15
OVERVIEW ................................................................................................................................................................................ 15
CURRENT-LIMIT/CURRENT SENSE........................................................................................................................................15
LOW LOAD CURRENT OPERATION........................................................................................................................................15
COMPENSATION AND FEEDBACK .........................................................................................................................................15
SOFT-START INRUSH CURRENT LIMIT .................................................................................................................................15
AUXILIARY POWER OPTION ................................................................................................................................................... 15
DC-DC CONVERTER TOPOLOGIES........................................................................................................................................ 15
FLYBACK VS. FORWARD OPERATION...................................................................................................................................15
BUCK OPERATION ...................................................................................................................................................................15
PRIMARY SWITCHING TOPOLOGY ........................................................................................................................................15
THERMAL DE-RATING AND BOARD LAYOUT CONSIDERATIONS.......................................................................................16
AS1124 PCB FOOTPRINT ........................................................................................................................................................ 16
APPLICATION CIRCUITS.......................................................................................................................................................... 17
PHYSICAL DIMENSIONS.......................................................................................................................................................... 19
CONTACT INFORMATION........................................................................................................................................................20
IMPORTANT NOTICES .............................................................................................................................................................20
LEGAL NOTICE .........................................................................................................................................................................20
Akros Silicon, Inc.
6399 San Ignacio Avenue, Suite 250, San Jose, CA 95119 USA
408.746.9000 www.AkrosSilicon.com


Part Number AS1124
Description 24W Powered Device
Maker Akros Silicon
Total Page 21 Pages
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