AS1124 Datasheet, PDF (1/21 Pages) List of Unclassifed Manufacturers – 24W Powered Device with Integrated DC-DC Controller

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