AS1135 Datasheet, PDF (1/2 Pages) List of Unclassifed Manufacturers – Powered Device with Integrated DC-DC Controller

Product Brief
General Description
The AS1135 is a single-chip, highly integrated CMOS solution
for Power over Ethernet (PoE) Powered Devices requiring input
power of up to 30Watts. Applications include Voice over IP
(VoIP) Phones, Wireless LAN Access Point, Security Cameras,
WiMax Terminals, Point of Sales Terminals, RFID Readers,
Thin Clients and Notebook computers.
The AS1135 integrates input Surge Protection, a PD controller,
and a low-emission DC-DC controller. The AS1135 implements
all the physical layer Powered Device (PD) functionality as
required by the IEEE® 802.3af-2005 and IEEE® 802.3at (Draft
2.0) standards. This includes 2-event classification, Type2 PSE
detection indicator (ATDET) in addition to PD detection, under-
voltage lockout, and hot-swap FET integration.
The AS1135 has been architected and designed to address
both EMI emission concerns and surge/over-voltage protection
in POE applications. The AS1135 implements many design
features that minimizes transmission of system common-mode
noise on to the UTP. On-chip integration of surge protection
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.
By using high-volume standard CMOS technology, Akros
enables its customers to implement higher performance PoE
devices with low cost and a small footprint.
Example Application Diagram
AS1135
13-30W IEEE 802.3af/at (Draft 2.0)
Powered Device with Integrated
DC-DC Controller
Features
The AS1135 is fully integrated and architected at a system level
to provide the following features:
• Fully supports IEEE® Std. 802.3af-2005 and supports
IEEE® Std. 802.3at (Draft 2.0) power requirements
• Supports 2-Event Physical Layer Classification for
802.3at (Draft 2.0) higher power PD applications
• Provides Type 2 PSE detection per 802.3at (Draft 2.0)
• Meets IEC 61000-4-2/3/4/5/6 for EMC Compliance
• Meets IEC 60950 isolation requirements
• Integrated DC-DC controller, provides exceptional
EMI performance
• Programmable DC current limit up to 800mA
• Provides seamless support for local power 10~57V
• Low Rds-on hot-swap FET (typical 0.8Ω)
• Over temperature protection
• Industrial temperature range, -40ºC to +85ºC
• 5x5 mm, 20 lead QFN Package, RoHS compliant
Typical Applications
• Pan, Tilt and Zoom (PTZ), Security and Web Cameras
• Voice over IP (VoIP) phones
• Wireless LAN Access Points, WiMax Terminals
• Point of Sale (PoS)Terminals, RFID Terminals
• Thin Clients and Notebook Computers
• Fiber to the Home (FTTH) Terminals
Figure 1: Typical Application Diagram for PoE PD (Flyback converter)
AS1135 Product Brief
March 2008
Page 1