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AS1138 PDF Datasheet浏览和下载

型号.:
AS1138
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内容描述:
[single-chip, highly integrated CMOS solution]
文件大小:
929 K
文件页数:
28 Pages
品牌Logo:
品牌名称:
AKM [ ASAHI KASEI MICROSYSTEMS ]
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AS1138
GENERAL DESCRIPTION
The AS1138 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 AS1138 integrates input surge protection, a PD controller
and a low-emission DC-DC controller. The AS1138 implements
all of the physical layer Powered Device (PD) functionality, as
required by IEEE® 802.3af-2005 and IEEE® 802.3at-2009
standards. This includes 2-event classification, Type 2 PSE
detection indicator (ATDET), PD detection, under-voltage lock
out (UVLO), and Hot-Swap FET integration.
The AS1138 has been architected to address both EM emission
concerns and surge/over-voltage protection in PoE applications.
The chip implements many design features that minimize
transmission of system common-mode noise onto the
Unshielded Twisted Pair (UTP). On-chip integration of surge
protection provides faster response to surge events and limits
stray surge current from passing through sensitive circuits, such
as the Ethernet PHY. The device is designed to provide safe,
low-impedance discharge paths directly 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.
DATASHEET
FEATURES
The AS1138 is fully integrated and architected at a system level
to provide the following features and compliance:
Full support of both IEEE® Std. 802.3af-2005 and
IEEE® Std. 802.3at-2009 power requirements
“2-Event” classification for 802.3at higher power PDs
Robust Type 2 PSE detector with proprietary digital
filtering for line noise to eliminate false positives
IEC 61000-4-2/3/4/5/6 requirements for EMC
Compliance
Integrated Surge Protection for 15kV/8kV System
level ESD Compliance
Integrated DC-DC controller for exceptional EMI
performance
Programmable DC current limit up to 720mA for 30W
applications
Seamless support for local power, down to 9.5V
Implemented in robust 100V automotive process
Low Rds-on Hot-Swap FET (typical 0.8Ω)
Integrated Short-Circuit Protection
Over temperature protection
Industrial temperature range, -40º 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) terminal
Figure 1 - Typical PoE PD Application (Flyback Converter)
RJ45
10/100/1K
PHY
GMII
Processor
Local
Power
Surge
Protection
AS1138
Local
Adapter
Control
DC-DC
Controller
With
Managed
Emissions
Control
LVMODE
Signature
Extended
Classification
& MPS
Current
Limit /
Sense
UVLO
Thermal
Limit
Protection
AT
Detection
ATDET
PD Controller
Version 1.4
1