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PDF AS1138 Data sheet ( Hoja de datos )
| Número de pieza | AS1138 | |
| Descripción | 30W PoE PD and DC-DC Controller | |
| Fabricantes | Akros Silicon | |
| Logotipo |  |
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AS1138 — 30W PoE PD and DC-DC Controller
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.
FEATURES
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) terminals
SIMPLIFIED APPLICATION DIAGRAM
Akros Silicon, Inc.
6399 San Ignacio Avenue, Suite 250, San Jose, CA 95119 USA
408.746.9000 www.AkrosSilicon.com
1 page  
AS1138
Table 2 - Absolute Maximum Ratings
Description
High-voltage pins (4—VDD48I; 2—VDD48O) under
Transient conditions4
High-voltage pins (4—VDD48I; 2—VDD48O)
Steady-state with internal Surge Clamp
Low-voltage pins (8—VDD5; 9-RCURR; 10—
RCLASS; 11—LVMODE; 12—FB; 13—COMP;
14—CSS; 15—CS; 16—NDRV; 17—VBN; 18—
FSEL; 19—ATDET)
Human body model2
ESD charged device model
ESD machine model
System level (contact/air) at RJ-453
Temperature
Storage temperature
Junction temperature
Max Value1
100
80
6
ESD Ratings
2
500
200
8/15
165
150
Units
Volts
Volts
Volts
kV
V
V
kV
°C
°C
1 Absolute maximum ratings are limits beyond which damage to the device may occur.
2 The human body model is as described in JESD22-A114.
3 System ESD testing done per IEC61000-4-2.
4 Transient conditions like system startup and other noise conditions. Device must not be exposed to sustained over-voltage condition at this
level. See section on Rectification and Protection for further details on Integrated Surge Protection.
Table 3 - Normal Operating Conditions
Unless otherwise noted, specifications are for Vin = 48V.
Description
Min
VIN-AF (Type 1 PD)
VIN-AT (Type 2 PD)
Operating temperature range,
37V
42.5V
-40ºC
Typical1
48V
48V
Max
57V
57V
+85°C
1 Typical specification; not 100% tested. Performance guaranteed by design and/or other correlation methods.
Akros Silicon, Inc.
6399 San Ignacio Avenue, Suite 250, San Jose, CA 95119 USA
408.746.9000 www.AkrosSilicon.com
5
5 Page 
AS1138
Figure 14 - PI Input Voltage and Current / ATDET
Figure 15 - 3.3V 30W DC-DC Efficiency vs. Load
Figure 16 - 3.3V 30W End-End Efficiency vs. Load
Akros Silicon, Inc.
6399 San Ignacio Avenue, Suite 250, San Jose, CA 95119 USA
408.746.9000 www.AkrosSilicon.com
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS1138.PDF ] | |
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