Kinetic Technologies
April 2019 – Revision 04a www.kinet-ic.com
1
FEATURES
The AS1114 is fully integrated and architected at a system
level to provide the following features:
⚫
Fully supports IEEE
®
Std. 802.3af-2003
⚫
Complies with IEC 61000-4-2/3/4/5/6 requirements
⚫
Complies with IEC 60950 over-voltage protection
requirements
⚫
Integrated rectification for superior high voltage
protection
⚫
Integrated DC-DC controller provides superior EMI
performance
⚫
Provides seamless support for local power
⚫
Over temperature protection
⚫
Industrial temperature range, -40ºC to +85ºC
⚫
5x5 mm, 20 pin QFN Package, RoHS compliant
TYPICAL APPLICATIONS
⚫
Voice over IP (VoIP) phones
⚫
Wireless LAN Access Points
⚫
Pan, Tilt and Zoom (PTZ), security and Web Cameras
⚫
Analog Telephone Adapters (ATA)
Point of Sale (PoS) Terminals
GENERAL DESCRIPTION
The AS1114 is a single-chip, highly integrated CMOS
solution for Power over Ethernet (PoE). It is identical to the
AS1113 except the switching frequency is reduced to
190kHz and the MPS feature is disabled. 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 AS1114 provides the functions required for power over
Ethernet Powered Device (PD) applications.
The AS1114 integrates rectification and protection circuitry,
a PD controller, and a DC-DC controller. This high level of
integration provides significant reliability and protection
advantages.
The AS1114 integrates rectification and protection circuitry,
a PD controller, and a DC-DC converter. This high level of
integration provides faster response 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.
AS1114 has been architected and designed to address
both EMI emission concerns and surge/over-voltage
protection in PoE applications. The device implements
many design features that minimizes transmission of
system common-mode noise on to the UTP cable.
By using high-volume standard CMOS technology, Akros
enables its customers to implement higher performance
PoE devices with low cost and a small footprint.
SIMPLIFIED APPLICATION DIAGRAM
AS1114
High Efficiency, 13W Integrated Powered Device and
DC-DC Controller
Signature
&
Classification
Thermal
Limit
Protection
Current
Limit/
Sense
UVLO
PD Controller
AS1114
DC-DC
Converter
with
Managed
Emissions
Control
RJ45
10/100/1000
PHy
Processor
GMII
Rectification
& Surge
Protection
AS1114
Kinetic Technologies
April 2019 – Revision 04a www.kinet-ic.com
2
TABLE OF CONTENTS
FEATURES .................................................................................................................................................................................. 1
TYPICAL APPLICATIONS ........................................................................................................................................................... 1
GENERAL DESCRIPTION ........................................................................................................................................................... 1
SIMPLIFIED APPLICATION DIAGRAM ....................................................................................................................................... 1
TABLE OF CONTENTS ............................................................................................................................................................... 2
FIGURES ..................................................................................................................................................................................... 3
TABLES ....................................................................................................................................................................................... 3
PIN ASSIGNMENTS AND DESCRIPTIONS ................................................................................................................................ 4
TYPICAL PERFORMANCE CHARACTERISTICS ................................ ....................................................................................... 8
FUNCTIONAL DESCRIPTION ................................................................................................................................................... 11
Overview of PoE .................................................................................................................................................................... 11
AS1114 PoE Design............................................................................................................................................................... 11
POWER FEED ALTERNATIVES FOR 10/100 ETHERNET SYSTEMS ..................................................................................... 12
AS1114 OVERVIEW .................................................................................................................................................................. 13
Rectification and Protection .................................................................................................................................................... 14
PD Controller .......................................................................................................................................................................... 14
Modes of Operation ................................ ................................................................................................................................ 14
Reset ...................................................................................................................................................................................... 14
Signature Detection Mode ...................................................................................................................................................... 14
Classification Mode ................................................................................................ ................................ ................................ 14
Idle Mode ............................................................................................................................................................................... 14
ON State ................................................................................................................................................................................ 14
Local Power Mode.................................................................................................................................................................. 15
PD CONTROLLER POWER AND THERMAL PROTECTION ................................................................................................... 15
Under Voltage Lockout (UVLO) .............................................................................................................................................. 15
Inrush Current Operation ........................................................................................................................................................ 15
Current Limit / Current Sense ................................................................................................................................................. 15
Thermal Limit / Protection ...................................................................................................................................................... 15
POE POWER-ON STARTUP WAVEFORM ............................................................................................................................... 16
DC-DC CONTROLLER .............................................................................................................................................................. 17
Overview ................................................................................................................................................................................ 17
Current-Limit/Current Sense .................................................................................................................................................. 17
Low Load Current Operation .................................................................................................................................................. 17
Compensation and Feedback ................................................................................................................................................ 17
Soft-Start Inrush Current Limit ................................................................................................................................................ 17
Auxiliary Power Option ........................................................................................................................................................... 17
DC-DC CONVERTER TOPOLOGIES ........................................................................................................................................ 18
Flyback vs. Forward Operation .............................................................................................................................................. 18
Buck Operation ...................................................................................................................................................................... 18
Primary Switching Topology ................................................................................................................................................... 18
APPLICATION CIRCUITS .......................................................................................................................................................... 18
BOARD LAYOUT CONSIDERATIONS ...................................................................................................................................... 20
PHYSICAL DIMENSIONS .......................................................................................................................................................... 21
IMPORTANT NOTICES ............................................................................................................................................................. 22
Legal notice ............................................................................................................................................................................ 22
Reference design policy ......................................................................................................................................................... 22
Life support policy .................................................................................................................................................................. 22
SUBSTANCE COMPLIANCE ................................................................................................................................................. 22