High Efficiency, 13W Integrated Powered Device and AS1114 DC-DC Controller FEATURES GENERAL DESCRIPTION The AS1114 is fully integrated and architected at a system The AS1114 is a single-chip, highly integrated CMOS level to provide the following features: solution for Power over Ethernet (PoE). It is identical to the AS1113 except the switching frequency is reduced to Fully supports IEEE Std. 802.3af-2003 190kHz and the MPS feature is disabled. Applications Complies with IEC 61000-4-2/3/4/5/6 requirements include Voice over IP (VoIP) Phones, Wireless LAN Access Point, Security and Web Cameras, Analog Telephone Complies with IEC 60950 over-voltage protection Adapters (ATA) and Point of Sales Terminals. requirements The AS1114 provides the functions required for power over Integrated rectification for superior high voltage Ethernet Powered Device (PD) applications. protection Integrated DC-DC controller provides superior EMI The AS1114 integrates rectification and protection circuitry, performance a PD controller, and a DC-DC controller. This high level of integration provides significant reliability and protection Provides seamless support for local power advantages. Over temperature protection The AS1114 integrates rectification and protection circuitry, Industrial temperature range, -40C to +85C a PD controller, and a DC-DC converter. This high level of 5x5 mm, 20 pin QFN Package, RoHS compliant 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 TYPICAL APPLICATIONS directly back to the earth ground, resulting in superior Voice over IP (VoIP) phones reliability and circuit protection. Wireless LAN Access Points AS1114 has been architected and designed to address both EMI emission concerns and surge/over-voltage Pan, Tilt and Zoom (PTZ), security and Web Cameras protection in PoE applications. The device implements Analog Telephone Adapters (ATA) many design features that minimizes transmission of Point of Sale (PoS) Terminals 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 10/100/1000 GMII Processor RJ45 PHy Rectification AS1114 & Surge Protection Current Signature DC-DC Limit/ & Converter Classification Sense with Managed Thermal Emissions UVLO Limit Control Protection PD Controller Kinetic Technologies August 2017 Revision 03h www.kinet-ic.com 1 AS1114 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 Kinetic Technologies August 2017 Revision 03h www.kinet-ic.com 2