13W Powered Device with Integrated DC-DC Controller AS1113 and MPS Function FEATURES GENERAL DESCRIPTION The AS1113 is fully integrated and architected at a system The AS1113 is a single-chip, highly integrated CMOS level to provide the following features: solution for Power over Ethernet (PoE). Applications include Voice over IP (VoIP) Phones, Wireless LAN Access Fully supports IEEE Std. 802.3af-2003 Point, Security and Web Cameras, Analog Telephone Complies with IEC 61000-4-2/3/4/5/6 requirements Adapters (ATA) and Point of Sales Terminals. Complies with IEC 60950 over-voltage protection The AS1113 provides the functions required for power over requirements Ethernet Powered Device (PD) applications. Integrated rectification for superior high voltage The AS1113 integrates rectification and protection circuitry, protection a PD controller, and a DC-DC controller. This high level of Integrated DC-DC controller provides superior EMI integration provides significant reliability and protection performance advantages. Provides seamless support for local power The AS1113 integrates rectification and protection circuitry, a PD controller, and a DC-DC converter. This high level of Maintains power signature under light load conditions integration provides faster response to surge events and Over temperature protection limits stray surge current from passing through sensitive Industrial temperature range, -40C to +85C circuits, such as the Ethernet PHY device. The device is designed to provide a safe low impedance discharge paths 5x5 mm, 20 pin QFN Package, RoHS compliant directly back to the earth ground, resulting in superior reliability and circuit protection. TYPICAL APPLICATIONS AS1113 has been architected and designed to address both EMI emission concerns and surge/over-voltage Voice over IP (VoIP) phones protection in PoE applications. The device implements many design features that minimizes transmission of Wireless LAN Access Points system common-mode noise on to the UTP cable. Pan, Tilt and Zoom (PTZ), security and Web Cameras By using high-volume standard CMOS technology, Akros Analog Telephone Adapters (ATA) enables its customers to implement higher performance Point of Sale (PoS) Terminals PoE devices with low cost and a small footprint. SIMPLIFIED APPLICATION DIAGRAM 10/100/1000 GMII Processor RJ45 PHy AS1113 Rectification & Surge Protection Current DC-DC Signature and MPS Limit/ Converter Sense with Managed Thermal Emissions UVLO Limit Control Protection PD Controller Kinetic Technologies September 2017 Revision 03k www.kinet-ic.com 1 AS1113 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 AS1113 PoE Design............................................................................................................................................................... 11 POWER FEED ALTERNATIVES FOR 10/100 ETHERNET SYSTEMS ..................................................................................... 12 AS1113 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 MAINTAIN POWER SIGNATURE (MPS) ................................................................................................................................... 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 September 2017 Revision 03k www.kinet-ic.com 2