AS1822

 

GreenEdge™ IEEE802.3af PoE PD Controller with HV Isolation and Dual DC-DC outputs

The AS1822 integrates Akros GreenEdge™ Isolation technology with next generation Power-over-Ethernet (PoE) PD and power conversion technology to deliver groundbreaking power integration, and enable a new range of Digital Power PoE PD capabilities and solutions.      

A Type 1 (IEEE® 802.3af) compliant PD is integrated with 2kV high-voltage isolation and dual-output digital power DC-DC converters – resulting in a complete PoE & Power management solution in a single device with minimal external components. 
 
The AS1822 features Akros GreenEdgeTM technology that delivers integrated synchronous rectification with superior light-load to full-load power conversion efficiency, enabling a new generation of energy efficient designs. The device also features bidirectional Isolated GPIO, an input for external synchronization of all PWM clocks, and a Watchdog timer – enabling implementation of intelligent energy saving solutions.

Applications

The AS1822 is geared towards use in lower cost sytems that will greatly benefit from the GreenEdge Technology performane, integration, and feature enablement, without the need for advanced software programmability, monitoring and diagnostic features.

  • Voice-over-IP (VoIP) phones
  • Wireless LAN & WiMAX access points (WAP)
  • Pan, Tilt, Zoom (PTZ) Cameras, IP cameras
  • Thin-client and notebook computers
  • Fiber-to-the-home (FTTH) terminals
  • Point-of-sale (PoS) terminals, RFID readers

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Features

Digitally Isolated Programmable Power

   PoE PD Controller

  • Type 1 IEEE® 802.3af Compliant PD

   Primary-Side DC-DC Controller

  • High-efficiency DC-DC Controller with Digital Optimization
  • Primary-Secondary High-voltage integrated Digital Isolation
  • Programmable Primary Clock Frequency
  • Local-power operation down to 9.5V

  Secondary-Side Power Outputs

  • Programmable PWM Frequencies synched to External Clock
  • Output #1: Sync Controller with programmable power-FET timing for high efficiency at both light and full load
  • Output #2: DC-DC Controller for Buck, Boost, or LED Driver with PWM/Analog dimming control

 Power Management

  • Hardware programmable start-up power sequencing
  • Power-Good management
  • Programmable Watchdog timer to manage system resets
  • Bidirectional Primary-to-Secondary Isolated GPIO pair for intelligent energy management

EMC Compliance and Protection

  • External clock input to synchronize all PWM's (primary & secondary) for EMC management
  • Slew-rate-controlled power drivers
  • Multi-phased PWM clocking, with External Sync clock option
  • Over-current, Under/Over-voltage and Short-circuit Protection
  • High-temperature warning and shutdown
  • Meets IEC 61000-4-2/3/4/5/6, IEC60747, IEC 60950, DIN EN60747-5-2 (VDE0884), & UL1577 requirements for EMC compliance and basic isolation to 1500 VRMS

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Block Diagram