GreenEdge™ IEEE802.3af PoE PD Controller with HV Isolation, Quad DC-DC Outputs with I2C based Management & Diagnostics
The AS1834 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 high-voltage isolation and quad-output digital power DC-DC converters – resulting in a complete PoE & Power management solution in a single device with minimal external components.
In addition to enabling digital PoE power conversion, Akros GreenEdge™ isolation enables direct digital management of isolated Primary GPIO for real time Green Power application capabilities. The device includes a standard I2C based uController interface for advance programmability, monitoring, alarms, diagnostics and management support. The AS1834 is available in a 64-pin 9x9 QFN, Reduction of Hazardous Substance (RoHS)-compliant package.
Applications
The AS1834 is geared towards use in lower cost sytems that will greatly benefit from the GreenEdge Technology performane, integration, and feature enablement; and can enhance product features and benefits with 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
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
- Outputs #2 & #3: Fully integrated Buck Regulators w/2A FETs
- Output #4: DC-DC Controller for Buck, Boost, or LED Driver
Power Management
- Hardware programmable start-up power sequencing
- Primary-side power monitoring & control from Secondary side
- Individual output Power-Good management
- Voltage margining for each output
- Primary GPIO/ADC controlled via Secondary GPIO or I2C
- 5V µC-compatible with interrupt on alarm services
- Programmable watchdog timer
EMC Compliance and Protection
- Slew-rate-controlled power drivers
- Multi-phased PWM clocking, with External Sync clock option
- Optional spread-spectrum clocking available for all PWMs
- 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
Block Diagram
[1]
Documentation
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