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AS1851

GreenEdge™ IEEE802.3af/802.3at (13W-30W) PoE PD Controller with HV Isolation

Features Download Datasheet PDF

          • Digitally Isolated Programmable Power

          • PoE PD Controller

            • Type 1 and Type 2 IEEE® 802.3af & 802.3at Compliant PD (AS1851), Type 1 only (AS1831)
            • Automatic PoE-Plus (Type 2) detection in HW and I2C Modes (AS1851 only)
            • Low Resistance PD Power FET Switch (0.5Ω typical)
          • 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 Sync Power Outputs

            • Synchronous Controller with programmable power-FET timing for high efficiency at both light and full load
            • Programmable PWM Frequencies synched to External Clock
          • 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
            • External PWM sync clock option
            • Optional spread-spectrum clocking, SW controlled
            • 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 2120 VDC (1500 VRMS)
            • 100V Process for PoE transient voltage robustness

Applications

  • 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

Key Electrical Specifications

Vin(Min) Vin(Max) PoE PD Support Control  Topology Number of Output Rails High Voltage Isolation Package
9V 57V 802.3af&at HW, SW Mode I2C Flyback 1 Integrated QFN-9x9-64L-0.9

Typical Application Diagram

AS1851

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