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AS1124 Datasheet with Chat AI

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Part No.	AS1124
Manufacturer	ETC2
Size	1Mb
Pages	21 pages
Description	24W Powered Device with Integrated DC-DC Controller

Datasheet Summary with AI

1. Overview & Purpose

️· What it is: The AS1124 is a fully integrated Power over Ethernet (PoE) Power Device (PD) controller.
️· Purpose: It manages the power delivery process in PoE applications, ensuring compliance with standards and optimizing power efficiency.
️· Key Benefit: Reduces external component count, leading to a smaller footprint and lower costs.

2. Standards Compliance

️· IEEE 802.3af: Fully compliant with the IEEE 802.3af PoE standard.
️· Draft IEEE 802.3at: Supports functionality for the draft IEEE 802.3at standard (r0.9).
️· SELV Limits: Designed to operate within Safety Extra Low Voltage (SELV) limits (maximum 57V).
️· Testing: Passes rigorous testing including ESD, Contact Discharge, Air Discharge.

3. Functional Blocks & Operation

️· Rectification & Protection: Integrated diode bridge with over-voltage and transient protection. Designed for fast response to surge events.
️· PD Controller: Manages detection, classification, and full-power operation.
️· Operating Modes (Sequence):
- Reset: Initial state, very low power.
- Signature Detection: PSE reads the PD's signature (external resistor determines signature resistance – typically 26.7kΩ).
- Classification: PSE determines the power class of the PD by measuring load current (external resistor at RCLASS pin determines classification current).
- Idle: Wait state after classification.
- ON: Full power delivery.
️· Classification Classes & Power Levels:
- Class 5: Supports up to 24W

4. Key Features & Benefits

️· Integrated Protection: Reduces component count and improves response time for surge protection.
️· Programmable Features: Allows customization of signature resistance and classification current through external resistors.
️· EMI Compliance: Verified for CISPR 22, FCC Class B.
️· Power Feed Options: Compliant with both Alternative A and Alternative B power schemes in the 802.3af standard.
️· Fast Response: Designed to handle surge currents up to 30A.

5. Tables

️· Table 6: PoE Requirements (Maximum power, Voltage, Current, Resistance)
️· Table 7: Classification Classes and Power Levels