TPS23753

IEEE 802.3-2005 PoE 接口和隔离式转换控制器

The is a combined Power over Ethernet PoE powered device PD interface and current-mode dc/dc controller optimized specifically for isolated converter designs. The PoE implementation supports the IEEE 802.3at standard as a 13 W, type 1 PD. The requirements for an IEEE 802.3at type 1 device are a superset of IEEE 802.3-2008 originally 802.3af requirements.

The TPS23753 supports a number of input-voltage ORing options including highest voltage, external adapter preference, and PoE preference.

The PoE interface features an external detection signature pin that can also be used to disable the internal hotswap MOSFET. This allows the PoE function to be turned off. Classification can be programmed to any of the defined types with a single resistor.

The dc/dc controller features a bootstrap startup mechanism with an internal, switched current source. This provides the advantages of cycling overload fault protection without the constant power loss of a pull up resistor.

The programmable oscillator may be synchronized to a higher-frequency external timing reference.

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Optimized for Isolated Converters

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Complete PoE Interface

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Adapter ORing Support

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12 V Adapter Support

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Programmable Frequency with Synch.

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Robust 100 V, 0.7 Hotswap MOSFET

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Small TSSOP 14 Package

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15 kV / 8 kV System Level ESD Capable

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–40°C to 125°C Junction Temperature Range

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Design Procedure Application Note - SLVA305

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Adapter ORing Application Note - SLVA306

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APPLICA ONS

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IEEE 802.3at Compliant Powered Devices

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VoIP Telephones

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Access Points

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Security Cameras