The TPS23757 is a combined Power over Ethernet (PoE) powered device (PD) interface and current-mode dc/dc controller optimized specifically for isolated converters. The PoE interface supports the IEEE 802.3at standard for a type 1 PD, which is equivalent to the 13W standard of IEEE 802.3-2008.

The TPS23757 supports a number of input voltage ORing options including highest voltage, external adapter preference, and PoE preference.

The TPS23757 has an output flag indicating if an external wall adapter is active when used in conjunction with ORing controls. The detection signature pin can also be used to force power from the PoE source off. Classification can be programmed to any of the defined types with a single resistor.

The dc/dc controller features two complementary gate drivers with programmable dead time. This simplifies design of highly-efficient flyback topologies or active-clamp forward or flyback converters. The second gate driver may be disabled if desired for single MOSFET topologies. The controller also features internal softstart, bootstrap startup source, current-mode compensation, and a 78% maximum duty cycle. A programmable and synchronizable oscillator allows design optimization for efficiency and eases use of the controller to upgrade existing power supply designs. Accurate programmable blanking, with a default period, simplifies the usual current- sense filter design trade-offs.

The TPS23757 has a 9 V converter startup, permitting operation with 12 V wall adapters.

• Powers up to 13 W (Input) PDs
• Legacy and IEEE 802.3at Type 1 PDs
• Optimized for Isolated DC/DC Converters
• Supports High-Efficiency Topologies
• Complete PoE Interface
• Adapter ORing Support
• Programmable Frequency with Synch.
• Robust 100 V, 0.5 ? Hotswap MOSFET
• Pin Compatible with TPS23754/6
• –40°C to 125°C Junction Temperature Range
• Industry Standard TSSOP-20

• Vin (Min) (V)
• 9.3
• Vin (Max) (V)
• 57
• PoE current limit (Min) (mA)
• 400
• PoE inrush limit (Typ) (mA)
• 140
• rDS(on) per FET (Typ) (mOhms)
• 430
• PoE standards supported
• 802.3at Type 1 (802.3af)
• PD power level
• 13W
• DC/DC control
• PD and DC/DC
• Fault response
• Auto Retry
• Features
• Primary Side Adapter Priority, Second Gate Drive, Thermal Shutdown
• Switching frequency
• Programmable, Synchronizable

TPS23757的完整型号有：TPS23757PW、TPS23757PWR，以下是这些产品的关键参数及官网采购报价：

TPS23757PW，工作温度：-40 to 125，封装：TSSOP (PW)-20，包装数量MPQ：70个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TPS23757PW的批量USD价格：1.742（1000+）

TPS23757PWR，工作温度：-40 to 125，封装：TSSOP (PW)-20，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TPS23757PWR的批量USD价格：1.452（1000+）

TPS23757EVM — TPS23757 22-57V 输出电压、5V 输出电压高效 PoE 接口和 DC/DC 控制器评估模块

TPS23757EVM 包含 TPS23757 的评估和参考电路。TPS23757 包含有源器件 (PD) 和电源控制器，支持多种高效拓扑。TPS23757EVM 支持 1 类 PD 的 IEEE 802.3at 标准（草案）（相当于 IEEE 802.3-2008 的 13W 标准），并且包含针对高效转换器拓扑进行优化的电源控制器。TPS23757EVM 面向 11W 同步反向转换器应用。

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