TPS23757中文资料具有反激式/正激式直流/直流控制器和 12V 至 57V 适配器支持的 3 级 PoE PD数据手册TI规格书

描述 Description

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.

特性 Features

• Powers up to 13 W (Input) PDs
• Optimized for Isolated DC/DC Converters
• Complete PoE Interface
• Programmable Frequency with Synch.
• Pin Compatible with TPS23754/6
• Industry Standard TSSOP-20