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PMP411 以太网电源 - 同步反向参考设计

	PMP411
名称	Power Over Ethernet - Sync Flyback Reference Design
状态	ACTIVE
价格（US$）

PMP411 描述

This reference design describes an easy-to-use, low cost isolated power supply to be used in Power-over-Ethernet Powered Devices (PD's). Power-over-Ethernet is an emerging new capability to deliver data and power to internet appliances over existing CAT-5 Ethernet cables. Power-over-Ethernet is rapidly gaining in popularity with manufacturers and users of devices such as VoIP phones, wireless access points, security cameras and point-of-sale terminals. The TPS2370 is a PoE Interface Switch used to control the input power in accordance with the IEEE802.3af governing standard. The UCC3809 is a current-mode PWM controller for a continuous mode synchronous flyback regulator. Depending on load current, the synchronous rectifier achieves 5-15% better efficiency than a schottky rectifier. The main output is 3.3V at 3.1A. A second winding is added to the transformer to create a semi-regulated 5.5V output. A TPS76850 LDO is used to provide tighter regulation for output currents up to 1A. An adjustable 12-24V at 20mA LCD bias voltage is generated from the 3.3V output with a TPS61045 Boost Converter. All control circuitry and the power switch are internal to the IC. The only external parts required are an inductor, rectifier, input/output capacitors, and feedback resistors. Bias voltage for the DSP core is generated from the 3.3V output with a TPS62201 synchronous buck controller. All control circuitry and both power switches are internal to the IC. The only external parts required are an inductor and input/output capacitors. This converter will deliver 1.5V at up to 300mA

PMP411 应用技术支持与电子电路设计开发资源下载

1. TI 德州仪器非隔离式开关 DC/DC 调节器选型与价格参考 . xls

PMP411 相关产品

器件型号	名称	产品系列
TPS61045	采用 QFN-8 封装的 28V 85% 效率的升压转换器，用于 LCD 应用领域	照明解决方案
TPS62004	采用 MSOP-10 封装的 1.5V 600mA 输出、95% 高效步降转换器	DC/DC 转换器（集成开关）
UCC3809-1	经济型初级侧控制器	AC/DC 和 DC/DC 电源
UCC3809-2	经济型初级侧控制器	AC/DC 和 DC/DC 电源