TPS23757
- 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 Ω Hotswap MOSFET
- Pin Compatible with TPS23754/6
- –40°C to 125°C Junction Temperature Range
- Industry Standard TSSOP-20
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.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | High Efficiency PoE Interface and DC/DC Controller datasheet (Rev. D) | 2013/11/20 | |||
| 應用說明 | PoE Powered Devices Debug Guidelines | PDF | HTML | 2021/7/19 | |||
| 應用說明 | PoE PD Schematic Review Guidelines | PDF | HTML | 2021/4/29 | |||
| 選擇指南 | Power Management Guide 2018 (Rev. R) | 2018/6/25 | ||||
| 應用說明 | Lightning Surge Considerations for PoE Powered Devices | 2015/4/30 | ||||
| 應用說明 | Implementing a Buck Converter With the TPS23753A | 2010/9/20 | ||||
| 應用說明 | Using the TPS23753A with an External Error Amplifier | 2010/8/6 | ||||
| 應用說明 | Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) | 2009/2/9 | ||||
| 應用說明 | PoE Powered Device for 24 VAC Building Power Applications | 2008/9/10 | ||||
| 應用說明 | Designing an EMI Compliant PoE with Isolated Flyback | 2008/5/20 | ||||
| 應用說明 | Practical Guidelines EMI Compliant PoE | 2008/3/27 |
設計與開發
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TPS23757EVM — 適用於 TPS23757 的 22-57 Vin、5 Vout 高效 PoE 介面和 DC/DC 控制器評估模組
The TPS23757EVM contains evaluation and reference circuitry for the TPS23757. The TPS23757 contains a powered device (PD) and a power supply controller supporting many high-efficiency topologies. The TPS23757EVM supports the IEEE 802.3at (draft) standard for a type 1 PD (equivalent to the 13W (...)
SLUC480 — PoE PD Efficiency Calculator
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| TSSOP (PW) | 20 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。