TPS23756
- Powers up to 30-W (Input) PDs
- DC-DC Control Optimized for Isolated Converters
- Supports High-Efficiency Topologies
- Complete PoE Interface
- Enhanced Classification per IEEE 802.3at With Status Flag
- Adapter ORing Support
- Programmable Frequency With Synchronization
- Robust 100-V, 0.5-Ω Hotswap MOSFET
- –40°C to 125°C Junction Temperature Range
- Industry Standard PowerPAD™ HTSSOP-20
The TPS23754 and TPS23756 devices have 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.
The TPS23754 and TPS23756 support a number of input voltage ORing options including highest voltage, external adapter preference, and PoE preference. These features allow the designer to determine which power source will carry the load under all conditions.
The PoE interface features the new extended hardware classification necessary for compatibility with high-power midspan power sourcing equipment (PSE) per IEEE 802.3at. 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 the design of active-clamp forward converters or optimized gate drive for highly-efficient flyback topologies. The second gate driver may be disabled if desired for single MOSFET topologies. The controller also features internal soft start, bootstrap start-up 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 TPS23754 device has a 15-V converter start-up while the TPS23756 device has a 9-V converter start-up. The TPS23754-1 replaces the PPD pin with a no-connect for increased pin spacing.
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 | TPS2375x IEEE 802.3at, High Efficiency, PoE Interface and DC-DC Controller datasheet (Rev. I) | PDF | HTML | 2017/12/19 | ||
| 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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TPS23756EVM — TPS23756EVM：用於 TPS23756 的評估模組
The TPS23756EVM contains evaluation and reference circuitry for the TPS23756, which is a Class 4 (25.5 W) PoE PD + PWM Controller. The TPS23756 is targeted at wide Vin aplications (12 V - 60 V) in isolated converter topologies and is compliant with the IEEE 802.3 at Power over Ethernet (PoE) (...)
SLUC480 — PoE PD Efficiency Calculator
PMP40514 — 適用於 PoE 電源的 3 類隔離高效率主動箝位返馳式轉換器參考設計
TIDA-00091 — 4 級 - 廣泛輸入範圍 15W 乙太網路供電 (PoE) 轉換器
附註：TIDA-00091 是使用 PMP6659 的硬體實作的。
4 類 – 寬輸入範圍、15W 乙太網路供電 (PoE) 轉換器參考設計可作為評估模組，供使用者為 IP 保全攝影機應用開發終端產品。 此參考設計已針對其寬輸入電壓範圍進行最佳化；可從轉接器輸入（10.8 至 57VDC 或 18 至 32VAC）或乙太網路供電，提供 12V、1.25A (15W) 的輸出功率。 寬輸入電壓範圍使此設計與使用 12 或 24VDC 或 24VAC 輔助電源的舊版應用相容。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| HTSSOP (PWP) | 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。