TPS23755
- Complete IEEE 802.3at PD solution for type 1 PoE
- Ethernet Alliance (EA) logo certified designs available
- Robust 100-V, 0.36-Ω (typ) hotswap MOSFET
- Programmable classification level
- Integrated PWM controller with 0.77-Ω (typ) 150-V power MOSFET
- Flyback controller with PSR
- Supports CCM operation with secondary side diode rectifier
- ±3% (typ, 12-V Output) Load regulation (5%-100% range)
- Supports low-side switch buck topology
- Adjustable switching frequency with synchronization
- advanced startup
- Programmable slew rate and frequency dithering for enhanced EMI reduction
- Flyback controller with PSR
- Secondary side adapter priority control with smooth transition
- –40°C to 125°C Junction temperature range
- Small 6-mm x 4-mm VSON package
The TPS23755 device combines a Power over Ethernet (PoE) powered device (PD) interface, a 150-V switching power FET, and a current-mode DC-DC controller optimized for flyback topology. The high level of integration along with primary side regulation (PSR), spread spectrum frequency dithering (SSFD), and advanced startup makes the TPS23755 an ideal solution for size-constrained applications. The PoE implementation supports the IEEE 802.3at standard as a 13-W, Type 1 PD.
The PSR feature of the DC-DC controller uses feedback from an auxiliary winding for control of the output voltage, eliminating the need for external shunt regulator and optocoupler. It is optimized for operation with secondary side diode rectifier (typically 12-V output or higher). Typically, the converter operates in continuous conduction mode (CCM) at a switching frequency of 250 kHz.
SFFD and slew rate control helps to minimize the size and cost of the EMI filter. Advanced Startup allows the use of minimal bias capacitor while simplifying converter startup and hiccup design.
Secondary auxiliary power detect capability provides priority for a secondary side power adapter, while ensuring smooth transition to and from PoE input power, with no efficiency or thermal trade-off.
The DC-DC controller features internal soft-start, slope compensation, and blanking. For non-isolated applications, the buck topology is also supported by the TPS23755.
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 | TPS23755 IEEE 802.3at PoE PD with No-Opto Flyback DC-DC Controller datasheet (Rev. B) | PDF | HTML | 2020/11/25 | ||
| 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 | |||
| 技術文章 | How to reduce the size of your 13-W PoE PD solution | PDF | HTML | 2019/6/25 | |||
| 應用說明 | Lightning Surge Considerations for PoE Powered Devices | 2015/4/30 | ||||
| 應用說明 | Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) | 2009/2/9 | ||||
| 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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TPS23755EVM-894 — 適合 IEEE802.3at Type 1 PoE PD 應用的 TPS23755 評估模組
TIDA-010034 — IEEE802.3at Type-1 PoE 和 12V 適配器輸入到 IP 網路攝影機的負載點參考設計
TIDA-010046 — 配備 IEEE802.3at Type-1 (≤ 12.95 W) PoE-PD 且符合 EMC 規範的 10/100-Mbps 乙太網路 PHY 參考設計
此參考設計使用低功耗乙太網路實體層 (PHY) DP83825 最佳化爲 10 至 100 Mbps，支援超過 CAT5e 電纜的 150 公尺長範圍，超出了 100 公尺 (328 英尺) 的標準乙太網路距離限制。此設計包含乙太網路纜線供電，並使用 IEEE802.3at Type-1 (13 W) PoE-PD TPS23755 裝置進行數據通訊，而此裝置具有整合式一次側穩壓返馳 DC/DC 控制器。此參考設計預先符合輻射放射、ESD 及 EFT 的測試規範。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VSON (RJJ) | 23 | 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。