TPS23730
- Complete IEEE 802.3bt Type 3 (Class 1-6) PoE PD Solution
- EA Gen 2 logo-ready (PoE 2 PD Controller)
- Robust 100-V, 0.3-Ω (typ) Hotswap MOSFET
- Supports power levels for up to 60-W operation
- Allocated power indicator outputs - parallel or serial encoding selectable
- Integrated PWM controller for flyback or Active Clamp
Forward configuration
- Flyback control with
primary-side regulation
- Supports CCM operation
- ±1.5% (typ, 5-V output) load regulation (0-100% load range) — with Sync FET
- Also supports secondary-side regulation
- Soft-start control with advanced startup and hiccup mode overload protection
- Soft-stop shutdown
- Adjustable frequency with synchronization
- Programmable frequency dithering for EMI
- Flyback control with
primary-side regulation
- Automatic Maintain Power Signature (MPS)
- Auto-adjust to PSE type and load current with auto-stretch
- Primary adapter priority input
- –40°C to 125°C junction temperature range
The TPS23730 device combines a Power over Ethernet (PoE) powered device (PD) interface, and a current-mode DC-DC controller optimized for flyback and active clamp forward (ACF) switching regulator designs . In the case of flyback configuration, the use of primary-side regulation (PSR) is supported. The PoE interface supports the IEEE 802.3bt standard for applications needing up to 51 W or less at PD input.
Programmable spread spectrum frequency dithering (SSFD) is provided to minimize the size and cost of EMI filter. Advanced Startup with adjustable soft-start helps to use minimal bias capacitor while simplifying converter startup and hiccup design, also ensuring that IEEE 802.3bt startup requirements are met.
The soft-stop feature minimizes stress on switching power FETs , allowing FET BOM cost reduction.
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 continuous conduction mode (CCM), and can work with secondary side synchronous rectification, resulting in optimum efficiency, regulation accuracy and step load response over multiple outputs.
The DC-DC controller features slope compensation and blanking. Typical switching frequency is 250 kHz.
The automatic MPS enables applications with low power modes or multiple power feeds. It automatically adjusts its pulsed current amplitude and duration according to PSE Type and system conditions, to maintain power while minimizing consumption.
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 | TPS23730 IEEE 802.3bt Type 3 PoE PD with High Efficiency DC-DC Controller datasheet (Rev. B) | PDF | HTML | 2020/11/25 | ||
| 應用說明 | PoE Powered Devices Layout Review Guide | PDF | HTML | 2021/8/27 | |||
| 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 choose your Type 3 (>51-W) PoE power topology | PDF | HTML | 2020/12/8 | |||
| 應用說明 | Soft-Stop: TPS2373X Feature Explanation | PDF | HTML | 2020/10/27 |
設計與開發
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TPS23730EVM-093 — 適用於 IEEE802.3bt Type 3 PoE PD 應用的 TPS23730 評估模組
PMP22477 — 具有輸入電源限制和 PSR 的 6 級 PoE PD 隔離式返馳轉換器 (12 V、3.8 A) 參考設計
此參考設計利用 12-V 與 3.8-A 輸出執行乙太網路供電 (PoE) 電源裝置 (PD) 返馳轉換器。TPS23730 PD 和 PWM 控制器提供所有必要功能，以執行返馳轉換器的 PoE PD 和 PWM 控制。TPS23730 採用一次側調節 (PSR)，免除對光耦合器回饋的需求。輸入電源限制電路可讓輸出並與第二個轉換器平行，以提升輸出功率能力。
PMP23253 — 6 級、PoE、PD、15-V、3.3-A 主動箝位順向轉換器參考設計
PMP23287 — 6 級、PoE、PD、24-V、2.5-A 主動箝位順向轉換器參考設計
PMP23365 — 具備外部熱插拔及遙測功能的 24V、3A 8 類 PoE PD 參考設計
此參考設計利用 24V 與 3A 輸出實作乙太網路供電 (PoE) 電源裝置 (PD) 主動箝位順向式轉換器。配備整合式脈衝寬度調變器 (PWM) 控制器的 TPS23730 PD 可提供所有必要功能，以實現主動箝位順向式轉換器的 PoE PD 與 PWM 控制。此設計使用二次側調節 (SSR) 和光耦合器回饋。增加外部熱插拔以實現 7 類與 8 類 PD 應用。一次側使用 INA237 來監控 DC/DC 輸入電壓和電流，電源資訊則會由 I2C 隔離器或光耦合器架構電路傳送至二次側。
TIDA-050045 — Type-3 IEEE802.3bt 就緒主動箝位順向轉換器 PoE 供電裝置參考設計
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VQFN (RMT) | 45 | 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。