TPS23731
- Complete IEEE 802.3bt Type 3 (Class 1-4) and 802.3at 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 30-W operation
- Integrated PWM controller for flyback 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
- ±3% (typ, 12-V output) load regulation (5-100% load range) — diode rectified
- 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 TPS23731 device combines a Power over Ethernet (PoE) powered device (PD) interface, and a current-mode DC-DC controller optimized for flyback switching regulator designs where the use of primary-side regulation (PSR) is supported. The PoE interface supports the IEEE 802.3bt and IEEE 802.3at standard s for applications needing up to 25.5 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 /at startup requirements are met.
The soft-stop feature minimizes stress on switching sync FET(s), 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
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | TPS23731 IEEE 802.3bt Type 3 Class 1-4 PoE PD with No-Opto Flyback DC-DC Controller datasheet | PDF | HTML | 2020年 10月 2日 |
| EVM User's guide | TPS23731EVM-095 Evaluation Module (Rev. A) | PDF | HTML | 2023年 8月 2日 | |
| Application note | PoE Powered Devices Debug Guidelines | PDF | HTML | 2021年 7月 19日 | |
| Application note | PoE PD Schematic Review Guidelines | PDF | HTML | 2021年 4月 29日 | |
| Certificate | TPS23731EVM-095 EU RoHs Declaration of Conformity (DoC) | 2020年 11月 13日 | ||
| Application note | Soft-Stop: TPS2373X Feature Explanation | PDF | HTML | 2020年 10月 27日 |
設計與開發
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TPS23731EVM-095 — TPS23731 IEEE802.3bt 3 型 4 類 PoE PD 應用評估模組
The TPS23731 evaluation module (TPS23731EVM-095) contains evaluation and reference circuitry for the TPS23731, which is a IEEE802.3bt Type 3 Class 4 PoE PD controller suitable for Class 4 (25.5W) PoE PD applications.
PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
| 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
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點
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。