TPS23734
- 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 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
- ±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 TPS23734 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 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 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 | TPS23734 IEEE 802.3bt Type 3 Class 1-4 PoE PD with High Efficiency DC-DC Controller datasheet (Rev. A) | PDF | HTML | 2020/9/21 | ||
| 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 | |||
| 應用說明 | Soft-Stop: TPS2373X Feature Explanation | PDF | HTML | 2020/10/27 | |||
| 證書 | TPS23734EVM-094 EU Declaration of Conformity (DoC) | 2020/5/29 |
設計與開發
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TPS23734EVM-094 — TPS23734 IEEE802.3bt 3 型 4 類 PoE PD 應用評估模組
PMP23278 — 4 級、PoE PD、12-V、2.1-A 主動箝位順向轉換器參考設計
PMP23366 — 具有平順轉換和遙測功能的雙輸入備援 PoE Class 6 PD 參考設計
此設計實作乙太網路供電 (PoE) 第 6 類供電產品 (PD)，搭載雙備援 PoE 輸入，可在這些輸入與輔助輸入間順暢轉換。使用兩個 TPS2372-3 PD 控制器進行高達 51W 的高功率 PoE 控制。5V 9A 主動箝位順向式轉換器隨 TPS23734 IC 的 PWM 部分實作。INA237A 透過 I2C 提供輸入電壓/電流/功率/溫度量測。
| 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。