計算工具
TPS23785B
- Powers up to 30-W (Input) PDs
- DC-to-DC Control Optimized for Non-Isolated Converters
- Supports High-Efficiency Topologies
- Complete PoE Interface
- Enhanced Classification per IEEE 802.3at with Status Flag
- Adapter ORing Support
- Robust 100-V, 0.5-Ω Hotswap MOSFET
- –40°C to 125°C Junction Temperature Range
- Industry Standard PowerPAD TSSOP-24
The TPS23785B is a combined Power over Ethernet (PoE) powered device (PD) interface and current-mode DC-to-DC controller optimized specifically for non-isolated converters. The PoE interface supports the IEEE 802.3at standard.
The TPS23785B supports 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 two-event, physical-layer 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-to-DC controller features two complementary gate drivers with programmable dead time. This simplifies design for highly-efficient flyback topologies utilizing secondary synchronous rectification. The second gate driver may be disabled if desired for single MOSFET topologies. The controller also features internal softstart, bootstrap startup 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.
特別說明
主動 – 限制 TI 設計支援
此產品具有 TI 針對現有專案提供的有限直接設計支援。若有提供，您可在產品資料夾中找到相關資訊和軟體。對於使用此產品的現有設計，您可以在 TI E2E 支援論壇中要求支援，但此產品提供的支援有限。
技術文件
找不到結果。請清除您的搜尋條件，然後再試一次。
檢視所有 7 | 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | High-Power, High-Efficiency PoE PD and DC-to-DC Controller datasheet (Rev. A) | 2012年 12月 18日 | |
| Application note | Lightning Surge Considerations for PoE Powered Devices | 2015年 4月 30日 | ||
| User guide | TPS23785BEVM-522 Evaluation Module | 2014年 4月 25日 | ||
| Application note | Efficiency-Optimized, Synchronous Flyback, High-Power PoE Controller/Converter | 2012年 1月 17日 | ||
| Application note | High Efficiency Class 4 PoE Powered Device | 2011年 3月 23日 | ||
| Application note | Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) | 2009年 2月 9日 | ||
| Application note | Designing an EMI Compliant PoE with Isolated Flyback | 2008年 5月 20日 |
設計與開發
如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。
模擬工具
PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
參考設計
PMP8408 — 3 級 - 適用 PoE 應用的多輸出、高效率驅動式返馳式轉換器
This converter is used for Class 3 PoE applications where high efficiency and multiple outputs are required. The flyback converter with synchronous rectifier provides excellent efficiency and small size for PoE applications such as IP Phones. The TPS23785B contains both the PoE Powered Device (...)
參考設計
PMP8454 — 3 級 - 適用於 PoE 應用的多輸出、高效率自驅返馳式轉換器
This converter is used for Class 3 PoE applications where high efficiency and multiple outputs are required. PMP8454.1 has an output of 3.3V@2A. The flyback converter with synchronous rectifier provides excellent efficiency and small size for PoE applications such as a IP Phones. The TPS23785B (...)
Test report: PDF
參考設計
PMP8752 — 1 級 - 適用於 PoE 應用的多輸出、高效率返馳式轉換器參考設計
This converter is used for Class 1 PoE applications where high-efficiency and multiple-outputs are required. The multi-outputs for this design are 3.3V/0.7A, 5V/0.145A, 3.3V/1.5A. The flyback converter with synchronous rectifier provides excellent efficiency, and small size for PoE applications, (...)
參考設計
PMP8407 — 適用於 PoE 應用的第 2 級多重輸出、高效率返馳式轉換器
This reference evaluation module, featuring the TPS23785B PoE interface and DC-toDC contoller, is used for class 2 PoE applications where high effliency and multiple outputs are required.
The flyback converter with synchronous reftifier provides excellent efficiency and small size for PoE (...)
| 封裝 | 引腳 | 下載 |
|---|---|---|
| HTSSOP (PWP) | 24 | 檢視選項 |
訂購與品質
內含資訊：
- 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
- 資格摘要
- 進行中可靠性監測
內含資訊：
- 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。