LM25017
- Wide 7.5-V to 48-V input range
- Integrated 650-mA high-side and low-side switches
- No schottky diode required
- Constant on-time control
- No loop compensation required
- Ultra-fast transient response
- Nearly constant operating frequency
- Intelligent peak current limit
- Adjustable output voltage from 1.225 V
- Precision 2% feedback reference
- Frequency adjustable to 1 MHz
- Adjustable undervoltage lockout (UVLO)
- Remote shutdown
- Thermal shutdown
- Create a custom design using the LM25017 with the WEBENCH power designer
The LM25017 device is a 48-V, 650-mA synchronous step-down regulator with integrated high-side and low-side MOSFETs. The constant on-time (COT) control scheme employed in the LM25017 device requires no loop compensation, provides excellent transient response, and enables very high step-down ratios. The on-time varies inversely with the input voltage resulting in nearly constant frequency over the input voltage range. A high voltage startup regulator provides bias power for internal operation of the IC and for integrated gate drivers.
A peak current limit circuit protects against overload conditions. The undervoltage lockout (UVLO) circuit allows the input undervoltage threshold and hysteresis to be independently programmed. Other protection features include thermal shutdown and bias supply undervoltage lockout (VCC UVLO).
The LM25017 device is available in WSON-8 and HSOP-8 plastic packages.
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 | LM25017 48-V, 650-mA Constant On-Time Synchronous Buck/Fly-Buck™ Regulator datasheet (Rev. F) | PDF | HTML | 2012/11/16 | ||
| Product overview | Isolated Power Topologies for PLC I/O Modules and Other Low-Power Applications (Rev. A) | PDF | HTML | 2024/8/20 | |||
| 選擇指南 | Buck Converter Quick Reference Guide (Rev. B) | 2021/4/8 | ||||
| 白皮書 | Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) | 2019/4/10 | ||||
| 應用說明 | Stability Analysis and Design of COT Type-3 Ripple Circuit | 2019/3/20 | ||||
| 技術文章 | Simplify your power storage design with these Fly-Buck™ power tips | PDF | HTML | 2017/9/13 | |||
| 技術文章 | Create a Fly-Buck™ converter in WEBENCH® Power Designer | PDF | HTML | 2015/10/9 | |||
| 類比設計期刊 | Fly-Buck(TM) converter provides EMC and isolation in PLC applications | 2015/1/29 | ||||
| 應用說明 | AN-2292 Designing an Isolated Buck (Fly-Buck) Converter (Rev. C) | 2014/12/17 | ||||
| Product overview | Fly-Buck™ Solution | 2013/11/19 | ||||
| 使用指南 | LM25017 Isolated Buck (FlyBuck) User's Guide | 2013/6/20 |
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)。
LM25017MR-EVM — LM25017 寬輸入電壓同步降壓穩壓器評估模組
LM25017MRFBEVM — LM25017MR 寬輸入電壓 3W 雙路輸出 Flybuck 穩壓器評估模組
本評估板採用 LM25017 恆定導通時間穩壓器，實作隔離式偏壓電源。 LM25017 穩壓器整合了建立隔離式降壓轉換器所需的高壓側與低壓側電源開關。
LM5017EVAL — LM5017 大範圍 VIN 同步降壓穩壓器評估板
The LM5017 evaluation board provides the design engineer with a fully functional buck regulator, employing the constant on-time (COT) operating principle. This evaluation board provides a 10V output over an input range of 12.5V to 100V.
LM5017ISOEVAL — LM5017 隔離偏壓電源評估板
An isolated bias supply is implemented in this evaluation board with LM5017 Constant-On-Time regulator. LM5017 regulator integrates both the high and low side power switches essential for creating isolated buck converter.
FLYBUCK-FLYBACK-DESIGN-CALC — Flybuck / Flyback Calculator
此工具協助電源供應工程師根據規格選擇正確的隔離式 DC-DC 拓撲結構。根據選擇的拓撲結構，計算機還會推薦適合設計的 IC。
TIDA-01160 — 適用於 UPS 和逆變器的精巧型單通道絕緣式 SiC 和 IGBT 閘極驅動器參考設計
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WSON (NGU) | 8 | Ultra Librarian |
| HSOIC (DDA) | 8 | 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。