現在提供此產品的更新版本
功能相同，但針腳輸出與所比較的裝置不同。
LM25117-Q1
- LM25117-Q1 is Qualified for Automotive Applications
- AEC-Q100
Qualified With the Following Results:
- Device Temperature Grade 1: -40°C to 125°C Ambient Operating Temperature Range
- Emulated Peak Current Mode Control
- Wide Operating Range from 4.5 V to 42 V
- Robust 3.3 A Peak Gate Drives
- Adaptive Dead-time Output Driver Control
- Free-run or Synchronizable Clock up to 750 kHz
- Optional Diode Emulation Mode
- Programmable Output from 0.8 V
- Precision 1.5% Voltage Reference
- Analog Current Monitor
- Programmable Current Limit
- Hiccup Mode Over Current Protection
- Programmable Soft-start and Tracking
- Programmable Line Undervoltage Lockout
- Programmable Switch-over to External Bias Supply
- Thermal Shutdown
The LM25117 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.
The operating frequency is programmable from 50 kHz to 750 kHz. The LM25117 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator that allows external bias supply further improves efficiency. The LM25117’s unique analog telemetry feature provides average output current information. Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.
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 | LM25117/Q1 Wide Input Range Synchronous Buck Controller With Analog Current Monitor datasheet (Rev. F) | PDF | HTML | 2015/8/27 | ||
| 白皮書 | Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) | 2019/4/10 | ||||
| 白皮書 | Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) | 2018/7/3 | ||||
| 類比設計期刊 | Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics | 2016/7/21 |
設計與開發
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LM25117EVAL — LM25117 寬輸入電壓同步降壓控制器評估板
The LM25117 evaluation board provides the design engineer with a fully functional synchronous buck converter based on Emulated Current Mode Control to evaluate the LM25117 controller IC. The evaluation board provides 3.3V output with a 9A current capability in addition with average output current (...)
LM25117-5117QUICK-CALC — LM(2)5117 快速入門計算機
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| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WQFN (RTW) | 24 | Ultra Librarian |
| HTSSOP (PWP) | 20 | 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。