LM5026
- Current-Mode Control
- Internal 100-V Start-Up Bias Regulator
- 3-A Compound Main Gate Driver
- High Bandwidth Optocoupler Interface
- Programmable Line Undervoltage Lockout (UVLO)
With Adjustable Hysteresis - Versatile Dual Mode Overcurrent Protection With
Hiccup Delay Timer - Programmable Overlap or Deadtime between the
Main and Active Clamp Outputs - Programmable Maximum Duty Cycle Clamp
- Programmable Soft-Start
- Leading Edge Blanking
- Resistor Programmed 1-MHz Capable Oscillator
- Oscillator Sync I/O Capability
- Precision 5-V Reference
The LM5026 PWM controller contains all of the features necessary to implement power converters utilizing the active clamp and reset technique with current-mode control. With the active clamp technique, higher efficiencies and greater power densities can be realized compared to conventional catch winding or RDC clamp and reset techniques. Two control outputs are provided, the main power switch control (OUT_A) and the active clamp switch control (OUT_B). The device can be configured to control either a P-Channel or N-Channel clamp switch. The main gate driver features a compound configuration, consisting of both MOS and Bipolar devices, providing superior gate drive characteristics. The LM5026 can be configured to operate with bias voltages over a wide input range of 8 V to 100 V. Additional features include programmable maximum duty cycle, line undervoltage lockout, cycle-by-cycle current limit, hiccup mode fault operation with adjustable timeout delay, PWM slope compensation, soft-start, 1-MHz capable oscillator with synchronization input and output capability, precision reference, and thermal shutdown.
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 | LM5026 Active Clamp Current Mode PWM Controller datasheet (Rev. E) | PDF | HTML | 2015/11/30 | ||
| 選擇指南 | Power Management Guide 2018 (Rev. R) | 2018/6/25 | ||||
| 應用說明 | Operation and Benefits of Active-Clamp Forward Power Converters | 2007/3/22 |
設計與開發
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PMP11478 — 30W 主動鉗位順向式轉換器參考設計
PMP11478 是隔離式有源鉗位正向轉換器，可接受 24-36V 的電壓範圍，並提供 2.5A 的 12V 輸出。本設計使用 LM5026 有源鉗位電流模式控制器。使用 LMV431 分流穩壓器和光耦合器回饋來維持輸出電壓穩壓。肖特基整流器可利用輸出電容儲存的電荷達到 2.5ms 的保持時間。隔離電壓為 2250 VDC，符合基本絕緣要求。
PMP22075 — 具 9-V to 60-V 廣泛輸入範圍的高效 12-V、5-A 主動箝位順向參考設計
此順向轉換器參考設計專為隔離式 60-W、12-V 中間匯流排電壓軌而設計。可於 9 V 至 60 V 廣泛輸入範圍中運作。設計還配備 LM5026，一款 100-V 主動箝位電流模式 PWM 控制器。自我驅動的二次整流器，使用 UCC27511 4-A 和 8-A 驅動器以提高效率。可用於需要高效率和 hiccup 保護的隔離式電源應用。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WSON (NHQ) | 16 | Ultra Librarian |
| TSSOP (PW) | 16 | 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。