LM5021
- Ultra Low Start-up Current (25 µA maximum)
- Current Mode Control
- Skip Cycle Mode for Low Standby Power
- Single Resistor Programmable Oscillator
- Synchronizable Oscillator
- Adjustable Soft-Start
- Integrated 0.7 A Peak Gate Driver
- Direct Opto-Coupler Interface
- Maximum Duty Cycle Limiting (80% for LM5021-1
or 50% for LM5021-2) - Slope Compensation (LM5021-1 Only)
- Under Voltage Lockout (UVLO) with Hysteresis
- Cycle-by-Cycle Over-Current Protection
- Hiccup Mode for Continuous Overload Protection
- Leading Edge Blanking of Current Sense Signal
- Packages: VSSOP-8 or PDIP-8
The LM5021 off-line pulse width modulation (PWM) controller contains all of the features needed to implement highly efficient off-line single-ended flyback and forward power converters using current-mode control. The LM5021 features include an ultra-low (25 µA) start-up current, which minimizes power losses in the high voltage start-up network. A skip cycle mode reduces power consumption with light loads for energy conserving applications (ENERGY STAR®, CECP, and so forth). Additional features include under-voltage lockout, cycle-by-cycle current limit, hiccup mode overload protection, slope compensation, soft-start and oscillator synchronization capability. This high performance 8-pin IC has total propagation delays less than 100 ns and a 1-MHz capable oscillator that is programmed with a single resistor.
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 | LM5021 AC-DC Current-Mode PWM Controller datasheet (Rev. E) | PDF | HTML | 2014/12/24 | ||
| 功能安全資訊 | LM5021 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | PDF | HTML | 2022/9/12 | |||
| 選擇指南 | Power Management Guide 2018 (Rev. R) | 2018/6/25 | ||||
| 技術文章 | Power Tips: Design considerations of high-voltage converters in a cascode MOSFET | PDF | HTML | 2015/11/3 | |||
| 應用說明 | AN-2102 LM3464 and LM5021 DHC 25W Reference Designs (Rev. A) | 2013/5/1 | ||||
| 使用指南 | Load Detecting Power Supply User Guide | 2012/1/27 |
設計與開發
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許多 TI 參考設計包含 LM5021
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| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VSSOP (DGK) | 8 | Ultra Librarian |
| PDIP (P) | 8 | Ultra Librarian |
訂購與品質
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