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。
LM3478
- 8-lead VSSOP-8 and SOIC-8 packages
- Internal push-pull driver with 1A peak current capability
- Current limit and thermal shutdown
- Frequency compensation optimized with a capacitor and a resistor
- Internal soft start
- Current mode operation
- Undervoltage lockout with hysteresis
- Key specifications:
- Wide supply voltage range of 2.97V to 40V
- 100kHz to 1MHz adjustable clock frequency
- ±2.5% (over temperature) internal reference
- 10µA shutdown current (over temperature)
- Create a custom design using the LM3478 with the WEBENCH Power Designer
The LM3478 is a versatile Low-Side N-Channel MOSFET controller for switching regulators. It is suitable for use in topologies requiring a low side MOSFET, such as boost, flyback, SEPIC, etc. Moreover, the LM3478 can be operated at extremely high switching frequency in order to reduce the overall solution size. The switching frequency of the LM3478 can be adjusted to any value between 100kHz and 1MHz by using a single external resistor. Current mode control provides superior bandwidth and transient response, besides cycle-by-cycle current limiting. Output current can be programmed with a single external resistor.
The LM3478 has built-in features such as thermal shutdown, short-circuit protection, over voltage protection, etc. Power saving shutdown mode reduces the total supply current to 5µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.
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 | LM3478 High-Efficiency Controller for Boost, SEPIC and Flyback DC-DC Converters datasheet (Rev. Y) | PDF | HTML | 2026/1/29 | ||
| Application brief | Avoiding Pulse Skip Operation at Light Load Conditions for Asynchronous Boost Converter Designs | PDF | HTML | 2025/9/16 | |||
| 應用說明 | AN-1286 Compensation for the LM3478 Boost Controller (Rev. D) | PDF | HTML | 2022/8/9 | |||
| 應用說明 | LM34xx How to Design Flyback Converter with LM3481 Boost Controller (Rev. A) | 2019/4/8 | ||||
| 選擇指南 | Power Management Guide 2018 (Rev. R) | 2018/6/25 | ||||
| 應用說明 | Softstart Using Constant Current Constant Voltage Approach | 2015/7/24 | ||||
| 技術文章 | Portable speaker power: Making the bass possible | PDF | HTML | 2015/5/12 | |||
| 應用說明 | Demystifying Type II and Type III Compensators Using Op-Amp and OTA for DC/DC Co | 2014/7/11 | ||||
| 應用說明 | AN-1484 Designing A SEPIC Converter (Rev. E) | 2013/4/23 | ||||
| 應用說明 | AN-1990 Compensation for Current Mode Control SEPIC Converters (Rev. A) | 2013/4/23 | ||||
| 應用說明 | Modeling & Design of Current Mode Control Boost Converters (Rev. B) | 2013/4/23 |
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)。
LM3478EVAL — 用於切換穩壓器的高效低側 N 通道控制器
High Efficiency Low-Side N-Channel Controller for Switching Regulator
LM3478 TINA-TI Boost and SEPIC Average Spice Model (Rev. A)
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。
LM3478-88-BOOST-CALC — LM3478-88 quick start calculator for boost
LM3478-88-FLYBACK-CALC — LM3478-88 quick start calculator for Flyback
LM3478-88-SEPIC-CALC — LM3478-88 quick start calculator for SEPIC
PMP10077 — 高電壓比率 Vout/Vin、2W 升壓轉換器參考設計
當輸出與輸入之間需要高電壓比時，選擇合適的拓撲結構總是很困難。在此案例中，出於成本考量，選擇最簡單的升壓。轉換器在 DCM 模式下運作，進而避免二極體的 Trr，並展現良好的效率。
TIDA-010046 — 配備 IEEE802.3at Type-1 (≤ 12.95 W) PoE-PD 且符合 EMC 規範的 10/100-Mbps 乙太網路 PHY 參考設計
此參考設計使用低功耗乙太網路實體層 (PHY) DP83825 最佳化爲 10 至 100 Mbps，支援超過 CAT5e 電纜的 150 公尺長範圍，超出了 100 公尺 (328 英尺) 的標準乙太網路距離限制。此設計包含乙太網路纜線供電，並使用 IEEE802.3at Type-1 (13 W) PoE-PD TPS23755 裝置進行數據通訊，而此裝置具有整合式一次側穩壓返馳 DC/DC 控制器。此參考設計預先符合輻射放射、ESD 及 EFT 的測試規範。
TIDA-01373 — EEPROM 編程工具參考設計
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| SOIC (D) | 8 | Ultra Librarian |
| VSSOP (DGK) | 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。