LM25185
- Functional Safety-Capable
- 4.5-V to 42-V wide input voltage range
- Extended power range from less than 1 W to more than 50 W
- Robust PSR flyback design for
reliable and rugged applications
- Robust design with only a transformer crossing the isolation barrier
- ±1.5% total output regulation accuracy
- Optional VOUT temperature compensation
- Input UVLO and thermal shutdown protection
- Hiccup-mode overcurrent fault protection
- 0.9-mm HV-LV pin spacing in 14-pin HTSSOP package
- –40°C to +150°C junction temperature range
- Integration reduces design size
and cost
- No optocoupler or transformer auxiliary winding required for V OUT regulation
- 2-A peak sink and 1-A peak source high-current power MOSFET gate driver
- High efficiency with
best-in-class active I Q
- Quasi-resonant switching in boundary conduction mode (BCM) at heavy load
- External VCC option for improved efficiency
- High light-load efficiency with lowest I Q (25-µA typical with external VCC)
- Single and multiple output implementations
- Ultra-low conducted and radiated EMI signatures
- Soft switching avoids diode reverse recovery
- Designed for CISPR 32 EMI requirement
- Create a custom design using LM25185 with WEBENCH Power Designer
The LM25185 is a primary-side regulated (PSR) flyback controller with high efficiency over a wide input voltage range of 4.5 V to 42 V. The isolated output voltage is sampled from the primary-side flyback voltage, eliminating the need for an optocoupler, voltage reference, or third winding from the transformer for output voltage regulation.
The high level of integration results in a simple, reliable, and high-density design with only a transformer crossing the isolation barrier. Boundary conduction mode (BCM) switching enables a compact magnetic design and better than ±1.5% load and line regulation performance. BCM supports applications of up to 42-V input with enhanced headroom for line transients.
The LM25185 flyback controller simplifies implementation of isolated DC/DC supplies with optional features to optimize performance for the target end equipment. The output voltage is set by one resistor, while an optional resistor improves output voltage accuracy by negating the thermal coefficient of the flyback diode voltage drop. The LM25185 controller, with the integrated high-current MOSFET gate driver, extends the power range from less than 1 W to more than 50 W, making the device a scalable and easy-to-migrate design over a wide power range. The tunable compensation using the COMP pin and the adjustable peak current limit with the current-sensing resistor make the design flexible and an excellent choice towards different application requirements.
Additional features include an internally-fixed or externally-programmable soft start, optional external VCC for higher efficiency, precision enable input with hysteresis for adjustable line UVLO, peak current-mode control with shunt current sensing, hiccup-mode overload protection, a high-current MOSFET gate driver, and thermal shutdown protection with automatic recovery. A connection to the high-voltage MOSFET drain is not required, thus increasing safety and simplifying PCB clearance distance requirements.
The LM25185 flyback controller is available in a 14-pin, 5-mm × 4.4-mm, thermally-enhanced HTSSOP package with 0.65-mm pin pitch.
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 | LM2518542-VINPSR Flyback DC/DC Controller With Low IQand Low EMI datasheet | PDF | HTML | 2023/11/10 | ||
| 功能安全資訊 | LMx5185 Functional Safety FIT Rate, FMD and Pin FMA | PDF | HTML | 2023/5/24 |
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)。
LM5185EVM-SIO — LM5185-Q1 單一隔離輸出評估模組
LM25185-DESIGN-CALC — LM25185 PSR flyback controller quick start design calculator
PMP23653 — 25W 隔離 USB-C® 電源參考設計
此參考設計是一款 25W 隔離式 USB-C 電源，具備 2 種患者保護措施 (MOPP) 隔離，適用於可攜式醫療裝置和手持式測試設備應用。USB-C 僅 PD 汲極控制器 TPS25730 可提供完整的電力輸送 (PD) 協商，且無需開發韌體。一次側穩壓 (PSR) 返馳控制器 LM25185 可免除對輔助繞組的需求，進而縮小尺寸、降低成本並提高效率。透過使用同步整流器控制器 UCC24612 與同步整流器 MOSFET CSD18543Q3A 搭配，即可實現 90.3% 的全負載高效率。此設計整合平板變壓器，以實現小巧與高功率密度。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| HTSSOP (PWP) | 14 | 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。