LM5161
- Wide 4.5-V to 100-V Input Voltage Range
- Integrated High-Side and Low-Side Switches
- No Schottky Diode Required
- 1-A Maximum Load Current
- Constant ON-Time Control
- No External Loop Compensation
- Fast Transient Response
- Selectable DCM Buck Operation at Light Load
- CCM Option Supports Multi-Output Fly-Buck™
- No External Ripple circuit needed (at FPWM = 0)
- Nearly Constant Switching Frequency
- Frequency Adjustable Up to 1 MHz
- Programmable Soft-Start Time
- Prebias Start-Up
- Peak Current Limiting Protection
- Adjustable Input UVLO and Hysteresis
- ±1% Feedback Voltage Reference
- Thermal Shutdown Protection
- Create a Custom Design Using the LM5161 With the WEBENCH® Power Designer
The LM5161 is a 100-V, 1-A synchronous step-down converter with integrated high-side and low-side MOSFETs. The constant-ON-time control scheme requires no loop compensation and supports high step-down ratios with fast transient response. An internal feedback amplifier maintains ±1% output voltage regulation over the entire operating temperature range. The ON-time varies inversely with input voltage resulting in nearly constant switching frequency. Peak and valley current limit circuits protect against overload conditions. The under-voltage lockout (EN/UVLO) circuit provides independently adjustable input undervoltage threshold and hysteresis. The FPWM input pin in LM5161 selects either the forced continuous conduction mode (CCM) under all load levels or the discontinuous conduction mode (DCM) under light or no load conditions. When operating in forced CCM, the LM5161 supports the multiple output and isolated Fly-Buck applications. When programmed for the DCM operation, the LM5161 provides a tightly regulated buck output without any additional external feedback ripple injection circuit.
技術文件
設計與開發
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LM5161PWPBKEVM — LM5161 寬輸入電壓同步降壓轉換器恒定導通時間評估模組
LM5161PWPFBKEVM — LM5161 寬輸入電壓 Fly-Buck 評估模組
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。
SNVC199 — LM5161 Buck Quick Start Component Selector
SNVC200 — LM5161 Fly-Buck Quick Start Component Selector
PMP20587 — 反相降壓升壓參考設計
PMP23332 — 交錯式和多相反相降壓-升壓轉換器參考設計
此參考設計運用 UCD3138064A 做為數位控制器,使用支援雙相峰值電流模式控制的能力來控制反相降壓升壓。此設計採用軟切換技術提升電源效率。輸入電壓範圍為 -62 V 至 -36 V。輸出電壓範圍可在 28 V 至 52 V 之間調整。預設輸出電壓為 48-V,最大電流為 14 A。
PMP40042 — 適用於 48V 輸入電壓隔離式系統輔助的 Flybuck電源參考設計
PMP4486 — 具有 3 路輸出的 48V 輸入電壓數位 POL 參考設計
| 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。