LM25117中文资料具有跟踪功能的 4.5-42V 宽输入电压、电流模式同步降压控制器数据手册TI规格书

描述 Description

The LM25117 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.

特性 Features

• Emulated peak current mode control
• Robust 3.3A peak gate drives
• Free-run or synchronizable clock up to 750kHz
• Programmable output from 0.8V
• Analog current monitor
• Hiccup mode over current protection
• Programmable line under-voltage lockout
• Thermal shutdown
• TSSOP-20EP (Thermally enhanced)
• LLP-24 (4mmx4mm)