NS LM5119双路DC-DC 20A电源控制方案

NS 公司的LM5119是双路同步电流模式降压控制器，工作电压从5.5V到65V，开关频率从50kHz 到 750kHz，具有强固的3.3A峰值栅极驱动器，可编程输出从0.8V起到输入电压的90%，输出电流高达20A，主要用在需要精密电压稳压器如通信，汽车电子以及工业控制应用。本文介绍了LM5119主要特性，方框图，典型应用电路图和LM5119EVAL评估板主要特性，电路图和材料清单（BOM）。

The LM5119 is a dual 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.
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