NS LM5088 75V输入异步降压电源控制方案

NS 公司的LM5088是75V高电压输入异步稳压控制器,能驱动高边N-MOSFET,具有能以最少外接元件来实现高效高输入电压降压转换器所需要的全部功能.LM50888的输入电压可从4.5V到75V,开关频率从50kHz到1MHz可编程.本文介绍了LM5088的主要特性,方框图和应用电路,以及两种评估板电路图与所用材料清单.

LM5088: Wide Input Range Non-Synchronous Buck Controller

The LM5088 high voltage non-synchronous buck controller features all the necessary functions to implement an efficient high voltage buck converter using a minimum number of external components. The LM5088 can be configured to operate over an ultra-wide input voltage range of 4.5V to 75V. This easy to use controller includes a level shifted gate driver capable of controlling an external N-channel buck switch. The control method is based upon peak current mode control utilizing an emulated current ramp. 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/low output voltage applications.
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