onsemi lv5980mc低功率损耗、高效转换降压型稳压器设计方案.docx

OnSemi LV5980MC低功率损耗、高效转换降压型稳压器设计方案
关键词：LV5980MC,转换降压型稳压器,电源管理
OnSemi公司的LV5980MC是一款内嵌P沟道MOSFET的单通道DC-DC转换器，，最大输出电流为3A。可实现低功率损耗，操作电流大约为63uA。该芯片具有外部电容软启动、过流保护、欠压及过热关闭等功能特性。本文首先介绍LV5980MC、基本特性、内部框图及应用领域，并给出相应设计方案的设计原理图、元器件列表及PCB元件布局图。LV5980MC is 1ch DC-DC converter with built-in power remended operating rang is to maximum current is operating current is about 63uA,and low power consumption is ：·1ch SBD rectification DC-DC converter IC with built-in power Pch MOSFET·Typical value of light load mode current is 63uA·100mΩ High-side switch·The oscillatory frequency is 370kHz·When P-by-P is generated continuously,it shifts to the HICCUP opration·External capacitor Soft-start· to 23V Operating input voltage range·Output voltage adjustable to ·built-in OCP circuit with P-by-P method·Under voltage lock-out,thermal shutdown LV5980MC应用：·Set top boxes·point of load DC-DC converters·White Goods·DVD/Blu-ray™ drivers and HDD·Office Equipment·LCD monitors and TVs·POS System 
图1. LV5980MC内部方框图LV5980MC方案介绍：The LV5980MC is a fixed 370 KHz, high-output-current, Non-synchronous PWM converter that integrates a low-resistance, high-side MOSFET and a Customer Chosen, External Diode for the rectification. The LV5980MC