LM5046八分之一砖形电源电路设计

LM5046是集成了MOSFET驱动器的相移全桥PWM控制器,DC/DC转换器的输入电压高达100V.器件包括了实现相移全桥拓扑电源转换器所需的全部特性,提供两路高边和低边2A栅极驱动器,用于外部四个桥接MOSFET栅极驱动以及次级同步整流MOSFET的控制信号.其它特性还包括双模式过流保护,可编程软起动,线路UVLO和OVP,此级和初级整流器的控制时序,2MHz振荡器和热关断,可用在高输入的通信电源.

LM5046主要特性:

■ Highest Integration Controller for Small Form Factor, High Density Power Converters

■ High Voltage Start-up Regulator

■ Intelligent Sync Rectifier Start-up Allows Linear Turn-on into Pre-biased Loads

■ Synchronous Rectifiers Disabled in UVLO mode and Hiccup Mode

■ Two Independent, Programmable Dead-Time Adjustments to Enable Zero-Volt Switching.

■ Four High Current 2A Bridge Gate Drivers

■ Wide-Bandwidth Opto-coupler Interface

■ Configurable for either Current Mode or Voltage Mode Control

■ Dual-mode Over-Current Protection

■ Resistor Programmed 2MHz Oscillator

■ Programmable Line UVLO and OVP