NS LM5046八分之一砖形电源参考设计
NS公司的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.本文介绍了LM5046主要特性, 方框图, LM5046 评估板主要特性和电路图,材料清单以及1/8砖形电源参考设计主要特性.
LM5046: Phase-Shifted Full-Bridge PWM Controller with Integrated MOSFET Drivers
The LM5046 PWM controller contains all of the features necessary to implement a Phase-Shifted Full-Bridge topology power converter using either current mode or voltage mode control. This device is intended to operate on the primary side of an isolated dc-dc converter with input voltage up to 100V.
This highly integrated controller-driver provides dual 2A high and low side gate drivers for the four external bridge MOSFETs, plus control signals for the secondary side synchronous rectifier MOSFETs. External resistors program the dead-time to enable zero-volt switching of the primary FETs.
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