IR IRS27951 240W AC-DC电源解决方案

IR公司的IRS27951/2是自振荡半桥驱动器,特别适用于LLC谐振DC/DC转换器应用.器件提供过流保护,每路工作频率最高为500kHz,可编程软起动时间和频率以及死区时间,主要应用在LCD & PDP TV,电讯和PC开关电源,家庭音频系统.本文介绍了IRS27951/2主要特性, 方框图, 典型应用电路图以及IRS27951评估板主要特性,电路图,材料清单和PCB布局图.
The IRS2795(1,2) is a self oscillating half-bridge driver IC for DC-DC resonant converter applications, especially the LLC resonant half-bridge converter. The frequency and dead time can be programmed externally using two external components. The IC offers over current protection using the on state resistance of the low-side MOSFET. The IC can be disabled by externally pulling the voltage at the CT/SD pin below its enable voltage threshold.
IRS27951/2主要特性:
Simple primary-side control solution for fixed and variable frequency DC-DC resonant converters.
Max 500kHz per channel output with 50% duty cycle
Floating channel bootstrap operation up to +600Vdc
Programmable minimum and maximum switching frequency
Programmable soft start frequency and soft start time
Programmable dead time
Micropower start-up & ultra low quiescent current
Over-current protection using low side MOSFET Rds(on)
User initiated micropower “Sleep mode”
Under-voltage Lockout
Simple design with minimal component count.
Lead-free
IRS27951/2应用:
LCD & PDP TV
Telecom SMPS, PC SMPS
Home Audio Systems

图1.IRS27951/2方框图

图2.IRS27951/2典型应用电路图
IRS27951评估板
This document details the test procedure for validation of IRAC27951SR-240W Evaluation Board, featuring the IRS27951 Resonant Half Bridge controller and the IR11682 dual-channel synchronous rectification con...