IR IRS27951 220W开关电源解决方案

IR公司的IRS27951/2是自振荡半桥驱动IC,每路的最大工作频率500kHz,占空比50%,工作电压高达+600VDC,可编程最小和最大开关频率,可编程软起动频率和软起动时间和死区时间,提供过流保护,欠压锁住,主要用在LCD和PDP TV,通信开关电源,PC开关电源和家庭音频系统.本文介绍了IRS27951/2主要特性, 功能方框图,典型应用电路以及220W评估板IRAC27951主要指标,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
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