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
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