IR IRS2795(1,2) 240W电源解决方案

IR公司的IRS2795(1,2)是LLC谐振半桥转换器控制集成电路,最高工作频率500kHz,可编程最低和最高开关频率,可编程软起动频率和时间以及死区时间,微功耗起动和超低静态电流,具有多种保护电路,用不着在LCD和PDP TV,通信和PC开关电源以及家庭音响系统.本文介绍了IRS2795(1,2)主要特性,方框图, 典型应用电路图以及IRS27951 240W评估板主要指标,电路图和材料清单与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.
IRS2795(1,2)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
IRS2795(1,2)典型应用:
LCD & PDP TV
Telecom SMPS, PC SMPS
Home Audio Systems

图1.IRS2795(1,2)方框图

图2.IRS2795(1,2)典型应用电路图
IRS27951评估板
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