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

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 controller. The document includes schematic diagram, test setup, test procedure, and test results.

图3.IRS27951评估板外形图

IRS27951评估板主要指标:


图4.IRS27951评估板电路图

IRS27951评估板材料清单:


图5.IRS27951评估板用变压器电路图


图6.IRS27951评估板PCB布局图:上,顶层;下:底层
详情请见:
http://www.irf.com/product-info/datasheets/data/irs27951s.pdf
和
http://www.irf.com/technical-info/refdesigns/irac27951sr-240w.pdf