IR IRS2795(1,2) 240W电源解决方案

2012年01月30日 14:58 发布者：1770309616

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.