IR IRS2795(1,2) 240W電源解決方案

發布時間：2012-1-30 14:58 發布者：1770309616

關鍵詞： IR , IRS2795 , 電源

IR公司的IRS2795(1,2)是LLC諧振半橋轉換器控制集成電路,最高工作頻率500kHz,可編程最低和最高開關頻率,可編程軟起動頻率和時間以及死區時間,微功耗起動和超低靜態電流,具有多種保護電路,用不著在LCD和PDP TV,通信和PC開關電源以及家庭音響系統.本文介紹了IRS2795(1,2)主要特性,方框圖, 典型應用電路圖以及IRS27951 240W評估板主要指標,電路圖和材料清單與PCB布局圖.

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)典型應用:

LCD & PDP TV

Telecom SMPS, PC SMPS

Home Audio Systems

圖1.IRS2795(1,2)方框圖

圖2.IRS2795(1,2)典型應用電路圖

IRS27951評估板

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.

圖3.IRS27951評估板外形圖

IRS27951評估板主要指標:

圖4.IRS27951評估板電路圖

IRS27951評估板材料清單:

圖5.IRS27951評估板用變壓器電路圖

圖6.IRS27951評估板PCB布局圖:上,頂層;下:底層
詳情請見:

irs27951s[1].pdf (426.36 KB) 和

irac27951sr-240w[1].pdf (889.63 KB)

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