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:
http://www.irf.com/product-info/datasheets/data/irs27951s.pdf
和
http://www.irf.com/technical-info/refdesigns/irac27951sr-240w.pdf
