开关电源设计的散热分析技术 !!!! IC SIMPLE SWITCHERLM5576 LM25576 IC IC !!!! 1566 Frederik Dostal! 20072 !!!!JC IC !!!! JA IC PCB PCB !!!! !!!! IC ǖ Pbias = Iq VIN ǖ Pcond = duty cycle RdsonIOUT2 ǖ Pswitch =!)IOUTVIN*/2F!)tLH + tHL* !!!!FtLH tHL !!!! , Rdson , ESR !!!! IC ICPCB JC. JC 30004609 1. 5V IOUT VIN !!!! WEBENCH WebTHERM IC LM557 x LM2557 x SIMPLE SWITCHER 2 WebTHERM AN-1566 2007 National Semiconductor Corporation 300046 www.national.com AN-1566 30004610 2. WebTHERM !!!!IC !!!! !!!! IC !!!!JC !!!! 125 C, 150 C SIMPLE SWITCHER LM2590HV.AQ o o www.national.com 2 AN-1566 3 www.national.com ǖwww.national.com ǖ 1. /ǖa b 2. // CSP-9-111C2 CSP-9-111S2CSP-9-111S2"" RoHS AN-1566 National Semico……