PCB表面黏著電源元件的散熱設計PCB í-±Hq¤ó]-p 1 -A@ 3 -2003~12 ¤31¤é §tj--]-p±Mú±M±Mq¤l¤u{¤H§N¤w L ± ò P ¤ o °e d §ós-¤Hê §ó§t ¨ú-q\ °hX q¤l¤u{¨ ¨s§i yê °Q [ i| y°i°T§ §}±PCBí-±Hq¤ó]-p ¤WG 2002 ~10¤26¤é]-p¤u{v±NV¨Vhab]-p¤¤±í-±H¤óA]Aq¤O¤óCq±`Aq¤ ¤óiHqL¨§¨ê¨ohlqHOù§C Aí-±H¤ ó¤ià±o¤èkA ¨abL¨êqO¤WLu ¨C ¤Fo-°DGqO]-p¤¤¨s-nh¤L¨êqOH ¤HMicrel ¤qí-±Hu- °¨A¤pób¨¤@-L¨êqO ` §@ °O§_iH±`¤u§@C-¤Fq-n¨DC ¨t-n¨D VOUT= 5.0V VIN(MAX)= 9.0V VIN(MIN)= 5.6V IOUT= 700mAè °§U N¨^X ó§- p§- q¤lsó q~ yê~ EE Times Network EBN Online°P = 100% TA = 50 J ¤W-±¨t-n¨D 750mA MIC2937A -5.0BU -A¨° °G VOUT= 5V 2% ( La±p ) TJ MAX= 125 J ±TO-263A?JC = 3J /W ) ?CS 0J /W (±k±bqO¤W ì¨B-p VOUT(MIN) = 5V 5 2% = 4.9V PD = (VIN(MAX) - VOUT (MIN) ) I OUT+ (VIN(MAX) I) = [9V- 4.9V] 7 00mA + (9V 15mA) = 3W פW¤¤j -A? T = TJ(MAX) - TA= 1……