|
L1087 Datasheet, PDF (4/10 Pages) National Semiconductor (TI) – 800mA fixed and adjustable low dropout linear regulator | |||
|
◁ |
ÎÏϦÎÊγϣϯɾÏÊÏ ( ÍÍ®Í)
ϨΪϡϨÊλʹà¥à¾Î¯Ï¯ÏϯαÍàªà¬ÍÎͯÍÎͱÍʹɺà³à¾Íά
ϥ΢ϯÏ
ʹγϣÊÏÍ Í¨à§ß¹Éºà¥à¾Î¯Ï¯Ïϯα͸ϨΪϡϨÊλͷà¥à¾
Îà¹à°¿Í Î͢ɻÍÍ·à¹à°¿à°¿à½¶Í¸ÉºÎ¯Ï¯Ïϯαͷ༰à¾ÉºÏ¨ÎªÏ¡Ï¨Ê
λͷà¥à¾à°¿Ñ¹ÉºÍÎͼ VIN ͷԼ߱཰ʹÎÍ¬Í¯à¸¡Ô½Í Î͢ɻL1087
ϨΪϡϨÊλʹ͸ɺà¥à¾àºà¢ ͱà³à¾àºà¢ Í·ØʹμΠΦÊÏ
Í಺à¬
ÍÎͯÍÎͨÎɺ10A Ê 20A Í·ÏΠΫϩඵà¯ÒͷαÊδిྲྀʹ
଱ÍÎÍͱÍÍ°ÍÎÍ¢É»Í ÍÍ Éºà¯à༰à¾Í·à¥à¾Î¯Ï¯Ïϯα
( ʾ 1000ÐF) Íàªà¬ÍÎɺà³à¾Íॠà£Í´Î¬Ï¥Î¢Ï¯Ï
ÎγϣÊÏÍ Í¨
à§ß¹Í´Í¸ÉºÏ¨ÎªÏ¡Ï¨ÊλÍà¬à¦Í¢ÎÕà³³à©ÍÍÎÎ͢ɻ
ÍÍ·à§ß¹ÉºFigure 4 Í´à£Í¢ÎÍÍ´à¥à¾àºà¢ ͱà³à¾àºà¢ Í·ØÍ´Ö
à·ÍμΠΦÊÏ
Îàªà¬Í ͯɺϨΪϡϨÊλÎà¸Í¢Þ¢ÎÍͱÎਪà¦Í Î
͢ɻ
FIGURE 5. Cross-sectional view of Integrated Circuit
Mounted on a printed circuit board. Note that the case
temperature is measured at the point where the leads
contact with the mounting pad surface
L1087 ϨΪϡϨÊλʹ͸ɺÏÏΠεÎա೤ÍÎà¸Í¢Þ¢ÎαÊÏϧɾ
γÏοÏμ΢ϯػೳÍ಺à¬ÍÎͯÍÎ͢ɻßÍÎÎÎÍ¢Îͯͷà²à¡
à§Ý
ԼʹÍÍͯɺL1087 Í·àªß¹à·¦Ô¹à±Í¸ 0 ËÊ 125 ËͷൣÒ
Í´à³²ÎͬͯÍͳÍÎ͹ͳÎÎͤÎÉ»ÎÏϦÎÊÎ³Ï£Ï¯Í°Í·à ·àফà¶
à°¿à¾Í±à ·àपÒÔ¹à±Í´à ¨ÓÍÎÎÍ¢ÍɺÏÊÏγϯΫÍà¶à½Í´Í³
Îà§ß¹ÍÍÎÎ͢ɻÏÊÏγϯΫÍà¶à½ÍͲÍÍÎàµà®
Í¢ÎͨÎÍ´
͸ɺà£Í·ÎÍʹɺϨΪϡϨÊλÍফà¶
Í¢ÎిྠPD ÎÍ¢à¢ÜÎà¶
à½ÍÍÎÎ͢ɻ
IIN ʹ IL ʴ IG
PD ʹ (VIN ʵ VOUT)I L ʴ VINIG
Õ³à¿Í´à½¶ÎÎిྲྀͱిѹÎɺFigure 6 Í´à£Í Î͢ɻ
FIGURE 4. Regulator with Protection Diode
5.0 ÏÊÏγϯΫʹÍÍͯ
ÏÏΠεÍÍͳÎàÍͳిྲྀͰà²à¡Í ͯÍÎͱÍʹͦͷàªß¹à·¦Ô¹
à±Í¸à§à¦¢Í Î͢ɻ Ú༰ÍÎÎà©à³³Í±à§´à½à©Îà¸ÍͨÎÍ´ÍÍ·Ô¹
à±à§à¦¢Í¸ÍÎà®Í°à©ÍͱÍÍÍÍ¯Í Ý¶à¥à½Í°Í¢É» Ô¹à±à©Ý¶à®Í¸
àµà²à¬®Í·àªß¹à·¦ÍÎà²à¡à¤ªà¸¥Í°ÎÚ¥ØÍ·ÏÏΠεÍà£ÍÝ»à¼
Í·Ô¹à±à§à¦¢Ü਺ͷ࿨Ͱܾà°ÍÎÎ͢ɻ Òà°à§à¬¶Í°Í·à¹à³¤ÏÏ
ϧͷҰྫΠFigure 5 Í´à£Í Î͢ɻÏÏΠεͰà©à©ÍÎͨ೤͸ÎÍ£
νοÏÍÎͦÎÎÎÎ»Î¿Î½Í Í¯ÍÎϦÊÏ
ÏϨÊÏà§Í·ÏοÏ
Î௨Í
ͯϦÊÏ
ÏϨÊÏÍÎÏοÎÊδͷÏÊϧÏ
à·¦ÎÏϦϯÏجàµÉºÏÏ
Πεपลʹà¹à³¤ÍÎÎ͢ɻ ÒԼͷϦεÏÍ೤à°ß
Í´Ó¨Ú¹Î༩ÍÎ
Í°ÍÎÍà½Ò¼Í´Í³ÎÎ͢ɻ
RÐJC ( ÏÏΠεà½Ò¼ )
ϦÊÏ
ÏϨÊÏà¡à£Í±Î±Î ζ
à¹à³¤à¼»Í·Ïϯ਺
μΠαΠζ
μΠͷàªà®£à¡à£
ÏÊϧÏ
à¡à£Í±Î±Î ζ
RÐCA ( पลà½Ò¼ )
ج૷࣮àµÍ·ÏοÏ
αΠζͱà¡à£
ͱ࣮૷Õॴ
࣮૷à¹à¹
جàµà¡à£Í±Î±Î ζ
à´àª¢Í·à·¯Í±à¯Í
Û๣ͷàµà³¤Ý¯
पÒà§Ý
( ÏÎϯà¼É¾à» )
पÒÔ¹à±
࣮૷ÏοÏ
Í·Üà§
FIGURE 6. Power Dissipation Diagram
http://www.national.com
4
|
▷ |