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L1087 Datasheet, PDF (4/10 Pages) National Semiconductor (TI) – 800mA fixed and adjustable low dropout linear regulator
ΞϓϦέʔγϣϯɾϊʔτ ( ͖ͭͮ)
ϨΪϡϨʔλʹग़ྗίϯσϯα͕઀ଓ͞Ε͍ͯΔͱ͖ʹɺೖྗ͕ά
ϥ΢ϯυʹγϣʔτͨ͠৔߹ɺग़ྗίϯσϯα͸ϨΪϡϨʔλͷग़ྗ
΁์ి͠·͢ɻ͜ͷ์ిిྲྀ͸ɺίϯσϯαͷ༰ྔɺϨΪϡϨʔ
λͷग़ྗిѹɺ͓Αͼ VIN ͷԼ߱཰ʹΑͬͯมԽ͠·͢ɻL1087
ϨΪϡϨʔλʹ͸ɺग़ྗ୺ࢠͱೖྗ୺ࢠͷؒʹμΠΦʔυ͕಺ଂ
͞Ε͍ͯΔͨΊɺ10A ʙ 20A ͷϚΠΫϩඵ୯Ґͷαʔδిྲྀʹ
଱͑Δ͜ͱ͕Ͱ͖·͢ɻ͔͠͠ɺ௒େ༰ྔͷग़ྗίϯσϯα
( ʾ 1000ЖF) ͕઀ଓ͞Εɺೖྗ͕ॠ࣌ʹάϥ΢ϯυ΁γϣʔτͨ͠
৔߹ʹ͸ɺϨΪϡϨʔλ͕ଛই͢ΔՄೳੑ͕͋Γ·͢ɻ
͜ͷ৔߹ɺFigure 4 ʹࣔ͢Α͏ʹग़ྗ୺ࢠͱೖྗ୺ࢠͷؒʹ֎
෇͚μΠΦʔυΛ઀ଓͯ͠ɺϨΪϡϨʔλΛอ͢ޢΔ͜ͱΛਪ঑͠·
͢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 ϨΪϡϨʔλʹ͸ɺσόΠεΛա೤͔Βอ͢ޢΔαʔϚϧɾ
γϟοτμ΢ϯػೳ͕಺ଂ͞Ε͍ͯ·͢ɻߟ͑ΒΕΔ͢΂ͯͷಈ࡞
৚݅Լʹ͓͍ͯɺL1087 ͷ઀߹෦Թ౓͸ 0 ˆʙ 125 ˆͷൣғ
ʹೲ·͍ͬͯͳ͚Ε͹ͳΓ·ͤΜɻΞϓϦέʔγϣϯͰͷ࠷େফඅ
ిྗͱ࠷େपғԹ౓ʹࠨӈ͞Ε·͕͢ɺώʔτγϯΫ͕ඞཁʹͳ
Δ৔߹͕͋Γ·͢ɻώʔτγϯΫ͕ඞཁ͔Ͳ͏͔Λ൑அ͢ΔͨΊʹ
͸ɺ࣍ͷΑ͏ʹɺϨΪϡϨʔλ͕ফඅ͢Δిྗ PD Λ͢ࢉܭΔඞ
ཁ͕͋Γ·͢ɻ
IIN ʹ IL ʴ IG
PD ʹ (VIN ʵ VOUT)I L ʴ VINIG
ճ࿏ʹྲྀΕΔిྲྀͱిѹΛɺFigure 6 ʹࣔ͠·͢ɻ
FIGURE 4. Regulator with Protection Diode
5.0 ώʔτγϯΫʹ͍ͭͯ
σόΠε͕͔ͳΓେ͖ͳిྲྀͰಈ࡞͍ͯ͠Δͱ͖ʹͦͷ઀߹෦Թ
౓͸্ঢ͠·͢ɻ ڐ༰͞ΕΔੑೳͱ৴པੑΛอͭͨΊʹ͜ͷԹ
౓্ঢ͸͋Δ஋Ͱ੍͕ͱ͓ͯ͘͜͠ݶॏཁͰ͢ɻ Թ౓੍ݶ஋͸
൒ಋମͷ઀߹෦͔Βಈ࡞पลͰ·ڥ؀ͷσόΠε͕࣋ͭݻ༗
ͷԹ౓্ঢ܎਺ͷ࿨Ͱܾఆ͞Ε·͢ɻ ҆ఆঢ়ଶͰͷ์೤Ϟσ
ϧͷҰྫΛ Figure 5 ʹࣔ͠·͢ɻσόΠεͰੜ੒͞Εͨ೤͸·ͣ
νοϓ͔ΒͦΕΛΞλον͍ͯ͠ΔϦʔυϑϨʔϜ্ͷύουΛ௨͠
ͯϦʔυϑϨʔϜ͔ΒύοέʔδͷϞʔϧυ෦΍ϓϦϯτج൘ɺσό
Πεपลʹ์೤͞Ε·͢ɻ ҎԼͷϦετ͕೤఍߅ʹӨڹΛ༩͑Δ
Ͱ͋Ζ͏ཁҼʹͳΓ·͢ɻ
RВJC ( σόΠεཁҼ )
ϦʔυϑϨʔϜࡐ࣭ͱαΠζ
์೤༻ͷϐϯ਺
μΠαΠζ
μΠͷ઀ணࡐ࣭
Ϟʔϧυࡐ࣭ͱαΠζ
RВCA ( पลཁҼ )
ج૷࣮൘ͷύουαΠζͱࡐ࣭
ͱ࣮૷Օॴ
࣮૷ํ๏
ج൘ࡐ࣭ͱαΠζ
഑ઢͷ෯ͱ௕͞
ۙ๣ͷൃ೤ݯ
पғ৚݅ ( ϑΝϯ༗ɾແ )
पғԹ౓
࣮૷ύουͷܗঢ়
FIGURE 6. Power Dissipation Diagram
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