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LTC3200-5 Datasheet, PDF (8/12 Pages) Linear Technology – DC/DC CONVERTERl
LTC3200/LTC3200-5
ಈ࡞
νϟʔδɾϙϯϓ͕ೖྗॆిϑΣʔζ͋Δ͍͸ग़ྗॆి
ϑΣʔζͷͲͪΒʹ͋ͬͯ΋-5$-5$΁ͷೖ
ྗిྲྀ͸ൺֱతҰఆͰ͕͢ɺΫϩοΫͷඇॏෳؒظத͸
θϩʹԼ͕Γ·͢ɻඇॏෳ࣌ؒ͸୹͍ͷͰʢ໿OTʣɺ͜
ΕΒͷ͚ܽͨ෦෼ʢϊονʣ͸ೖྗిݯϥΠϯΛΘ͔ͣʹ
ཚ͚ͩ͢Ͱ͢ɻλϯλϧͷΑ͏ͳ&43͕େ͖͍ίϯσϯ
αͰ͸ɺೖྗిྲྀมԽͱ&43ͷੵʹΑΔೖྗϊΠζ͕େ
͖͘ͳΔ͜ͱʹ஫ҙ͍ͯͩ͘͠͞ɻ͕ͨͬͯ͠ɺηϥ
ϛοΫɾίϯσϯα͸&43ಛੑ͕ฒ֎Εͯ༏Ε͍ͯΔͷ
ͰॏͶͯਪ঑͠·͢ɻ
ਤʹࣔ͞Ε͍ͯΔΑ͏ʹɺඇৗʹখ͞ͳ௚ྻΠϯμΫλ
Λ௨ͯ͠-5$-5$ʹిྗΛ͢څڙΔ͜ͱʹΑ
ΓɺೖྗϊΠζΛ͞ΒʹݮΒ͢͜ͱ͕Ͱ͖·͢ɻO)ͷ
ΠϯμΫλ͸ߴ଎ిྲྀϊονΛআͯ͠ڈɺ΄΅Ұఆͷి
ྲྀෛՙΛೖྗి΁ݯ༩͑·͢ɻίετΛԼ͛ΔͨΊɺ໿
DNʢΠϯνʣͷ1$ج൘ͷτϨʔεΛ࢖ͬͯɺO)ͷΠ
ϯμΫλΛ1$ج൘্ʹ࡞Δ͜ͱ͕Ͱ͖·͢ɻ
10nH
VIN
VIN
0.22µF
1µF
LTC3200/
LTC3200-5
GND
ਤɽO)ͷΠϯμΫλΛ࢖ͬͨ
ೖྗϊΠζͷ͞ΒͳΔ௿ݮ
32005 F02
ϑϥΠϯάɾίϯσϯαͷબ୒
஫ ҙ ɿ ϑ ϥ Π ϯ ά ɾ ί ϯ σ ϯ α ͷ ి ѹ ͸ -5$
-5$ͷىಈ࣌ʹ൓స͢Δ͜ͱ͕͋ΔͷͰɺϑϥΠ
ϯάɾίϯσϯαʹ͸λϯλϧ͋Δ͍͸ΞϧϛͷΑ͏ͳ
༗ۃੑίϯσϯα͸ܾͯ͠࢖Θͳ͍Ͱ͍ͩ͘͞ɻϑϥΠ
ϯάɾίϯσϯαʹ͸ඞͣ௿&43ηϥϛοΫɾίϯσ
ϯαΛ࢖͍ͬͯͩ͘͞ɻ
ROL(MIN)
≡
2VIN – VOUT
IOUT
≅
1
fOSCC FLY
͜͜ͰɺG04$͸εΠονϯ άप೾਺ʢ.)[ඪ४ʣͰɺ
$'-:͸ϑϥΠϯάɾίϯσϯαͷ஋Ͱ͢ɻεΠον఍߅
͕͞ΒʹՃΘΔͨΊɺνϟʔδɾϙϯϓ͸ཧ࿦্ͷݶք
ΑΓ΋௨ৗऑ͘ͳΓ·͕͢ɺෛՙ͕ඇৗʹ͍ܰΞϓϦ
έʔγϣϯͰ͸ɺ࠷ॳʹίϯσϯα஋Λܾఆ͢Δͱ͖ͷ
ΨΠυϥΠϯͱ্ͯࣜ͠Λ࢖͏͜ͱ͕Ͱ͖·͢ɻ
ηϥϛοΫɾίϯσϯα
ηϥϛοΫɾίϯσϯα͸ࡐ࣭͕ҟͳΔͱߴԹ΍ߴిѹ
Ͱ͸ҟͳͬͨ཰Ͱ༰ྔΛࣦ͍·͢ɻͨͱ͑͹ɺ93͋Δ
͍͸93ͷૉࡐͰ࡞ΒΕͨίϯσϯαͰ͸ʵˆʙˆ
ͷൣғͰ༰ྔ͕΄΅อͨΕ·͕͢ɺ;6͋Δ͍͸:7λ
ΠϓͷίϯσϯαͰ͸ಉ͡ൣғͰ༰ྔ͕͔ͳΓࣦΘΕ·
͢ɻ;6͓Αͼ:7ͷίϯσϯα͸ిѹ܎਺΋ඇৗʹྼ
Γɺఆ֨ిѹ͕ҹՃ͞ΕΔͱҎ্ͷ༰ྔΛࣦ͏͜ͱ
͕͋Γ·͢ɻ͕ͨͬͯ͠ɺҟͳͬͨίϯσϯαΛൺֱ͢
Δͱ͖ɺنఆ༰ྔ஋Λݕ౼͢ΔΑΓɺ༩͑ΒΕͨέʔε
ੇ๏ʹରͯ͠ಘΒΕΔ༰ྔΛൺֱ͢Δํ͕ଟ͘ͷ৔߹ద
੾Ͱ͢ɻͨͱ͑͹ɺఆ֨ిѹ͓Αͼఆ֨Թ౓ͷશ৚݅ʹ
Θͨͬͯɺέʔεʹೖͬͨɺµ'ɺ7ͷ:7ηϥ
ϛοΫɾίϯσϯα͸ɺಉ͡έʔεͰ͞څڙΕΔ
µ'ɺ7ͷ93ΑΓ΋େ͖ͳ༰ྔΛ༩͑Δͱ͸͔͗
Γ·ͤΜɻ࣮ࡍɺ-5$-5$ͷ΄ͱΜͲͷΞϓ
ϦέʔγϣϯͰ͸ɺ͜ΕΒͷίϯσϯα͸΄΅౳͍͠ͱ
Έͳ͢͜ͱ͕Ͱ͖·͢ɻඞཁͳ༰ྔΛશԹ౓͓Αͼશి
ѹʹΘͨͬͯ֬อ͢Δʹ͸ͲΜͳ஋ͷίϯσϯα͕ඞཁ
͔Λܾఆ͢Δʹ͸ɺίϯσϯαͷ੡଄ݩͷσʔλγʔτ
Λௐ΂Δඞཁ͕͋Γ·͢ɻ
ηϥϛοΫɾίϯσϯαͷ੡଄ͦͱݩͷ࿈བྷઌΛԼʹࣔ
͠·͢ɻ
ϑϥΠϯάɾίϯσϯα͸νϟʔδɾϙϯϓͷ౓ڧΛܾఆ
͠·͢ɻఆ֨ग़ྗిྲྀΛୡ੒͢ΔͨΊʹɺϑϥΠϯάɾί
ϯσϯαʹ͸গͳ͘ͱ΋µ'ͷ༰ྔ͕ඞཁͰ͢ɻ
ෛՙ͕ඇৗʹ͍ܰΞϓϦέʔγϣϯͰ͸ɺεϖʔε΍ί
ετΛઅ໿͢ΔͨΊɺϑϥΠϯάɾίϯσϯαΛখ͘͞
͢Δ͜ͱ͕Ͱ͖·͢ɻഒిѹνϟʔδɾϙϯϓͷ࠷খग़
ྗ఍߅ͷཧ࿦஋͸࣍ࣜͰ༩͑ΒΕ·͢ɻ
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