λЁκ TFT LCD Panel ޑႝྍी /ම୯ଈ! ˧/ق ߈ԃٰǴᒿనᡉҢᏔȐLiquid Crystal Display, LCDȑ࣬ᜢזޑೌמೲว Ǵ٬ளనᡉҢᏔςቶޑݱᔈҔӧӚሦୱύǴԿϞѠςԋࣁӄౚ LCD Panel ޑғౢख़ᙼǶᆶޑཱུጕᆅȐCathode Ray Tube, CRTȑᡉҢᏔКၨଆٰǴ ᗨฅనᡉҢᏔӧᄊៜᔈБय़ۘคکݤཱུጕᆅᡉҢᏔ࣬ϰእǴՠڀځԖ ᡏᑈλǵख़ໆᇸǵեႝໆǵόϸӀǵեᒟǵฝय़คଢᛉϷคᓉႝᓬᗺǴς ٬ளనᡉҢᏔᅌӦڗжޑཱུጕᆅᡉҢᏔԋࣁϞआޑѳय़ᡉҢ Ꮤ(Flat-Plane Display, FPD)Ƕ ԶقǴనᡉҢᏔҁيሡाಔङӀႝၡǴаϷಔଯਏୃޑᓸႝྍ ٰڋჹКǴЪԜୃᓸႝྍѸሡाૈӧεॄޑၩᡂጄൎϣᆢᛙޑۓᒡр ႝᓸǶҗܭҞλЁκనᡉҢᏔ࣬ޑᜢౢࠔ֡රᖓࠠϯวǴ٬ளλЁκన ᡉҢᏔޑङӀႝၡᆶୃᓸႝྍҭ۳ࡧѳϯीǶӢԜǴӵՖीᡏᑈλǵਏ ଯޑనᡉҢᏔङӀႝၡᆶୃᓸႝྍǴςԋࣁౢࠔीख़ाޑፐᚒǶԖ᠘ܭ ԜǴҁЎஒᇥܴӵՖٰीрᡏᑈλǵਏଯޑనᡉҢᏔୃᓸႝྍٮᔈᏔǶ ˨.ႝၡࢎᄬ LCD ޑႝྍሡх֖ङӀ(Backlight)ޑႝྍගکٮय़݈(Panel)ޑႝྍ ᆅǴӵკ 1 ܌ҢǶ ˩˶̂̀ ˣ̂̊˸̅ ˦̂̈̅˶˸ ˠ˴́˴˺˸̀˸́̇ ˚˴̇˸ʳ̂́ ˟˖˗ʳˣ˴́˸˿ ˚˴̇˸ʳ̂˹˹ ˕˴˶˾˿˼˺˻̇ʳ˗̅˼̉˸̅ ˟˖˗ʳ˕˴˶˾˿˼˺˻̇ კ 1 LCD ႝၡࢎᄬკ ˚˴̀̀˴ ҁЎӧԖᜢనᡉҢᏔୃᓸႝྍޑीǴԶ୷ҁనᡉҢᏔୃޑᓸႝ ྍٮᔈᏔѸाૈගٮΟಔᒡрႝྍǴځύಔࢂ Source ႝྍǴќѦٿಔ߾ࢂ ࣁ҅ႝᓸќࣁॄႝᓸ ޑGate ႝྍǶҗܭనᡉҢᏔӧᏹբਔǴаᗉխన ཞᚯǴనႝཱུޑႝᓸѸόᘐޑᙌᙯǴ Vcom ႝᓸ൩ࢂࣁԜҔǶќѦ ᗋሡाԖ Gamma ਠ҅ޑႝᓸǶ ୃޑᓸႝྍीБԄǴࢂҗಔ DC-DC ޑϲᓸᙯඤᏔٰౢғ Source ႝྍǴӆճҔԜᙯඤᏔ ޑPWM Ϫဦૻဦ Charge Pump рॺךा ॄ҅ޑGate ႝྍǶӵკ 2 ܌ҢǶ C2 C3 + + Gate on C4 _ C6 C5 Gate off _ L + + VIN S C1 _ Source LOAD _ Control Circuit კ 2 LCD ୃᓸႝྍπբኳԄ ೭ᅿޑݤӳೀࢂӧܭѝሡाಔϪඤԄႝྍ IC Ǵ܌ሡᡏᑈၨλǴฅԶǴ҅ॄ ޑGate ႝྍගࢂٮҗϲᓸᙯඤᏔٰޑǴ٠ؒԖӣૻڋဦǴ܌аᛙᓸޑ܄ ၨৡǶӝࠠޑనᡉҢᏔୃᓸႝྍ IC עΟಔᙯඤᏔϣࡌӳΑǴ٠ЪᗋԖ ໒ᐒׇӈޑڋϷᒱᇤୀෳǶ ˩.ीჴٯ ۭΠஒа AIC1882ǴᒡΕႝᓸࣁ 3.3V ޑٯࣁݩηǴᇥܴӵՖа AIC1882 ౢғ Source ႝྍࣁ 10Vǵ҅ ޑGate ႝྍࣁ 18V Զॄ ޑGate ႝྍࣁ-5V ޑ నᡉҢᏔୃᓸႝྍႝၡǶ 3-1 ᔈҔႝၡ კ 3 ࣁనᡉҢᏔϐୃᓸႝྍޑᔈҔႝၡǴа؊ՎъᏤᡏ܌рޑΟಔᒡ рϲᓸԄᙯඤᏔ AIC1882 ࣁٯηǶAIC1882 х֖ಔۓڰᓎǵଯਏޑϲᓸ ԄᙯඤᏔǴᗋԖٿಔа charge-pump БԄᛙᓸᒡрॄ҅ޑႝྍǶځύϲᓸԄᙯ ඤ Ꮤ ܌٬ Ҕ ޑ ڋБ Ԅ ࣁ ႝ ࢬ ኳ Ԅ ݢ ે ޑቨ ࡋ ፓ ᡂ (Current-Mode Pulse-Width-Modulation)Ǵᏹբᓎࣁ 1MHzǴႝၡ܄ёၲזډೲޑᄊៜᔈ ܄Ǵ٠ёӦ෧ϿѦᔈҔႝၡޑϡҹᡏᑈǶ AIC1882 ҁيϣࡌ҅ǵॄ charge-pump Ǵ٠ЪԖ Gate ᒡрႝᓸޑᛙᓸӣ ڋႝၡٰ٬ځᒡрႝᓸૈᛙӧ܌ሡޑႝᓸྗՏǶ D1 Vmain = +10V, 200mA L1 6.8uH C1 SR24 10uF 1 2 R3 Vin = 2.7~5.5V 100k 3 R4 4 10 C5 0.1uF 5 6 C7 7 0.1uF 8 U1 16 TGND FB 14 PGND IN SUPP GND DRVP REF SUPN FBP DRVN FBN SHDN 0.1uF 10uF 13K 15 LX INTG C2 C3 R2 AIC1882 RDY R1 91K Vmain C4 13 12 0.1uF 11 10 Vmain C6 0.1uF D2 9 C8 SW1 0.1uF BAT54S SW SPDT C9 R5 R6 680pF R8 R7 49.9k 200k 49.9k C11 0.22uF Vpos = +18V, 10mA 670k C10 1uF C13 1uF Vneg = -5V, 20mA D3 C12 0.1uF BAT54S კ 3 ᔈҔႝၡ 3-2! JD фૈϟಏ 1.໒ᐒׇӈ εϩ ޑLCD य़݈Ԗሡाޑႝྍ௴ׇӈǶAIC1882 ӧϣୖޑԵႝ ᓸ(Reference Voltage)ଆٰࡕǴSource ޑϲᓸᙯඤᏔௗ௴ǴԶӧϲᓸᙯඤ ᏔၲډᛙࡕۓǴॄᓸ ޑGate ႝྍௗ௴Ǵӧॄᓸ ޑGate ႝྍၲډᒡрॶޑ 88%ࡕǴ҅ᓸ ޑGate ႝྍௗ௴Ǵӧ҅ᓸ ޑGate ႝྍၲډᒡрॶ ޑ90% ࡕǴႝྍྗޑഢֹԋૻဦ(Power-ready)வଯႝՏډեႝՏǴаᇥܴΟಔႝ ྍૻဦࣣ௴ֹԋǶ 2.ࢋ௴܄ AIC1882 ϣࡌޑΟಔႝྍᒡрӧ໒௴ਔࣣԖࢋ௴܄ǴΨ൩ࢂᒡрႝᓸ όᕓ໔໒௴Ǵӧࢤਔ໔ϣ(൳ঁ ms)ၲډᒡрᛙᓸॶǴࢋ௴܄ёа෧Ͽ ᒡрႝᓸޑၸፂ(overshoot)ϷᗉխᒡΕޑΕႝࢬ(Inrush current)Ƕ 3.ྗഢֹԋૻဦ ྗഢֹԋૻဦ(power-ready)ࢂঁཱུؕ໒ၡ(open drain)ޑႝၡᒡрǶѦ ௗঁႝߔ ډVcc ࣁ high ྗՏǴΟಔႝྍᒡрς௴ֹԋࡕǴଌр ૻဦ٬ MOSFET Ѻ໒Ǵ٬ளྗഢֹԋૻဦ ډlow ྗՏǴᙖаዴᇡΟಔᒡрႝ ྍςྗഢֹǶ 4.ၸႝࢬߥៈ AIC1882 ϣࡌၸႝࢬߥៈфૈǴᒡрॄၩႝࢬၸεਔǴAIC1882 ୀෳ ډႝགႝࢬǴႝགႝࢬޑঢ়ॶၲ ډ1.5A ਔǴज़ڋՐॄၩႝࢬόӆ۳ܜၩǴ аߥៈϣޑϪඤ໒ᜢ MOSFETǶ 5.ၸߥៈ AIC1882 ϣࡌၸߥៈ(Thermal shutdown)Ǵྕࡋၲ ډ160ʚਔǴAIC1882 ߡ٬ΟಔᒡрᜢǴаߥៈϣႝၡǴྕࡋ۳Πե 20ʚ(Thermal Hysteresis)ࡕǴӆख़ཥ௴ ICǶ 3-3 ຼᜐϡҹᒧ ϲᓸᙯඤᏔ(Boost Converter) I. ϲᓸႝག (L) ϲᓸႝགޑགॶελᆶᙯඤᏔޑᏹբᓎଯեҭቹៜډႝགႝࢬޑᅎݢ ελǶ Lt § Vin V · ¨¨1 in ¸¸ (1) f OSC 'I L © Vmain ¹ ځύfOSCࣁϲᓸԄᙯඤᏔޑᏹբᓎǴ̴ILࣁႝགᅎݢႝࢬǶӧԜीύǴۓ fOSC=1MHzǵ̴IL=350mAǴ߾ϲᓸႝགޑελёҗΠԄ،ۓϐ Lt Vin D | 6.3PH (2) f OSC 'I L ܌аᒧϲᓸႝག L ࣁ 6.8μHǶ ԜѦǴࣁᗉխႝག៓ޑႫکǴ܌ᒧҔޑႝགޑႫکႝࢬѸεܭᙯඤႝ ၡޑനεႝགႝࢬঢ়ॶǶଷനεᒡрႝࢬIOUT(MAX)ࣁ 300mAǵႝၡޑᙯඤਏ Kࣁ 0.8Ǵ߾നεႝགႝࢬޑঢ়ॶёҗΠԄ،ۓϐ Vin I PEAK I IN max D 2 u f OSC L I OUT ( MAX ) Vmain K Vin § Vin V · ¨¨1 in ¸¸ | 1300mA (3) 2 u f OSC L © Vmain ¹ II. ᒡΕႝ (CIN) ࣁफ़եфϪඤ໒ᜢזޑೲϪඤ܌ౢғޑᒡΕႝᓸᅎݢǴࡌ௦ҔڀԖե ਏՍᖄႝߔȐEquivalent Series Resistance, ESRȑޑഏౠႝٰբࣁᒡΕႝ ǶӧԜीύǴᒡΕႝCINᒧҔ 10μF/10VޑഏౠႝǶ III. ᒡрႝ (COUT) ऩۓനεᅎݢႝᓸ̴VOUT1ࣁ 30mVǴ߾നλᒡрႝёҗ(4)،ۓϐ I COUT t OUT MAX D | 6.7 PF (4) f OSC 'Vmain ԜѦǴᒡрႝᓸޑᅎݢελҭډڙᒡрႝҁ يESR ελޑቹៜǶ 'Vmain 'I L ESR (5) ӧԜीύǴᒡрႝCOUTᒧҔ 10μF/16VޑഏౠႝǶ IV/ ϩᓸႝߔ (R1ᆶR2)! ӧࡑᐒਔ໔ǴϩᓸႝߔஒុૈޑໆǴӢԜᒧҔၨεޑϩᓸႝߔǴஒ ёࡋޑᕭ෧ᙯඤႝၡࡑޑᐒႝࢬǶӧԜीύǴᒧR2ࣁ 13k:Ǵ߾R1ёҗΠ Ԅ،ۓϐ Vmain R1 § R · 1.25 u ¨¨1 1 ¸¸ (6) © R2 ¹ 91 ҏk: V. ံᓭᑈϩႝ (C˦) ࣁᗉխҗسܭޑόᛙۓԋᒡрႝᓸޑᅎݢၸεᆶႝၡޑᙯඤਏၸ եǴAIC1882 ሡᚐѦံޑᓭᆛၡٰံᓭځӣၡǶံޑᓭᆛၡǴҗ ঁRcompٰۓӣၡޑቚаගܹႝၡޑᄊៜᔈǶRcomp،ࡕۓǴ߾ Սᖄঁ Ccomp ٰۓӣၡޑ႟ᗺٰᆢႝၡޑᛙ܄ۓǴനࡕӆ٠ᖄঁ Ccomp1ࢂाҔٰନҗᒡрႝᆶځҁޑيESR܌ԋޑ႟ᗺǶӧAIC1882 ޑ ीύǴӢࣁRcompςϣࡌӧICϣΑǴԶCcomp˞ӧჴሞޑӣᆛၡύ٠όሡा ೭ঁႝٰံᓭǴ܌аѦѝሡाᒧঁံᓭᑈϩႝC˦=680pFջёၲډ ၡᛙ่݀ޑۓǶ кႝᔅ(Charge Pump) I. ०Ⴍႝ(Flying Capacitor) ०ႭႝࢂࣁкႝᔅሀૈໆޑύᝩઠǴԶقǴ०Ⴍႝޑॶε ऊکᒡрႝऊࣁ 1:10 ޑКॶǶӧեᒡрႝࢬޑᔈҔΠǴ0.1uF ࣁεϩ ޑ०ႭႝॶǶ II. ᒡрႝ (COUT) ᒡрႝޑॶᆶႝޑESRቹៜډᒡрޑᅎݢႝᓸǶଷനεᒡрႝࢬ IOUT=30mA Ǵ fOSC ࣁ к ႝ ᔅ ޑϪ ඤ ᓎ 500kHz Ǵ ന ε ᒡ р ᅎ ݢႝ ᓸ Vripple=50mVǴ߾നλᒡрႝёҗаΠϦԄٰीᆉளډ: COUT t I OUT =0.6uF 2 u f OSC u Vripple ܌аᒧᒡрႝCOUT=1uFǶ! III. ᒡрႝᓸीᆉ(R5,R6,R7 ᆶR8) ҅ॄᓸкႝᔅޑᒡрႝᓸॶёаҗΠӈϦԄளډ: R5 §V · R7 ¨ pos 1¸ ¸ ¨ © Vref ¹ R6 §V · R8 ¨ neg ¸ ¨V ¸ © ref ¹ ځύVposࣁ҅ᓸкႝᔅႝᓸᒡрǴVnegࣁॄᓸкႝᔅႝᓸᒡрǴVrefࣁୖ ԵႝᓸॶǶॺךᒧ R5 670 ҏk:Ǵ R6 200 k:Ǵ R7 50 k:Ǵ R8 50 k:Ƕ ԿԜǴΟಔᙯඤᏔຼޑᜐϡҹॶςεठीᆉрٰǶ୷ҁࣁᡏᡏᑈૈၲ ډനλϯǴႝགᆶႝޑᒧҔа಄ӝႝᓸႝࢬޑೕջёǴϡҹޑᡏᑈ߾ёаᅰ ёૈޑλǶ ˪/ෳ၂่݀ ҁЎаᒡΕႝᓸࣁ 3.3Vǵᒡр ޑSource ႝᓸǵ҅ ޑGate ႝᓸᆶॄ ޑGate ႝᓸϩձࣁ 10Vǵ18V ᆶ-5V ޑٯࣁݩǴჴሞᇙբკ 3 ϐୃᓸႝྍٮᔈᏔǴ٠ ՉႝၡໆෳǶკ 4 ࣁ Source ႝྍǵ҅ ޑGate ႝྍᆶॄ ޑGate ႝྍޑᒡр ႝࢬϩձࣁ 100mAǵ10mA ᆶ 10mA ਔǴϲᓸᙯඤᏔޑϪඤݢᆶႝགႝࢬݢ Ƕკ 5 ࣁ Source ႝྍᒡрႝࢬவ 50mA ᡂϯ ډ200mA ޑᒡрᄊៜᔈݢ Ƕკ 6 ߾ࣁ Power-ready ૻဦ߄ҢǴΟಔᒡрྗഢֹԋࡕǴPower-ready ૻဦவଯྗഢډեྗՏǶკ 7 ࣁ Source ႝྍǵ҅ ޑGate ႝྍᆶॄ ޑGate ႝྍޑᒡрႝࢬϩձࣁ 200mAǵ10mA ᆶ 10mA ਔǴΟಔᒡрႝᓸૻဦ௴ޑ ݢǶკ 8 ࣁ҅ ޑGate ႝྍᆶॄ ޑGate ႝྍޑᒡрႝࢬࣣࣁ 10mA ਔǴ Source ႝྍࣁόӕॄၩႝࢬΠ܌ҢޑႝၡᙯඤਏǴᡏႝၡޑᙯඤਏനଯ ёၲ ډ81%Ƕ VLX Output ripple IL Iout !!!!! ! კ 4 ϲᓸᙯඤᏔޑϪඤݢᆶႝགႝࢬ კ 5 ϲᓸᙯඤᏔᄊៜᔈ!ݢ VSHDN VSHDN Vmain Vpos Vneg RDY Vpos კ 6 Power-ready ૻဦ߄Ң ! ! ! ! ! ! ! კ 7 Οಔႝᓸ ޑPower-on sequence! ! ˸˹˹˼˶˼˸́˶̌ ˌ˃ˁ˃˃ʸ ˋ˃ˁ˃˃ʸ ˸˹˹˼˶˼˸́˶̌ʻʸʼ ˊ˃ˁ˃˃ʸ ˉ˃ˁ˃˃ʸ ˈ˃ˁ˃˃ʸ ˇ˃ˁ˃˃ʸ ˆ˃ˁ˃˃ʸ ˅˃ˁ˃˃ʸ ˄˃ˁ˃˃ʸ ˃ˁ˃˃ʸ ˃ ˈ˃ ˄˃˃ ˄ˈ˃ ˿̂˴˷ʻ̀˔ʼ ˅˃˃ ˅ˈ˃ კ 8 ᙯඤਏ ˫.่ፕ җܭλЁκనᡉҢᏔ࣬ޑᜢౢࠔςԋࣁѱЬࢬǴӢԜӵՖीᡏᑈ λǵਏଯޑႝྍᙯඤᏔςԋࣁనᡉҢᏔ࣬ᜢౢࠔीख़ाޑᕉǶԖ᠘ܭ ԜǴҁЎଞჹλЁκనᡉҢᏔ܌ሡୃޑᓸႝྍϩǴගٮаᗭϣࡌΟಔᒡр ޑႝྍᙯඤ IC ٰीрӝޑనᡉҢᏔୃᓸႝྍٮᔈᏔǴ٠ܭЎύගٮӵ ՖᒧҔӝޑႝၡຼᜐϡҹٰ٬ளᡏᙯඤႝၡૈᛙޑۓπբЪਏၨଯ٠٬ ځᡏᑈૈၨλϯǶ