Texas Instruments LM3477 Buck Controller Evaluation Module
Bayanin samfur
Module LM3477 Buck Controller Evaluation Module yanayi ne na yanzu, babban tashar N tashar FET mai kulawa. Ana yawan amfani dashi a cikin daidaitawar kuɗi.
LM3477 yana ba da damar babban nau'ikan abubuwan shigarwa, abubuwan fitarwa, da lodi.
Hukumar tantancewa ta zo shirye don aiki tare da takamaiman yanayi.
Umarnin Amfani da samfur
- Tabbatar cewa abubuwan haɗin wutar lantarki (catch diode, inductor, da filter capacitors) an sanya su kusa tare akan shimfidar PCB. Ka sanya alamomin da ke tsakanin su gajeru.
- Yi amfani da lambobi masu faɗi tsakanin abubuwan wutar lantarki da haɗin wutar lantarki zuwa da'irar mai canza DC-DC.
- Haɗa ginshiƙan ƙasa na shigarwar da fitarwa na tace capacitors kuma kama diode kusa da yuwuwar ta amfani da dabarun shimfidawa da suka dace.
Dokar Kaya (BOM)
| Bangaren | Daraja | Lambar Sashe |
|---|---|---|
| CIN1 | Saukewa: 594D127X0020R2 | A'a, haɗa |
| CIN2 | A'a, haɗa | A'a, haɗa |
| COUT1 | LMK432BJ226MM (Taiyo Yuden) | LMK432BJ226MM (Taiyo Yuden) |
| COUT2 | DO3316P-103 (Coilcraft) | 1.8k ku |
| L | CRCW08051821FRT1 (Vitramon) | 12 nF/50V |
| RC | VJ0805Y123KXAAT (Vitramon) | A'a, haɗa |
| Bayani na CC1 | 5 A,30 ku | Bayanan Bayani na IRLMS2002 |
| Bayani na CC2 | 100 V, 3 A | MBRS340T3 (Motorola) |
| Q1 | 20 | CRCW080520R0FRT1 (Vitramon) |
| D | 1k ku | CRCW08051001FRT1 (Vitramon) |
| RDR | 16.2k ku | CRCW08051622FRT1 (Vitramon) |
| RSL | 10.0k ku | CRCW08051002FRT1 (Vitramon) |
| Saukewa: RFB1 | 470 pF | VJ0805Y471KXAAT (Vitramony) |
| Saukewa: RFB2 | 0.03 | A'a, haɗa |
Ayyuka
Ana nuna inganci vs kaya da inganci vs jadawali VIN a cikin littafin mai amfani don tunani.
Mahimman Matsala
Don tsarin da ya dace na LM3477 Buck Controller Evaluation Module, bi waɗannan jagororin:
- Sanya abubuwan wutan lantarki (catch diode, inductor, da filter capacitors) kusa da shimfidar PCB. Ka sanya alamomin da ke tsakanin su gajeru.
- Yi amfani da lambobi masu faɗi tsakanin abubuwan wutar lantarki da haɗin wutar lantarki zuwa da'irar mai canza DC-DC.
- Haɗa ginshiƙan ƙasa na shigarwar da fitarwa na tace capacitors kuma kama diode kusa da yuwuwar ta amfani da dabarun shimfidawa da suka dace.
Koma zuwa littafin mai amfani don zane na PCB Layout Board LM3477.
Gabatarwa
LM3477 yanayi ne na yanzu, babban gefen tashar N FET mai sarrafa. An fi amfani dashi a cikin daidaitawar kuɗi, kamar yadda aka nuna a hoto 1-1. Duk abubuwan da ke tafiyar da wutar lantarki na kewaye suna waje zuwa LM3477, don haka LM3477 za a iya saukar da babban nau'in bayanai, abubuwan fitarwa, da lodi.
Kwamitin kimantawa na LM3477 ya zo a shirye don aiki a cikin yanayi masu zuwa:
- 4.5V ≤ VIN ≤ 15 V
- VUT = 3.3 V
- 0 A ≤ GASKIYA ≤ 1.6 A
- Ana ba da kewayawa da BOM na wannan aikace-aikacen a cikin Hoto 1-1 da Table 1-1.
Tebur 1-1. Bill of Materials (BOM)
| Bangaren | Daraja | Lambar Sashe |
| CIN1 | 120µF/20V | Saukewa: 594D127X0020R2 |
| CIN2 | Babu haɗin kai | |
| COUT1 | 22µF/10V | LMK432BJ226MM (Taiyo Yuden) |
| COUT2 | 22µF/10V | LMK432BJ226MM (Taiyo Yuden) |
| L | 10H, 3.8 A | DO3316P-103 (Coilcraft) |
| RC | 1.8k ku | CRCW08051821FRT1 (Vitramon) |
| Bayani na CC1 | 12 nF/50V | VJ0805Y123KXAAT (Vitramon) |
| Bayani na CC2 | Babu haɗin kai | |
| Q1 | 5 A,30 ku | Bayanan Bayani na IRLMS2002 |
| D | 100 V, 3 A | MBRS340T3 (Motorola) |
| RDR | 20 Ω | CRCW080520R0FRT1 (Vitramon) |
| RSL | 1k ku | CRCW08051001FRT1 (Vitramon) |
| Saukewa: RFB1 | 16.2k ku | CRCW08051622FRT1 (Vitramon) |
| Saukewa: RFB2 | 10.0k ku | CRCW08051002FRT1 (Vitramon) |
| CFF | 470 pF | VJ0805Y471KXAAT (Vitramony) |
| RSN | 0.03 Ω | WSL 2512 0.03 Ω ± 1% (Dale) |
Ayyuka
- Hoto na 2-1 zuwa Hoto 2-2 yana nuna wasu bayanan ma'auni da aka ɗauka daga kewayen da ke sama akan allon ƙima na LM3477. Hakanan za'a iya amfani da wannan hukumar tantancewa don kimanta da'irar mai sarrafa kuɗaɗen da aka inganta don wani wurin aiki na daban ko don kimanta ciniki tsakanin farashi da wasu sigogin aiki. Domin misaliampHar ila yau, ana iya ƙara ƙarfin juzu'i ta amfani da ƙananan RDS(ON) MOSFET, ripple vol.tage za a iya sauke tare da ƙananan kayan fitarwa na ESR, kuma za'a iya canza madaidaicin ƙofa a matsayin aikin RSN da RSL resistors.
- Ana iya haɓaka ingantaccen juzu'i ta amfani da ƙaramin RDS(ON) MOSFET, duk da haka, yana faɗuwa azaman shigarwa vol.tage qara. Ƙwarewar yana raguwa saboda ƙarar lokacin gudanarwa na diode da ƙara yawan asarar sauyawa. Canza asarar ta faru ne saboda asarar canjin Vds × Id da kuma asarar cajin ƙofar, duka biyun ana iya saukar da su ta amfani da FET tare da ƙarancin ƙarfin ƙofar. A ƙananan hawan keke, inda mafi yawan asarar wutar lantarki
a cikin FET yana daga hasara mai canzawa, cinikin kashe mafi girma RDS (ON) don ƙananan ƙarfin ƙofar zai ƙara haɓaka aiki.
- Hoto 3-1 yana nuna ma'anar bode na LM3477 buɗaɗɗen amsa mitar madauki ta amfani da abubuwan waje da aka jera a cikin Tebu 1-1.
Yanayin Hysteretic
Yayin da aka rage nauyin halin yanzu, LM3477 a ƙarshe zai shiga yanayin aiki na 'hysteretic'. Yaushe
lodin halin yanzu yana faɗuwa ƙasa da madaidaicin yanayin hysteretic, fitarwa voltage tashi kadan. The overvoltage kariya (OVP) comparator yana jin wannan tashin kuma yana sa MOSFET ta rufe. Yayin da kaya ke fitar da halin yanzu daga cikin capacitor na fitarwa, fitarwa voltage yana faɗuwa har sai ya kai ƙananan kofa na mai kwatanta OVP kuma ɓangaren ya fara canzawa. Wannan halin yana haifar da ƙananan mitar, mafi girman fitarwa zuwa ganiya voltage ripple fiye da na al'ada bugun jini nisa modulation makirci. Girman fitarwa voltage ripple yana ƙaddara ta matakan OVP, waɗanda ake magana da su zuwa juzu'in martanitage kuma yawanci 1.25 V zuwa 1.31 V. Don ƙarin bayani, duba Teburin Halayen Wutar Lantarki a cikin LM3477 Babban Haɓaka Babban Side N-Channel Controller don Canjawar Takardun Bayanai na Regulator. A cikin yanayin fitowar 3.3-V, wannan yana fassara zuwa ƙayyadaddun fitarwa voltage tsakanin 3.27 V da 3.43 V. Ma'anar maƙasudin yanayin hysteretic aiki ne na RSN da RSL. Hoto 3-1 yana nuna madaidaicin kofa da VIN don kwamitin kimantawa na LM3477 tare da kuma ba tare da RSL ba.
Ƙara Ƙimar Yanzu
- RSL resistor yana ba da sassauci wajen zabar ramp na ramuwa gangara. Rayya ta gangara tana rinjayar mafi ƙarancin inductance don kwanciyar hankali (duba sashin Raɗaɗin gangara a cikin LM3477 Babban Haɓaka Babban Side N-Channel Controller don Canjawar Bayanan Bayanan Mai Gudanarwa), amma kuma yana taimakawa ƙayyade iyaka na yanzu da madaidaicin madaidaicin. A matsayin exampLe, RSL za a iya cire haɗin kuma a maye gurbinsa da 0-Ω resistor ta yadda ba a ƙara ƙarin diyya zuwa ga yanayin motsin hankali na yanzu don ƙara iyaka na yanzu. Hanya mafi al'ada don daidaita iyaka na yanzu shine canza RSN. Ana amfani da RSL anan don canza ƙayyadaddun ƙayyadaddun halin yanzu saboda sauƙi da kuma nuna dogaro da iyaka na yanzu zuwa RSL. Ta canza RSL zuwa 0 Ω, ana iya cika waɗannan sharuɗɗan:
- 4.5V ≤ VIN ≤ 15 V
- VUT = 3.3 V
- 0 A ≤ GASKIYA ≤ 3 A
- Ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ayyuka ne na ramuwa mai gangara da kuma aiki mai ƙarfi na mai tsayayyar hankali. Ta hanyar rage RSL, raguwar ramuwa ta ragu, kuma a sakamakon haka iyakar halin yanzu yana ƙaruwa. Hakanan madaidaicin yanayin yanayin zafi zai ƙaru zuwa kusan 1 A (duba Hoto 3-1).
- Hoto na 4-1 yana nuna faifan bode na LM3477 buɗaɗɗen amsa mitar madauki ta amfani da abubuwan da aka gyara (RSL = 0 Ω) don cimma ƙarfin fitarwa na yanzu.
Mahimman Matsala
Za'a iya aiwatar da kyakkyawan tsari don masu canza DC-DC ta bin wasu ƙa'idodin ƙira masu sauƙi:1. Sanya abubuwan wutan lantarki (catch diode, inductor, da filter capacitors) kusa da juna. Ka sanya alamomin da ke tsakanin su gajeru.
- Yi amfani da lambobi masu faɗi tsakanin abubuwan wutar lantarki da haɗin wutar lantarki zuwa da'irar mai canza DC-DC.
- Haɗa fitilun ƙasa na shigarwar da fitarwa na tace capacitors kuma kama diode kusa da yuwuwar ta amfani da karimci-gefen jan ƙarfe cika azaman jirgin sama na ƙasa. Sa'an nan, haɗa wannan zuwa jirgin sama na ƙasa tare da hanyoyi da yawa.
- Shirya abubuwan haɗin wutar lantarki ta yadda madaukai masu sauyawa na yanzu curl a hanya guda.
- Hanyar babban mitoci da dawowar ƙasa azaman hanyoyin layi ɗaya masu ci gaba da kai tsaye.
- Rarrabe alamomin amo, kamar voltage hanyar mayar da martani, daga alamun hayaniya masu alaƙa da abubuwan wutar lantarki.
- Tabbatar da kyakkyawan ƙasa mai ƙarancin ƙarfi don mai sauya IC.
- Sanya abubuwan da ke goyan bayan IC mai juyawa, kamar ramuwa, zaɓin mita da abubuwan caji-pump, kusa da mai sauya IC gwargwadon yuwuwar amma nesa da alamun hayaniya da abubuwan wutar lantarki. Yi haɗin haɗin su zuwa IC mai juyawa da jirgin saman sa na ƙasa a takaice gwargwadon yiwuwa.
- Sanya da'irori mai saurin amo, kamar tubalan rediyo-modem IF, nesa da mai sauya DC-DC, tubalan dijital na CMOS, da sauran kewayar hayaniya.
Tarihin Bita
NOTE: Lambobin shafi don sake dubawa na baya na iya bambanta da lambobin shafi a sigar yanzu.
Canje-canje daga Bita E (Afrilu 2013) zuwa Gyaran F (Fabrairu 2022)
- An sabunta tsarin ƙididdigewa don tebur, ƙididdiga, da maƙasudin giciye cikin takaddar. …………… .2
- An sabunta taken jagorar mai amfani da aka sabunta……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
MUHIMMAN SANARWA DA RA'AYI
- TI YA BADA BAYANIN FASAHA DA DOMIN AMINCI (HADA DA RUBUTUN DATA), KYAUTATA ARZIKI (HADA DA SIFFOFIN NASARA), APPLICATION KO SAURAN SHAWARAR TSIRA, WEB KAYAN NAN, BAYANIN TSIRA, DA SAURAN ASABAR “KAMAR YADDA YAKE” KUMA TARE DA DUKKAN LAIFI, DA KUMA KYAUTA DUK GARANTI, BAYANI DA BAYANI, BA TARE DA IYAKA KOWANE GARANTIN CIN ARZIKI BA, DOGARO LISSAFI. HAKKIN DUKIYAR ARTY .
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- Babu lasisi da aka bayar ga kowane haƙƙin mallakar fasaha na TI ko ga kowane haƙƙin mallakar fasaha na ɓangare na uku. TI yayi watsi da alhakin, kuma za ku ci gaba da ladabtar da TI da wakilansa a kan, duk wani iƙirari, diyya, farashi, asara, da kuma abin da kuka samu ta amfani da waɗannan albarkatun.
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- TI ya ƙi kuma ya ƙi kowane ƙarin ko wasu sharuɗɗan da ƙila ka gabatar.
MUHIMMAN SANARWA
- Adireshin aikawa: Texas Instruments, Akwatin gidan waya 655303, Dallas, Texas 75265
- Haƙƙin mallaka © 2022, Texas Instruments Incorporated
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