LM317 adjustable tam sim no regulator

Peb-davhlau ya nyob twg adjustable regulator LM317 muab tam sim no load ntawm 100 ma. tso zis voltage ntau yog 1.2 rau 37 V. Tus ntaus ntawv yog heev yooj yim mus siv thiab yuav tsum tau tsuas yog ib lub khub ntawm sab nraud resistors uas muab cov zis voltage. Plus, lub khov ntawm cov ua hauj lwm tsis muaj kev zoo dua qub tshaj piv qauv nrog ib taag mov voltage ntawm cov qhov tso zis.

piav qhia

LM317 - voltage thiab tam sim no stabilizer uas tso cai txawm tias thaum kaw tswj pin ADJ. Nyob rau hauv lag luam, tus ntaus tsis yuav tsum tau kev cob cog rua rau lub ntxiv capacitor. Tsuas yog ib tug no yog ua thaum lub ntaus ntawv yog nyob ib tug txiav txim deb los ntawm tus thawj hwj chim mov lim. Nyob rau hauv cov ntaub ntawv no, qhov yuav tsum tau installation ntawm lub tswv yim bypass capacitor.

Tso zis hauv lub analogue tso cai los txhim kho cov kev kawm tam sim no regulator LM317. Raws li ib tug tshwm sim, ntau zog khov thiab tsis kav ntev ripple nqi ntawm cov smoothing coefficient. Xws li ib tug pom daim duab tsis yooj yim mus cuag nyob rau hauv lwm yam peb-davhlau ya nyob twg analogues.

Lub hom phiaj ntawm lub ntaus ntawv nyob rau hauv saib xyuas yog tsis tsuas cov kev hloov ntawm stabilizers nrog taag tso zis qhov taw qhia, tab sis rau ib tug ntau ntawm cov ntaub ntawv sau npe. Piv txwv li, LM317 tam sim no regulator yuav siv tau nrog high-power circuits. Nyob rau hauv no system ib tug neeg xauj tsev influences qhov txawv ntawm lub tswv yim thiab tso zis voltage. Lag luam ntawm lub ntaus ntawv nyob rau hauv no hom yuav ntxiv indefinitely, kom txog thaum lub sib txawv nruab nrab ntawm ob nqi (lub tswv yim thiab tso zis voltage) tsis pub tshaj lub siab tshaj plaws pub point.

nta

Nws yog ib nqi sau cia hais tias lub LM317 tam sim no regulator yog haum rau tej yam yooj yim adjustable mem tes ntsuas. Lawv yuav siv tau raws li ib tug precision stabilizer, siv taag resistor nruab nrab ntawm ob outputs.

Tsim ib theem mov qhov chaw khiav hauj lwm rau uas tsis yog-check luv luv-circuits, ua tau los ntawm optimizing cov voltage qhia rau cov tswj system tso zis. Qhov kev pab cuam yuav nws nyob rau hauv lub nkag mus rau lub ntau yam ntawm 1.2 volts, rau feem ntau ntawm load yog heev me me. Thiab tam sim no regulator LM317 voltage transistor yog ua nyob rau hauv ib tug txheej txheem TO-cev pob txha 92 hom ntawm kev khiav hauj lwm kub xws li los ntawm -25 mus +125 degrees Celsius.

yam ntxwv ntawm

Saib ntsuas txig haum rau tus tsim ntawm tej yam yooj yim blocks thiab tswj khoom siv fais fab. Cov tsis tau muab teev thiab kho nyob rau hauv cov nqe lus ntawm lub load.

Thaum uas tig kauj tam sim no nyob rau hauv lub stabilizer LM317 muaj cov nram qab cov yam ntxwv:

• Tso zis voltage ntau yam - los ntawm 1.2 mus 37 volts.
• Lub load tam sim no rau lub siab tshaj plaws - 1.5 A.
• Muaj yog ib tug tiv thaiv tawm tsam luv luv circuits.
• Muaj fuse Circuit Court los ntawm overheating.
• Cov kev ua yuam kev nyob rau hauv lub qhov zis voltage yog tsis ntau tshaj li 0.1%.
• Lub tsev nyob IC nti - lub hom TO-220, TO-3 los yog D2PAK.

Tsav tam sim no stabilizer rau LM317

Raws li feem ntau raws li lub ntaus ntawv nyob rau hauv lo lus nug no yog siv nyob rau hauv LED khoom siv fais fab. Ntxiv nws pib ib tug yooj yim Circuit Court nyob rau hauv uas lub resistor thiab lub nti yog tshuab txais.

Thaum lub tswv yim hwj chim qhov twg los voltage yog nkag, thiab tiv tauj lub ntsiab yog kev cob cog rua rau lub analog zis siv cov resistor. Ntxiv mus, aggregation muaj tshwm sim nrog cov anode ntawm lub LED. Cov feem nrov tam sim no Circuit Court LM317 stabilizer raws li hais tias piav saum toj no, siv cov nram qab no mis: R = 1/25 / I. Qhov twg kuv - yog tus ntaus zis tam sim no, nws txoj kev khwv mas nws txawv ntawm 0, 01-1.5 A. Resistor tso cai nyob rau hauv ntau thiab tsawg pab 0, 8-120 ohms. Dissipated hwj chim resistor yog xam los ntawm cov mis: R = IxR (2).

Cov ntaub ntawv uas tau yog npawv. Taag resistors ua nrog ib tug me me kis kawg kuj. Qhov no muaj feem xyuam rau cov tau txais daim ntawv ntawm kev them nyiaj indicators. Yuav kom daws tau qhov teeb meem no, nyob rau hauv lub tswvyim, ib qho ntxiv stabilizing resistor yuav tsum tau lub hwj chim.

Pros thiab cons

Xyaum qhia tau hais tias lub lag luam hwj chim ntawm tus resistor yog zoo dua mus nce nyob rau hauv loj dispersion ntawm 30%, thiab nyob rau hauv uas tsis muaj convection compartment - ntawm 50%. Sib nrug los ntawm ib tug xov tooj ntawm zoo, LM317 LED tam sim no regulator muaj ib tug ob peb drawbacks. Cov lawv:

• Me efficiency.
• Qhov yuav tsum tau tshem tawm thaum tshav kub kub ntawm lub system.
• AC Stabilization tshaj 20% ntawm cov kev txwv tus nqi.

Txhob muaj teeb meem nyob rau hauv lub lag luam ntawm tus ntaus ntawv yuav siv switching regulators.

Nws yog ib nqi sau cia hais tias yog koj xav mus cuag ib tug high-power LED tsev muaj peev xwm ntawm 700 milliamps yuav tsum tau mus xam tus nqi ntawm cov mis mos: R = 1, 25/0, 7 = 1.78 ohms. Fais fab dissipation yuav feem 0, 88 watts.

kev twb kev txuas

Muab xam los LM317 tam sim no regulator raws li nyob rau hauv ob peb txoj kev twb kev txuas. Hauv qab no yog cov yooj yim schemes:

1. Yog hais tias koj siv ib lub hwj chim transistor hom Q1, koj yuav tau txais tsis muaj ib tug heatsink micro tso zis tam sim no ntawm 100 ma. Nws yog txaus kom tswj tau tus transistor. Raws li ib tug muaj kev ruaj ntseg net los ntawm ntau xwb D1 thiab D2 yog siv tiv thaiv diodes, thiab thaum uas tig mus electrolytic capacitor muaj nuj nqi rau txo lub suab nrov. Thaum uas siv cov transistor Q1, lub siab tshaj plaws tso zis muaj peev xwm ntaus 125 Watts.
2. Nyob rau hauv lwm tsim muaj tsawg tam sim no mov thiab ruaj khov lag luam ntawm LEDs. Tshwj xeeb tsav tsheb tso cai rau koj mus faiv fab tso lub ntsiab ntawm lub peev xwm ntawm 0, 2 watts mus 25 volts.
3. Nyob rau hauv lwm tsim thov voltage txos transformer los ntawm lub network nce mus nce los ntawm 220 watts mus 25 watts. Nrog kev pab los ntawm lub diode choj AC voltage yog hloov mus rau hauv ib tug mus tas kev ntsuas. Ntxiv mus, tag nrho cov faults yog smoothed vim lub capacitor C1 hom uas muab ruaj khov lag luam ntawm lub voltage regulator.
4. Cov nram qab no xov daim duab yog ib tug ntawm cov uas yooj yim. Lub voltage nkag los ntawm ob winding ntawm lub transformer ntawm 24 volts, yog rectified thaum dhau los ntawm lub lim thiab yog tau nyob rau hauv lub qab muab tus nqi tsis tu ncua 80 volts. Qhov no txhob tau siab tshaj lub siab tshaj plaws mov voltage chaw pib.

Nws yog ib nqi sau cia hais tias ib tug yooj yim roj teeb charger kuj tau sau rau lub hauv paus ntawm lub nti nyob rau hauv kev saib xyuas ntawm lub ntaus ntawv. Npaj los ntawm standard linear regulator nrog ib tug adjustable tso zis voltage qhia. Nyob rau hauv ib tug zoo xws li cov luag hauj lwm tej zaum yuav ua microassembly ntaus ntawv.

analogs

Haib stabilizer LM317 muaj ib tug xov tooj ntawm analogues nyob rau hauv lub domestic thiab txawv teb chaws ciaj uas muag. Lub nto moo tshaj plaws ntawm lawv yog cov nram qab no hom:

• Domestic kev hloov kho KR142 thiab KR115 EN12 EN1.
• GL317 qauv.
• Variations SG31 thiab SG317.
• UC317T.
• ECG1900.
• SP900.
• LM31MDT.

Xyuas

Raws li evidenced los ntawm tswv yim los ntawm cov neeg siv, qhov qhia regulator copes nrog nws zog. Tshwj xeeb tshaj yog thaum nws tawm los rau aggregation nrog LED hais, lub voltage rau 50 volts. Simplifies txij nkawm thiab cov lag luam ntawm lub twj paj nruag thiab tau kho cov kev twb kev txuas nyob rau hauv txawv schemes. Gripe rau cov khoom no yog muaj nyob rau hauv lub siab hais tias txoj kev khwv thiab mov voltage muab rau nws limited txwv kev cai.

Qhov kawg ntawm

Adjustable stabilizer ib hom LM317 yog zoo tagnrho rau cov tsim ntawm tej yam yooj yim khoom siv fais fab, xws li yam thiab spare qhov chaw rau hluav taws xob khoom, txawm peem rau nrog ib tug ntau yam ntawm cov zis tsis. Qhov no ntaus ntawv yuav tsum muaj ib tug predetermined tam sim no thiab voltage los yog ib tug tswj qhia yam ntxwv. Rau yooj yim ntawm kev xam, cov phau ntawv muaj ib tug tshwj xeeb lub tshuab xam zauv stabilizer tso cai rau koj los mus xaiv tus muaj txoj cai tswvyim thiab los mus txiav txim tau adapting.