LM317 Tam Sim No Boosting Secrets!: 4 Kauj Ruam

2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:25

Abstract

LM317 yog ib qho ntawm cov neeg nyiam tshaj plaws tuaj yeem hloov kho tus lej. Cov zis hluav taws xob ntawm tus tswj hwm tuaj yeem hloov kho los ntawm 1.25V txog 35V. Txawm li cas los xij, nti tuaj yeem xa cov dej ntws mus txog 1.5A uas tsis txaus rau qee qhov kev siv fais fab. Hauv kab lus no, Kuv yuav tham txog ob txoj hauv kev ntawm LM317 kev txhawb nqa tam sim no, siv lub zog PNP thiab NPN hla transistors.

[A] Kev Txheeb Xyuas Circuit

Raws li LM317 cov ntaub ntawv: "LM317 [1, 2] cov cuab yeej yog kho tau peb lub davhlau ya nyob twg qhov ntsuas hluav taws xob muaj peev xwm muab ntau dua 1.5 A tshaj qhov tso tawm qhov hluav taws xob ntau ntawm 1.25 V txog 37 V. Nws xav tau tsuas yog ob sab nraud resistors los teeb cov zis hluav taws xob. Cov cuab yeej muaj cov kab kev coj ua raug cai ntawm 0.01% thiab kev tswj hwm ib txwm muaj ntawm 0.1%. Nws suav nrog kev txwv tam sim no, kev tiv thaiv kom sov ntau dhau, thiab kev tiv thaiv thaj chaw nyab xeeb. Kev tiv thaiv ntau dhau tseem ua haujlwm tau txawm tias ADJUST lub davhlau ya nyob twg raug txiav tawm. " Cov ntaub ntawv no ua pov thawj rau peb tias cov cuab yeej pheej yig 3-dav hlau no haum rau ntau daim ntawv thov tab sis nws los nrog qhov tsis zoo rau kev siv fais fab thiab qhov ntawd yog kev txwv ntawm tus tswj hwm qhov tso tawm tam sim no tuav (1.5A hauv qhov xwm txheej zoo tshaj). Qhov teeb meem no tuaj yeem daws tau siv lub zog transistor dhau.

[A-1] Tam sim no Boosting Siv PNP Power Transistor (MJ2955)

Daim duab-1 qhia txog daim duab qhia kev ntawm Circuit. Qhov no yog qhov hloov pauv siab tam sim no tus tswj hwm Circuit Court uas qhov hluav taws xob tso tawm tuaj yeem hloov kho siv 5K potentiometer.

Kauj Ruam 1: Daim duab 1: LM317 Tam Sim No Boosting Circuit Siv MJ2955

10R resistor piav qhia Lub Sijhawm Qhib Sijhawm ntawm trans-transistor thiab los ntawm txoj kev, nws piav qhia ntau npaum li cas tam sim no yuav tsum hla dhau LM317 thiab MJ2955 [3, 4]. Raws li qhov ntsuas no, yuav tsum xam lub zog ntawm tus tiv thaiv kab mob. 1N4007 yog tus tiv thaiv diode thiab 270R resistor muab qhov tsim nyog ADJ tus pin tus tam sim no. Raws li tau hais ua ntej, 5K lub hwj chim ntsuas lub zog tso tawm. 1000uF, 10uF, thiab 100nF capacitors tau siv los txo cov suab nrov. Tsis txhob hnov qab teeb tsa lub transistor ntawm lub rhaub dej loj.

[A-2] Tam sim no Boosting Siv NPN Power Transistor (2N3055)

Daim duab-2 qhia txog daim duab qhia kev ntawm lub Circuit Court. Lub 10K resistor ntawm cov zis rub me me ntawm qhov tam sim no kom tsis txhob ntab tso zis thiab nws pab tswj kev tso zis hluav taws xob. Ntawm no 2N3055 [5, 6] ua lub luag haujlwm ntawm trans-transistor thiab.

Kauj Ruam 2: Daim Duab 2: LM317 Tam Sim No Boosting Circuit Siv 2N3055

[B] PCB Board

Cov duab kab kos yog yooj yim, yog li kuv txiav txim siab los siv lawv ntawm pawg thawj coj saib kev sim thiab ntsuas kev ua haujlwm. Kuv txiav txim siab sim daim duab 1 (MJ2955 txhawb nqa). Nws tau pom nyob hauv daim duab 3. Yog tias koj xav tsim tus txheej txheem PCB sai rau cov lej, koj tuaj yeem siv SamacSys cov tsev qiv ntawv pub dawb uas ua raws cov qauv IPC hneev taw. Txhawm rau teeb tsa lub tsev qiv ntawv, koj tuaj yeem rub tawm manually/teeb tsa lub tsev qiv ntawv, lossis ncaj qha nruab lawv siv qhov muab CAD plugins [7]. Muaj qhov kev xaiv yuav/sib piv tus nqi ntawm cov khoom qub los ntawm cov neeg tso cai faib khoom ib yam.

Kauj Ruam 3: Daim Duab 3: Txhim Kho Kev Siv Hluav Taws Xob Siv MJ2955

[C] Kev Ntsuas thiab Kev Ntsuas Koj tuaj yeem saib cov txheej txheem ntsuas tiav hauv cov vis dis aus, txawm li cas los xij, kuv kuj tso lub oscilloscope ntes cov duab los ntawm cov khoom siv hauv Circuit Court. Kuv siv Siglent SDS1104X-E oscilloscope uas muaj lub suab qis zoo nyob rau hauv qhov kawg. Kuv npaj los ntsuas qhov ua tau ripple ntawm lub Circuit Court. Daim duab 4 qhia txog lub suab nrov/ripple ntawm MJ2955 kev txhawb zog tam sim no. Lub Circuit Court tau tsim nyob rau ntawm pawg thawj coj saib thiab lub oscilloscope qhov kev sojntsuam hauv av tau ua los ntawm cov hlau lead hauv av, yog li cov suab nrov nrov no yog qhov ib txwm muaj. Yog tias koj npaj yuav siv ib qho ntawm ob qhov kev sib tw no, tsim kom muaj PCB zoo rau nws, tom qab ntawd hloov qhov kev sojntsuam hauv av nrog lub caij nplooj ntoo hlav hauv av, tom qab ntawd koj tuaj yeem rov tshuaj xyuas cov suab nrov.

Kauj Ruam 4: Daim duab 4: Oscilloscope Capture Los Ntawm Tam Sim No Tso Tawm (nyeem Cov Ntawv)

Cov neeg ua tim khawv

Kab lus:

[1]: LM317 Cov Ntawv Teev Npe:

[2]: LM317 Lub Tsev Qiv Ntawv:

[3]: MJ2955 Datashet:

[4]: MJ2955 Lub Tsev Qiv Ntawv:

[5]: 2N3055 Datahseet:

[6]: 2N3055 Lub Tsev Qiv Ntawv:

[7]: CAD Plugins: