150W MP3 Car Power Amplifier

Chithunzi cha block:
Apa, ndi chithunzi cha choimba mawu. LF353 ya, National Semiconductor, igawa mawu omvera m'magulu atatu. SANYO'S LA47536 ikulitsa izi. Mumayendedwe a stereo, tidzakhala ndi chochita ndi okwanira asanu ndi atatu omwe apanga mawu ofunikira kwambiri.

Njira zitatu Zogwiritsira Ntchito Matenda Ogwira Ntchito:

Kufotokozera:
LF353 Wide Bandwidth Dual JFET Input Operational Amplifier
Kufotokozera Kwambiri
Zipangizozi ndizotsika mtengo, kuthamanga kwambiri, maofesi amtundu wa JFET ophatikizira amagetsi awiri ogwiritsa ntchito zida zapamwamba zamagetsi za BI-FET II. Amafunikira kutsika kochepa pakali pano koma kukhalabe ndi zida zochulukirapo komanso zochedwa. Kuphatikiza apo, zida zoyenerera zamagetsi za JFET zochulukirapo zimapereka zochepa kwambiri pazowonjezera ndi mafunde olakwika. LF353 ndi pini yolumikizana ndi LM1558 yolola ojambula kuti azikonza nthawi yomweyo ntchito yonse yamapangidwe a LM1558 ndi LM358. Izi zikuluzikulu zitha kugwiritsidwa ntchito ngati ma processor othamanga, othamangitsira D / A osintha, mwachitsanzo ndikuzungulira mabwalo ndi zina zambiri zomwe zimafuna magetsi ocheperako, kuthamanga kwakanthawi pano, kuyika kwakukulu, kuthamangitsidwa kwakukulu. Zidazi zimawonetsanso phokoso lotsika komanso magetsi othamangitsidwa. (National Semiconductor)

Mawonekedwe :
Magetsi ochulukirapo omwe anakonzedwa: 10 mV
Zotsitsa zochepa pazomwe zilipo: 50pA
Voliyumu yaphokoso yamagalimoto: 25 nV
Phokoso lochepa lamakono: 0.01 pA
Kuchulukitsa kwakukulu: 4 MHz
Mulingo wapamwamba kwambiri: 13 V / us
Zowonjezera zochepa: 3.6 m
Kuletsa kwakukulu: 1012.
Kupotoza konsekonse kosavomerezeka: <0.02%
Kona ya phokoso la 1 / f: 50 Hz
Nthawi yokhazikika kukhazikika kwa 0.01%: 2 ife

Amplifier Yamphamvu:

Amplifier akaiyikanso kusutikesi, tifunika kuyimitsa ntchito. LA47536 ili ndi ntchito pomwepo. Pine uyu amafunikira zovuta zazing'ono kuposa 4V poyambira kukulitsa. Transistor Q2 ndi Q1 imapangitsa ntchito yoyenda kuyimilira patali. Dalaivala akatsogolera chizindikiro chakumanzere, kuyatsa moto wam'mbuyo kapena kukanikiza pa brake, nyali kumbuyo zimayatsa kuyendetsa Q2 yemwe adamupangitsanso kuyendetsa Q2 yemwe amagwiritsa ntchito kuvutikira> 1V pamenepo. Mwachidule

LA47536 Four-Channel 45 W BTL Car Audio Power Amplifier
LA47536 ndi njira yamagetsi yamagetsi ya 4T BTL ya IC-yopanga kuti igwiritsidwe ntchito mumayendedwe amawu. Zotsatira zake

- Kapangidwe koyera kogwiritsa ntchito V-PNP transistors mbali yayitali ndi ma NPN transistors mbali yotsika kuti apereke mphamvu zapamwamba komanso mawonekedwe apamwamba kwambiri.

- LA47536 imaphatikizapo ntchito zonse zofunika pakugwiritsira ntchito zomvetsera zamagalimoto, kuphatikiza kusintha kosinthika, ntchito yosinthira, ndi gawo lililonse loteteza. Zimaperekanso ntchito yodzipenda nokha (kuzindikira zomwe mwachita). (Sanyo)

Kufotokozera Kantchito
1. Yimani Pantchito Yantchito (pini 4)
Voliyumu yotsikira ya 4 ndiyoti ikhale 2 VBE. Vst ikakhala 2.0V kapena kupitilira, amplifier idzakhala itayamba, ndipo Vst, itakhala 0.7V kapena kutsika, amplifier imachoka. Dziwani kuti pini 4 ikufunika kuti pakhale pafupifupi 40uA.

2. Kusintha Ntchito
IC yakhazikitsidwa kukhala boma losinthika poyika pini 22 pazomwe zingatheke. M'dziko lino, zomvetsera zimasinthidwa. Nthawi yomwe ntchito yolumikizira imagwirira ntchito imakhazikitsidwa ndi gawo lakunja la RC, ndipo nthawi ino mosalekeza imayambitsa phokoso la pop lomwe limachitika pomwe amplifier imayimitsidwa kapena kuzimitsidwa.
Kusintha nthawi ndi nthawi chifukwa cha mfundo zakunja zomwe zaperekedwa (R = 10k, C = 3.3uF) ndi izi:
Kusintha nthawi: 50ms
Kusintha nthawi: 20ms

3. Kudzizindikira Ntchito (kupewa kuyipa kwa Spika
Pogwira ntchito mokhazikika, LA47536 imazindikira, mkati mwake, ngati sizinachitike kapena sizinachitike, ndipo zikutulutsa chizindikirocho kuchokera pa pini 25. Mapulogalamuwa amatha kupewa kutopa kwa wokamba ndi mavuto ena mwa kuti makina a microcontroller azindikire chizindikiro ichi cha 25. kuwongolera mwina dziko loyimirira kapena magetsi. (Kutulutsa kwina koyipa kungayambitsidwe, mwachitsanzo, kulowetsamo capacitor kotayikira.) Chizindikiro cha pini 25 chimazimitsidwa mwa kukhazikitsa pini 1 mpaka kuthekera kwa nthaka.

4. Oscillator Kukhazikika
Nthawi zina, oscillations parasitic amatha kukhala chifukwa cha PCB. Oscillation iyi imathetsedwa powonjezera zinthu zomwe zidafotokozedwera. Zindikirani kuti mulingo woyenera wa capacitor uyenera kutsimikiziridwa ndikuyesa mkhalidwe womwe uli pamapeto. Lumikizani capacitor ndi resistor (0.1uF ndi 2.2) mndandanda pakati pa cholembera chilichonse ndi nthaka.

5. Audio Quality (Low gulu)
Makhalidwe a pafupipafupi mumayendedwe otsika amatha kuwongoleredwa ndikupanga kutulutsa mphamvu kwa mawonekedwe a capacitor kutembenuka. Mphamvu yolimbikitsidwa ndi 2.2uF komanso yaying'ono.

6. Mabwalo Oteteza
Osatulutsa zotuluka ndi STBY voliyumu pafupi 1.4V. Komanso, musayimitse IC kukhala malo oyika ndi nthawi yoperekedwa ndi voliyumu ya STBY.

7. Pop Phokoso
Ngakhale LA47536 imaphatikizaponso dera loletsa phokoso lapa pop, phokoso la pop litha kuchepetsedwa kwambiri pogwiritsa ntchito ntchito yosinthira masinthidwe. Yambitsani ntchito yosinthira nthawi yomweyo mphamvu itayikidwa. Kenako, kutulutsa kwina kwa DC kukakhala kokhazikika, kuyimitsa ntchito yosinthaku. Mukamayimitsa mphamvu, choyamba yambitsani ntchito yosinthira kenako ndikuzimitsa magetsi. Njira ziwiri izi zikuthandizira kuchepetsa phokoso la pop.

Magulu Omasulira Omasulira: