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APEC: TI amaganiza mochedwa kuti ap-chip chip ndi 15mW kuyima

TI-TPS7A78-ac-dc

"Chipangizochi chimapangitsa kuti zinthu zikhale bwino kwambiri komanso kuti phokoso likhale lopanda phokoso pang'onopang'ono.

Amatchedwa TPS7A78, ndipamwamba kwambiri pamatenga zaka makumi khumi zapitazo, zomwe zimagwiritsa ntchito mndandanda wa impenseni ya capac capacitor ('Cs' mu nkhaniyi) pafupipafupi kuti 'amasulire' magetsi ambiri popanda mphamvu yowononga mphamvu (pa mtengo wa chinthu chosautsa mphamvu).

Malinga ndi lingaliro lokale, limapangitsa kuti ntchitoyi ikhale yoyenerera komanso imapangitsanso malamulo omwe amachititsa kuti mafailoni amatha kugwira ntchito kumapeto kwa mapepala - kudzaza reservoir capacitor (Cscin), yomwe imapatsa 4: 1 switched capacitor vol-step-down-to step-up zotuluka pakali pano. Pa chigamulocho ndi chikhalidwe cha LDO chotsatira.


TI-TPS7A78-ac-dc-block"Kuchitapo kanthu kwa Cs kumapereka mphamvu yothamanga ya AC yomwe ikugwiritsidwa ntchito kulipira kukonza kwa AC voltage capacitator [Cscin]", adatero. "4: 1 kusinthana masewera otchinga amakhala ndi zotsatira zowonjezera pakalipano patsiku la 1 / 4th. Kupikisana kwapachilendo [Rs] kumagwiritsidwa ntchito kuchepetsa kuthamangira panopa ku chipangizo. Rs imagwiritsidwanso ntchito kuteteza chipangizocho kuti chisachoke m'mafunde pamodzi ndi TVS [mpweya wothamanga] kapena MOV [metal-oxide varistor]. "

Zonsezi ndizo:

Pogwiritsa ntchito mankhwalawa pakati pa 3.4V ndi 5V, chowongolera chogwirira ntchito chimayang'aniridwa kuti chikhale ndi kumira kwa 600mV ku LDO (pa zonse ziwiri ndi kutentha) kuti kuchepetsa kutaya kwake kwa mphamvu - kotero ngati chiwongolerocho chaperekedwa ku 4V, wothandizira amaonetsetsa kuti 4.6V ndi yosungidwa pa gombe / kulowetsa LDO.

Pogwiritsa ntchito malonda omwe amakhalapo pakati pa 3.4V ndi 1.25V, wokonzanso ntchitoyo amakhala ndi 4V yosungirako.

Ngati pulogalamu yowonjezera (> 5.75V) imapezeka pa zotsatira - katundu wolemera amachotsedwa mwadzidzidzi kuchokera ku chiwongoladzanja, mwachitsanzo - chitetezo cha dera chimasiya gawo la switched-capacitor mpaka kuwonjezera pa LDO input capacitor. Izi zikhoza kuchitapo kanthu pamene zotsatirazo zakhazikitsidwa ku 5V - chigawo cha 5.75V chiri pafupi ndi 5.6V kuti woyimitsa wobwezeretsa adzakhala akusunga pa kuika kwa LDO.

Ngati ac siilipo, pali njira yopezera mphamvu kuchokera ku chitsimikizo cha dc kupita ku reservoir capacitor kugwirizanitsa pang'onopang'ono - onetsetsani pepala la deta pamagulu angapo ozungulira njirayi - imodzi mwa izi ndi yakuti izi zingagwiritsidwe ntchito ndi zotsatira zochokera pamwamba mpaka 3.3V.

Kuchokera kwachidule kwapadera kumaperekedwa, kumathandizidwa ndi kutetezedwa kwazitenthesi kumapitirirabe.

Kuti phindu la mirocontroller likugwiritsidwa ntchito ndi chip, zipilala ziwiri zowonjezera zilipo: Mphamvu-kulephera ndi pini yotsegula yomwe imasonyeza mphamvu yowonjezera ya AC ikugwa. Mphamvu-zabwino ndi pinini yotseguka yomwe imasonyeza kuti zotsatira zake zatuluka pamwamba pa 92% ya mtengo wake wokhala ndi (2% hysteresis ikagwa).

Potsatira kutentha kwamtundu, zotsatira zake zimabwereranso nthawi yomweyo chipangizocho chimatha mokwanira.

Zomwe mazimum voltages ali nazo ndi 30V pamagetsi, ndi 30V pazitsulo - ngakhale zowonjezera zimagwa mpaka 24V pamene zimayendetsedwa ndi dc. Kufikira 3A amaloledwa mwachidule kuchokera ku zotsatira za ac kuti agwire. Max zotuluka ndi 120mA mu-mlatho wathunthu, 60mA pakati.

Njira imodzi yomwe mungagwiritsire ntchito ndikuthandizira mamita abwino, kumene, malinga ndi TI, "mosiyana ndi njira zamagetsi a AC mpaka DC, TPS7A78 sichifuna magneti akunja omwe amachititsa kuti ikhale yabwino kwambiri pamapulogalamu a e-metering pakupangitsa kuti izi zisawonongeke. Zimakwaniritsa ndondomeko ya IEC 61000-4-8 yofunikira ndi ntchito monga magetsi. "

Cholemba cha pulogalamu, 'Cap imataya osagwiritsa ntchito ma e-mamita', Lilipo lomwe likufotokoza dera limene limapereka 3.3V (50mA kuchepa) kuchokera 90 - 265Vac. Kuchita bwino ndi 53% pa ​​120Vac mu 50mA kunja.

Zitha kuthandizanso kukwaniritsa mphamvu zamagetsi pogwiritsa ntchito TPS7A78, werengani nkhani yachidule, "Momwe mungapangire mphamvu yowonjezera ya AC / DC yosagonjetsa." "

TPS7A78 imabwera mu 14pin, 5 x 6.5mm TSSOP.