LP87524BRNFRQ1 VQFN-HR26 Zvikamu Zvitsva Yekutanga Yakaedzwa Yakabatanidzwa Circuit Chip IC LP87524BRNFRQ1

1.

Basa rekushandura

A converter mudziyo unoshandura chiratidzo kuita chimwe chiratidzo.Chiratidzo chimiro kana mutakuri weruzivo rwuripo, uye mune otomatiki chiridzwa midziyo uye otomatiki kudzora masisitimu, chiratidzo chinowanzo shandurwa kuita chimwe chiratidzo chinofananidzwa nechiyero kana huwandu hwereferenzi kubatanidza mhando mbiri dzezviridzwa pamwechete, saka iyo converter inowanzova chinongedzo chepakati pakati pezviridzwa zviviri (kana zvishandiso).

2.

Maitiro ekuita mabhaki converters anoshanda

A buck converter is switch mode power supply, kirasi yechishandiso ine switch (kazhinji MOSFET) kukurumidza kushandura dunhu nekudzima, uku kukurumidza kuchinjika kunoburitsa square wave, kana basa rekutenderera rekuchinja rakaiswa kuti riite. 50%, kureva switch iri pa50% yenguva, avhareji voltage ichava 50% yekupinza.

Iyo square wave inoda kukwenenzverwa kuti ipe simba rinobatsira uye kazhinji inductors uye capacitors anoshandiswa munhevedzano kuita basa iri.Uku kusanganiswa kunozivikanwa seLC yakaderera-pass sefa, uko maitiro einductor anotsvedzerera kunze kwazvino uye capacitor inoramba shanduko kamwe kamwe mumagetsi.Iyo yakasanganiswa mhedzisiro inoburitsa yakapfava voltage inobuda ine yakaderera ripple.Semuenzaniso, kana magetsi ekuisa ari 10V uye switch inoshandisa 50% basa kutenderera, iyo inobuda voltage ichava 5V.

Chimwe chikamu chinodiwa cheshanduro yebhaki diode kana imwe switch yakabatana mukuwirirana neinductor.Izvi ndezvekubhadhara basa reinductor, apo ikozvino mune inductor haigoni kuchinjwa pakarepo, kudzivirira machubhu ekushandura kubva pakukuvadzwa nekuwedzerwa.

Iyo buck inoshandura zvakare ine yakawedzera maseketi kuti ive yakagadzikana yakabuda voltage.Iyo inoshandura inoshandisa yakavharwa-loop control scheme ine yakaipa mhinduro yekutarisa kubuda kwevoltage uye zvine simba kugadzirisa kutenderera kwebasa rema switch kuti agadzirise kubuda kwemagetsi.

3.

Dhizaini kufunga kune mabhadha converters

Buck converters inoshanda zvakanyanya, nemimwe michina inobudirira inodarika 95%.

Buck converters inodhura-inoshanda kupfuura mitsara yemagetsi pamazinga emagetsi akakwira, uko mutengo wekutonhora weiyo linear regulator ungave wakaderera pane mutengo wekushandisa buck converter.

iyo inobuda yebhaki inoshandura ine ruzha, zvinoreva kuti kubuda kweiyo linear regulator yakagadzikana uye inokodzera zvirinani kumaapplication anoda ruzha rwakadzika.

linear regulators vanogona kupindura nekukurumidza kune yekupinza uye kubuda shanduko kana ichienzaniswa neinoshandura buck.