Ugereranije na LDO, umuzenguruko wa DC-DC uraruhije cyane kandi urusaku, kandi imiterere n'ibisabwa biri hejuru. Ubwiza bwimiterere bugira ingaruka ku mikorere ya DC-DC, ni ngombwa rero gusobanukirwa imiterere ya DC-DC

1. Imiterere mibi
● EMI, DC-DC SW pin izaba ifite dv / dt yo hejuru, ugereranije dv / dt izatera EMI nini cyane;
Noise Urusaku rw'ubutaka, umurongo w'ubutaka ntabwo ari mwiza, bizatanga urusaku runini rwo guhinduranya ku nsinga y'ubutaka, kandi urusaku ruzagira ingaruka ku bindi bice by'umuzunguruko;
Drop Umuvuduko wa voltage ukorwa kuri wiring. Niba insinga ari ndende cyane, igitonyanga cya voltage kizabyara kuri wiring, kandi imikorere ya DC-DC yose izagabanuka.

2. Amahame rusange
Hindura inzitizi nini zigezweho mugihe gito gishoboka;
Ground Ikimenyetso cyubutaka hamwe nubutaka bugezweho (imbaraga zubutaka) bigenda bitandukanye kandi bigahuzwa mumwanya umwe kuri chip GND

OrtGuhindura inzira
LOOP1 itukura ku gishushanyo gikurikira nicyerekezo cyogutemba mugihe DC-DC umuyoboro muremure wo hejuru urimo kandi umuyoboro wo hasi urazimye. Icyatsi LOOP2 nicyerekezo kigezweho mugihe umuyoboro muremure wo hejuru ufunze kandi umuyoboro wo hasi urakingurwa;

Kugirango ukore ibice bibiri bito bishoboka kandi utangire kutivanga, amahame akurikira agomba gukurikizwa:

Induction hafi ya SW pin ishoboka;
Kwinjiza ubushobozi hafi ya VIN pin bishoboka;
Ubutaka bwinjiza nibisohoka bigomba kuba hafi ya pin ya PGND.
● Koresha uburyo bwo gushyira insinga z'umuringa;

Kuki wabikora?

Nibyiza cyane kandi birebire cyane umurongo bizongera impedance, kandi umuyoboro munini uzatanga ingufu zingana zingana na voltage muri iyi mbogamizi nini;
● Nibyiza cyane kandi birebire cyane insinga izongera inductance ya parasitike, kandi urusaku rwo guhuza urusaku kuri inductance bizagira ingaruka kumitekerereze ya DC-DC kandi bitera ibibazo bya EMI.
Cap Ubushobozi bwa parasitike na impedance bizongera igihombo cyo guhinduranya no gutakaza-on-off kandi bigira ingaruka kumikorere ya DC-DC

Ingingo imwe
Guhuza ingingo imwe bivuga ingingo imwe ihagarara hagati yubutaka bwubutaka nubutaka. Hazaba urusaku runini rwo guhinduranya ku butaka bw'amashanyarazi, birakenewe rero kwirinda gutera intambamyi ku bimenyetso bito byoroshye, nka FB itanga ibitekerezo.

Land Ubutaka-bugezweho: L, Cin, Cout, Cboot ihuza umuyoboro wubutaka bugezweho;
Ground Ubutaka bugezweho: Css, Rfb1, Rfb2 bihujwe ukundi guhuza ibimenyetso byubutaka;

Ibikurikira nuburyo imiterere yinama yiterambere ya TI. Umutuku ninzira igezweho iyo umuyoboro wo hejuru ufunguye, naho ubururu ninzira igezweho iyo umuyoboro wo hasi ufunguye. Imiterere ikurikira ifite ibyiza bikurikira:

GND yo kwinjiza no gusohora ubushobozi bwahujwe n'umuringa. Mugihe ushyira ibice, ubutaka bwibiri bugomba gushyirwa hamwe hashoboka.
Inzira igezweho ya Dc-Dc-ton na Toff ni ngufi cyane;
Signal Ikimenyetso gito iburyo ni icyerekezo kimwe, kikaba kiri kure yingaruka zurusaku runini ruhindura ibumoso;

3. Ingero

Imiterere yumuzingi usanzwe DC-DC BUCK yatanzwe hepfo, naho ingingo zikurikira zitangwa muri SPEC:
Kwinjiza ubushobozi, imiyoboro ihanitse ya MOS, na diode ikora guhinduranya ibintu bito kandi bigufi bishoboka;
Kwinjiza ubushobozi hafi ya Vin Pin pin;
● Menya neza ko ibitekerezo byose bihuza ari bigufi kandi bitaziguye, kandi ko abarwanya ibitekerezo hamwe nibintu byindishyi byegereye chip bishoboka;
● SW kure y'ibimenyetso byoroshye nka FB;
● Huza VIN, SW, na cyane cyane GND ukwayo ahantu hanini h'umuringa kugirango ukonje chip kandi utezimbere imikorere yubushyuhe hamwe nigihe kirekire cyo kwizerwa;

4. Vuga muri make

imiterere yumuzunguruko wa DC-DC ningirakamaro cyane, bigira ingaruka itaziguye kumikorere no mumikorere ya DC-DC. Mubisanzwe, SPEC ya DC-DC chip izatanga imiterere yubuyobozi, ishobora koherezwa kubishushanyo mbonera.