Texas Instruments LM3477 Buck Controller Evaluation Module

Zambiri Zamalonda

LM3477 Buck Controller Evaluation Module ndi mawonekedwe apano, owongolera a N channel FET apamwamba. Amagwiritsidwa ntchito kwambiri popanga tonde.
LM3477 imalola zolowetsa zosiyanasiyana, zotulutsa, ndi katundu.
Avaluation board amabwera okonzeka kugwira ntchito ndi zinthu zinazake.

Malangizo Ogwiritsira Ntchito Zogulitsa

1. Onetsetsani kuti zigawo za mphamvu (catch diode, inductor, ndi fyuluta capacitor) zayikidwa pafupi ndi dongosolo la PCB. Pangani zotsalira pakati pawo zazifupi.
2. Gwiritsani ntchito kutsata kwakukulu pakati pa zida zamagetsi ndi kulumikizana ndi magetsi kudera losinthira la DC-DC.
3. Lumikizani zikhomo zapansi za zolowetsa ndi zotulutsa zosefera ndikugwira diode moyandikira momwe mungathere pogwiritsa ntchito njira zoyenera zosinthira.

Bill of Zipangizo (BOM)

Chigawo	Mtengo	Gawo Nambala
CIN1	Mtengo wa 594D127X0020R2	Ayi, gwirizanitsani
CIN2	Ayi, gwirizanitsani	Ayi, gwirizanitsani
COUT1	LMK432BJ226MM (Taiyo Yuden)	LMK432BJ226MM (Taiyo Yuden)
COUT2	DO3316P-103 (Coilcraft)	1.8k ndi
L	CRCW08051821FRT1 (Vitramon)	12 nF/50 V
RC	Zithunzi za VJ0805Y123KXAAT	Ayi, gwirizanitsani
CC1	5 ndi 30v	IRLMS2002 (IRF)
CC2	100 V, 3 A	MBRS340T3 (Motorola)
Q1	20	Mtengo wa CRCW080520R0FRT1
D	1k ndi	CRCW08051001FRT1 (Vitramon)
RDR	16.2k ndi	CRCW08051622FRT1 (Vitramon)
RSL	10.0k ndi	CRCW08051002FRT1 (Vitramon)
Mtengo wa RFB1	470 pf	Zithunzi za VJ0805Y471KXAAT
Mtengo wa RFB2	0.03	Ayi, gwirizanitsani

Kachitidwe

Kuchita bwino vs kulemedwa ndi magwiridwe antchito vs ma graph a VIN akuwonetsedwa mu bukhu la ogwiritsa ntchito kuti afotokozere.

Kamangidwe Zikhazikiko

Pa masanjidwe oyenera a LM3477 Buck Controller Evaluation Module, tsatirani malangizo awa:

1. Ikani zigawo za mphamvu (zogwira diode, inductor, ndi ma capacitor a fyuluta) pafupi ndi masanjidwe a PCB. Pangani zotsalira pakati pawo zazifupi.
2. Gwiritsani ntchito kutsata kwakukulu pakati pa zida zamagetsi ndi kulumikizana ndi magetsi kudera losinthira la DC-DC.
3. Lumikizani zikhomo zapansi za zolowetsa ndi zotulutsa zosefera ndikugwira diode moyandikira momwe mungathere pogwiritsa ntchito njira zoyenera zosinthira.

Onani buku la ogwiritsa la LM3477 Evaluation Board PCB Layout diagram.

Mawu Oyamba

LM3477 ndi mawonekedwe apano, owongolera a N channel FET apamwamba. Amagwiritsidwa ntchito kwambiri popanga tonde, monga momwe tawonetsera pa Chithunzi 1-1. Zida zonse zoyendetsera mphamvu zaderali ndi zakunja kwa LM3477, kotero zolowetsa, zotulutsa, ndi katundu zitha kuthandizidwa ndi LM3477.
Bungwe lowunika la LM3477 limabwera okonzeka kugwira ntchito motere:

• 4.5 V ≤ VIN ≤ 15 V
• VUTO = 3.3 V
• 0 A ≤ IOUT ≤ 1.6 A
• Dera ndi BOM pakugwiritsa ntchito izi zaperekedwa mu Chithunzi 1-1 ndi Gulu 1-1.

Gulu 1-1. Bill of Materials (BOM)

Chigawo	Mtengo	Gawo Nambala
CIN1	120 µF / 20 V	Mtengo wa 594D127X0020R2
CIN2	Palibe kulumikizana
COUT1	22 µF / 10 V	LMK432BJ226MM (Taiyo Yuden)
COUT2	22 µF / 10 V	LMK432BJ226MM (Taiyo Yuden)
L	10µH, 3.8 A	DO3316P-103 (Coilcraft)
RC	1.8 kΩ	CRCW08051821FRT1 (Vitramon)
CC1	12 nF/50 V	Zithunzi za VJ0805Y123KXAAT
CC2	Palibe kulumikizana
Q1	5 ndi 30v	IRLMS2002 (IRF)
D	100 V, 3 A	MBRS340T3 (Motorola)
RDR	20 ndi	Mtengo wa CRCW080520R0FRT1
RSL	1 kΩ	CRCW08051001FRT1 (Vitramon)
Mtengo wa RFB1	16.2 kΩ	CRCW08051622FRT1 (Vitramon)
Mtengo wa RFB2	10.0 kΩ	CRCW08051002FRT1 (Vitramon)
CFF	470 pf	Zithunzi za VJ0805Y471KXAAT
RSN	0.03 ndi	WSL 2512 0.03 Ω ±1% (Dale)

Kachitidwe

• Chithunzi 2-1 mpaka Chithunzi 2-2 chikuwonetsa zomwe zatengedwa kuchokera kudera lomwe lili pamwambapa pa bolodi lowunika la LM3477. Gulu lowunikirali lingagwiritsidwenso ntchito kuwunika dera loyang'anira ndalama zomwe zakonzedwa kuti zigwire ntchito zina kapena kuwunika kusinthanitsa pakati pa mtengo ndi magawo ena a magwiridwe antchito. Za exampndi, kutembenuka mtima kungawonjezeke pogwiritsa ntchito otsika RDS(ON) MOSFET, ndi ripple voltage ikhoza kutsitsidwa ndi ma capacitors otsika a ESR, ndipo chigawo cha hysteretic chingasinthidwe ngati ntchito ya RSN ndi RSL resistors.
• Kuthekera kosinthika kumatha kukulitsidwa pogwiritsa ntchito MOSFET yotsika ya RDS(ON), komabe, imatsika ngati voliyumu yowonjezera.tagndi kuwonjezeka. Kuchita bwino kumachepetsa chifukwa cha kuchuluka kwa nthawi yopangira diode komanso kutayika kwakusintha kwakusintha. Kusintha kotayika kumachitika chifukwa cha kutayika kwa kusintha kwa Vds × Id komanso kutayika kwa zipata, zonse zomwe zitha kutsitsidwa pogwiritsa ntchito FET yokhala ndi chipata chochepa. Pa otsika ntchito mkombero, kumene ambiri kutaya mphamvu
  mu FET ndikuchokera pakuwonongeka kosintha, kugulitsa RDS (ON) yotsika pang'ono pazipata kumakulitsa luso.
• Chithunzi 3-1 chikuwonetsa chiwembu cha bode cha LM3477 kuyankha pafupipafupi kwa loop pogwiritsa ntchito zida zakunja zomwe zalembedwa mu Table 1-1.

Hysteric Mode

Pamene katundu wapano akuchepa, LM3477 pamapeto pake idzalowa munjira ya 'hysteretic'. Liti
katundu wamakono akutsika pansi pa hystertic mode, kutulutsa voltage amakwera pang'ono. KuchulukatagWofanizira wa e protection (OVP) amazindikira kukwera uku ndikupangitsa mphamvu ya MOSFET kuzimitsa. Pamene katundu amakoka panopa kunja kwa capacitor yotulutsa, mphamvu yotulutsa voltage imatsika mpaka itagunda malire a OVP comparator ndipo gawolo likuyambanso kusintha. Khalidweli limabweretsa kutsika kwapang'onopang'ono, kutulutsa kwapamwamba kwambiri kwapamwamba kwambiritage ripple kuposa ndi yachibadwa kugunda m'lifupi kusinthasintha modulation chiwembu. Kukula kwa voltage ripple imatsimikiziridwa ndi magawo a OVP, omwe amatumizidwa ku voliyumu ya ndemangatage ndipo kawirikawiri 1.25 V mpaka 1.31 V. Kuti mudziwe zambiri, onani Makhalidwe Amagetsi tebulo mu LM3477 High Efficiency High-Side N-Channel Controller for Switching Regulator Data Sheet. Pankhani ya kutulutsa kwa 3.3-V, izi zimatanthawuza kutulutsa koyendetsedwa bwinotage pakati pa 3.27 V ndi 3.43 V. The hysteretic mode threshold point ndi ntchito ya RSN ndi RSL. Chithunzi 3-1 chikuwonetsa poyambira motsutsana ndi VIN ya bolodi yowunikira ya LM3477 yokhala ndi popanda RSL.

Kuchulukitsa Malire Apano

• RSL resistor imapereka kusinthasintha posankha ramp za chipukuta misozi. Malipiro otsetsereka amakhudza kutsika kochepa kwa kukhazikika (onani gawo la Slope Compensation mu LM3477 High Efficiency High-Side N-Channel Controller for Switching Regulator Data Sheet), komanso imathandizira kudziwa malire apano ndi hysteretic threshold. Monga example, RSL ikhoza kulumikizidwa ndikusinthidwa ndi 0-Ω resistor kuti pasapezeke chiwongola dzanja chowonjezera chotsetsereka chomwe chimawonjezedwa ku mawonekedwe aposachedwa kuti muwonjezere malire omwe alipo. Njira yodziwika bwino yosinthira malire apano ndikusintha RSN. RSL imagwiritsidwa ntchito pano kuti isinthe malire apano chifukwa cha kuphweka ndikuwonetsa kudalira kwa malire apano ku RSL. Posintha RSL kukhala 0 Ω, zotsatirazi zitha kukumana:
• 4.5 V ≤ VIN ≤ 15 V
• VUTO = 3.3 V
• 0 A ≤ IOUT ≤ 3 A
• Malire apano ndi ntchito yofooka ya malipiro otsetsereka ndi ntchito yamphamvu ya mphamvu yotsutsa. Pochepetsa RSL, malipiro otsetsereka amachepetsedwa, ndipo chifukwa chake malire akuwonjezeka. Mawonekedwe a hystertic awonjezekanso mpaka 1 A (onani Chithunzi 3-1).
• Chithunzi 4-1 chikuwonetsa chiwembu cha bode cha LM3477 kuyankha pafupipafupi kwa loop pogwiritsa ntchito zida zosinthidwa (RSL = 0 Ω) kuti mukwaniritse luso lamakono.

Kamangidwe Zikhazikiko

Masanjidwe abwino osinthira DC-DC atha kukhazikitsidwa potsatira malangizo ochepa osavuta:1. Ikani zigawo za mphamvu (zogwira diode, inductor, ndi zosefera zosefera) moyandikana. Pangani zotsalira pakati pawo zazifupi.

1. Gwiritsani ntchito kutsata kwakukulu pakati pa zida zamagetsi ndi kulumikizana ndi magetsi kudera losinthira la DC-DC.
2. Lumikizani mapini apansi a zolowetsa ndi zotulutsa zosefera ndikugwira diode moyandikira momwe mungathere pogwiritsa ntchito mowolowa manja-mbali yamkuwa kudzaza ngati ndege yabodza. Ndiye, kulumikiza izi pansi-ndege ndi vias angapo.
3. Konzani zigawo za mphamvu kuti malupu amakono osintha curl mbali yomweyo.
4. Njira yothamanga kwambiri komanso kubwerera pansi ngati njira zotsatizana.
5. Olekanitsa zomveka phokoso, monga voltage mayankho njira, kuchokera kumayendedwe aphokoso okhudzana ndi zida zamagetsi.
6. Onetsetsani kuti pali malo abwino ochepetsera chosinthira IC.
7. Ikani zigawo zothandizira pa IC converter, monga malipiro, kusankha pafupipafupi ndi zida zapampu, pafupi ndi IC converter momwe zingathere koma kutali ndi zizindikiro zaphokoso ndi zigawo za mphamvu. Pangani maulumikizidwe awo ku IC chosinthira ndi ndege yake yabodza kukhala yayifupi momwe mungathere.
8. Ikani midadada yosamva phokoso, monga midadada ya radio-modemu IF, kutali ndi chosinthira DC-DC, midadada ya digito ya CMOS, ndi mabwalo ena aphokoso.

Mbiri Yobwereza

ZINDIKIRANI: Manambala amasamba osinthidwa m'mbuyomu akhoza kusiyana ndi manambala amasamba omwe ali mumtundu wapano.
Zosintha kuchokera ku Revision E (April 2013) kupita ku Revision F (February 2022)

• Sinthani manambala a matebulo, ziwerengero, ndi zofananira m'chikalata chonsecho. ……………….2
• Adasintha mutu wa kalozera wosinthidwa……………………………………………………………………………………………………………………………………

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