Texas Instruments LM3477 Buck Controller Evaluation module

Tlhahisoleseding ya Sehlahiswa

LM3477 Buck Controller Evaluation Module ke mokhoa oa hajoale, molaoli oa FET oa lehlakore le holimo oa N. E sebelisoa hangata litlhophisong tsa buck.
LM3477 e lumella mefuta e mengata e fapaneng ea lintho tse kenang, tse hlahisoang le mejaro.
Boto ea tlhahlobo e tla e loketse ho sebetsa ka maemo a ikhethileng.

Litaelo tsa Tšebeliso ea Sehlahisoa

1. Netefatsa hore likarolo tsa matla (catch diode, inductor, le filter capacitor) li behiloe haufi le sebopeho sa PCB. Etsa hore mesaletsa e lipakeng tsa tsona e be khutšoanyane.
2. Sebelisa mesaletsa e pharalletseng lipakeng tsa likarolo tsa motlakase le likhokahano tsa motlakase ho potoloho ea converter ea DC-DC.
3. Kopanya lithapo tsa fatše tsa li-capacitor tsa ho kenya le ho tsoa 'me u tšoare diode haufi-ufi ka hohle kamoo ho ka khonehang u sebelisa mekhoa e nepahetseng ea ho hlophisa.

Bill ea Lisebelisoa (BOM)

Karolo	Boleng	Nomoro ea Karolo
CIN1	594D127X0020R2	Che, hokela
CIN2	Che, hokela	Che, hokela
KOUT1	LMK432BJ226MM (Taiyo Yuden)	LMK432BJ226MM (Taiyo Yuden)
KOUT2	DO3316P-103 (Coilcraft)	1.8 k
L	CRCW08051821FRT1 (Vitramon)	12 nF/50 V
RC	VJ0805Y123KXAAT (Vitramon)	Che, hokela
CC1	5 A, 30 V	IRLMS2002 (IRF)
CC2	100V, 3A	MBRS340T3 (Motorola)
Q1	20	CRCW080520R0FRT1 (Vitramon)
D	1 k	CRCW08051001FRT1 (Vitramon)
RDR	16.2 k	CRCW08051622FRT1 (Vitramon)
RSL	10.0 k	CRCW08051002FRT1 (Vitramon)
RFB1	470 pf	VJ0805Y471KXAAT (Vitramony)
RFB2	0.03	Che, hokela

Tshebetso

Li-graph tsa VIN li bonts'itsoe ka har'a buka ea mosebelisi bakeng sa litšupiso.

Sebopeho sa Metheo

Bakeng sa tlhophiso e nepahetseng ea LM3477 Buck Controller Evaluation Module, latela litataiso tsena:

1. Beha likarolo tsa matla (diode ea ho tšoara, inductor, le li-filters capacitor) haufi-ufi ho sebopeho sa PCB. Etsa hore mesaletsa e lipakeng tsa tsona e be khutšoanyane.
2. Sebelisa mesaletsa e pharalletseng lipakeng tsa likarolo tsa motlakase le likhokahano tsa motlakase ho potoloho ea converter ea DC-DC.
3. Kopanya lithapo tsa fatše tsa li-capacitor tsa ho kenya le ho tsoa 'me u tšoare diode haufi-ufi ka hohle kamoo ho ka khonehang u sebelisa mekhoa e nepahetseng ea ho hlophisa.

Sheba bukana ea mosebelisi bakeng sa sets'oants'o sa Moralo oa Boto ea Tekolo ea LM3477 PCB.

Selelekela

LM3477 ke mokhoa oa hajoale, molaoli oa FET oa lehlakore le phahameng la N. E sebelisoa haholo ho litlhophiso tsa buck, joalo ka ha ho bonts'itsoe ho Figure 1-1. Likarolo tsohle tse tsamaisang matla a potoloho li kantle ho LM3477, ka hona, mefuta e mengata e fapaneng ea lintho tse kenang, liphetho le meroalo e ka amoheloa ke LM3477.
Boto ea tlhahlobo ea LM3477 e itokisetsa ho sebetsa maemong a latelang:

• 4.5 V ≤ VIN ≤ 15 V
• MOSEBETSI = 3.3 V
• 0 A ≤ IOUT ≤ 1.6 A
• Potoloho le BOM bakeng sa kopo ena li fanoe ho Setšoantšo sa 1-1 le Lethathamo la 1-1.

Lethathamo la 1-1. Bill of Materials (BOM)

Karolo	Boleng	Nomoro ea Karolo
CIN1	120 µF/20 V	594D127X0020R2
CIN2	Ha ho khokahano
KOUT1	22 µF/10 V	LMK432BJ226MM (Taiyo Yuden)
KOUT2	22 µF/10 V	LMK432BJ226MM (Taiyo Yuden)
L	10 µH, 3.8 A	DO3316P-103 (Coilcraft)
RC	1.8 kΩ	CRCW08051821FRT1 (Vitramon)
CC1	12 nF/50 V	VJ0805Y123KXAAT (Vitramon)
CC2	Ha ho khokahano
Q1	5 A, 30 V	IRLMS2002 (IRF)
D	100V, 3A	MBRS340T3 (Motorola)
RDR	20 Ω	CRCW080520R0FRT1 (Vitramon)
RSL	1 kΩ	CRCW08051001FRT1 (Vitramon)
RFB1	16.2 kΩ	CRCW08051622FRT1 (Vitramon)
RFB2	10.0 kΩ	CRCW08051002FRT1 (Vitramon)
CFF	470 pf	VJ0805Y471KXAAT (Vitramony)
RSN	0.03 Ω	WSL 2512 0.03 Ω ±1% (Dale)

Tshebetso

• Setšoantšo sa 2-1 ho ea ho 2-2 se bonts'a lintlha tse ling tsa benchmark tse nkiloeng ho potoloho e ka holimo ho boto ea tlhahlobo ea LM3477. Boto ena ea tlhahlobo e ka boela ea sebelisoa ho lekola potoloho ea "buck regulator" e ntlafalitsoeng bakeng sa sebaka se fapaneng sa ts'ebetso kapa ho lekola phapanyetsano lipakeng tsa litšenyehelo le paramethara ea ts'ebetso. Bakeng sa mohlalaample, katleho ea phetoho e ka eketsoa ka ho sebelisa MOSFET e tlase ea RDS(ON), molumo oa ripple.tage ka theoleloa ka li-capacitor tse tlase tsa ESR, 'me moeli oa hysteretic o ka fetoloa e le mosebetsi oa li-resistors tsa RSN le RSL.
• Ts'ebetso ea phetoho e ka eketsoa ka ho sebelisa RDS(ON) MOSFET e tlase, leha ho le joalo, e theoha joalo ka vol.tage ea eketseha. Ts'ebetso e ea fokotseha ka lebaka la ho eketseha ha nako ea ho tsamaisa diode le tahlehelo e eketsehileng ea switching. Litahlehelo tse fetohang li bakoa ke tahlehelo ea phetoho ea Vds × Id le tahlehelo ea liheke, tseo ka bobeli li ka theoleloang ka ho sebelisa FET e nang le matla a tlase a heke. Ka lipotoloho tse tlaase-mosebetsi, moo boholo ba tahlehelo ea matla
  ho FET ho tsoa ho tahlehelo ea switching, ho rekisa ka RDS e phahameng (ON) bakeng sa bokhoni bo tlase ba heke ho tla eketsa ts'ebetso.
• Setšoantšo sa 3-1 se bonts'a morero oa bode oa karabo ea maqhubu a LM3477 ea loop e bulehileng e sebelisa likarolo tse ka ntle tse thathamisitsoeng ho Lethathamo la 1-1.

Mokhoa oa Hysteric

Ha mojaro o ntse o fokotseha, LM3477 e tla qetella e kene ka mokhoa oa 'hysteretic' oa ts'ebetso. Neng
moroalo oa hona joale o theoha ka tlase ho moeli oa mokhoa oa hysteretic, tlhahiso ea voltage phahama hanyane. The overvolvetagSebapali sa e protection (OVP) se utloa ho phahama hona 'me se etsa hore matla a MOSFET a koalehe. Ha mojaro o hula hona joale ho tsoa ho capacitor ea tlhahiso, tlhahiso ea voltage theoha ho fihlela e fihla moeling o tlase oa papiso ea OVP mme karolo e qala ho fetoha hape. Boitšoaro bona bo etsa hore ho be le sekhahla se tlase, se phahameng sa peak-to-peak volumetage ripple ho feta ka mokhoa o tloaelehileng oa ho feto-fetoha ha molumo oa pulse width. Boholo ba tlhahiso voltage ripple e khethoa ke maemo a pele a OVP, a fetisetsoang ho maikutlo a voltage 'me ka tloaelo ke 1.25 V ho 1.31 V. Bakeng sa boitsebiso bo eketsehileng, bona tafole ea Litšobotsi tsa Motlakase ho LM3477 High Efficiency High-Side N-Channel Controller bakeng sa Switching Regulator Data Sheet. Tabeng ea tlhahiso ea 3.3-V, sena se fetolela molumo o laoloangtage pakeng tsa 3.27 V le 3.43 V. The hysteretic mode threshold point ke mosebetsi oa RSN le RSL. Setšoantšo sa 3-1 se bonts'a moeli oa hysteretic khahlano le VIN bakeng sa boto ea tlhahlobo ea LM3477 e nang le RSL le ntle le eona.

Ho Eketsa Moedi oa Hona Joale

• Mohanyetsi oa RSL o fana ka maemo a bonolo ha u khetha ramp ea matšeliso a letsoapo. Puseletso ea letsoapo e ama bonyane ba inductance bakeng sa botsitso (sheba karolo ea Puseletso ea Slope ho LM3477 High Efficiency High-Side N-Channel Controller bakeng sa Switching Regulator Data Sheet), empa hape e thusa ho fumana moeli oa hona joale le moeli oa hysteretic. Joalo ka mohlalaample, RSL e ka khaoha 'me ea nkeloa sebaka ke sehanyetsi sa 0-Ω e le hore ho se ke ha e-ba le matšeliso a eketsehileng a moepa a eketsoang ho sebopeho sa hona joale sa kutlo ho eketsa moeli oa hajoale. Tsela e tloaelehileng ea ho fetola moeli oa hona joale ke ho fetola RSN. RSL e sebelisoa mona ho fetola moeli oa hajoale molemong oa ho nolofatsa le ho bonts'a ho its'etleha ha moeli oa hajoale ho RSL. Ka ho fetola RSL ho 0 Ω, maemo a latelang a ka fihlelleha:
• 4.5 V ≤ VIN ≤ 15 V
• MOSEBETSI = 3.3 V
• 0 A ≤ IOUT ≤ 3 A
• Moeli oa hona joale ke ts'ebetso e fokolang ea matšeliso a letsoapo le ts'ebetso e matla ea mohanyetsi oa kutlo. Ka ho fokotsa RSL, matšeliso a matsoapo a fokotseha, 'me ka lebaka leo moeli oa hona joale oa eketseha. Boemo ba hysteretic mode le bona bo tla eketseha ho fihla ho 1 A (sheba setšoantšo sa 3-1).
• Setšoantšo sa 4-1 se bonts'a morero oa bode oa LM3477 karabelo e bulehileng ea loop frequency ho sebelisa likarolo tse fetotsoeng (RSL = 0 Ω) ho fihlela bokhoni bo phahameng ba hona joale.

Sebopeho sa Metheo

Sebopeho se setle sa li-converter tsa DC-DC se ka kenngoa ts'ebetsong ka ho latela litataiso tse 'maloa tse bonolo tsa moralo:1. Beha likarolo tsa matla (diode ea ho tšoasa, inductor, le li-filter capacitor) haufi. Etsa hore mesaletsa e lipakeng tsa tsona e be khutšoanyane.

1. Sebelisa mesaletsa e pharalletseng lipakeng tsa likarolo tsa motlakase le likhokahano tsa motlakase ho potoloho ea converter ea DC-DC.
2. Kopanya lithapo tsa fatše tsa li-capacitor tse kenang le tse hlahisoang 'me u tšoase diode haufi-ufi ka hohle kamoo ho ka khonehang u sebelisa karolo e ngata ea koporo e tlatsitsoeng e le sefofane sa pseudo-ground. Ka nako eo, amahanya sena ho fatše-sefofane le vias 'maloa.
3. Hlophisa likarolo tsa matla e le hore li-loops tsa hona joale tse fetohang curl ka nqa e le nngwe.
4. Matla a maqhubu a phahameng a litsela le ho khutlela fatše e le litsela tse bapileng tse tsoelang pele.
5. Arola mesaletsa e hlokolosi ea lerata, joalo ka voltagtsela ea maikutlo, ho tsoa ho mesaletsa e lerata e amanang le likarolo tsa matla.
6. Etsa bonnete ba hore ho na le sebaka se setle sa IC sa converter.
7. Beha lisebelisoa tse tšehetsang IC converter, tse kang matšeliso, khetho ea makhetlo a mangata le likarolo tsa pompo ea tefiso, haufi le converter IC ka hohle kamoo ho ka khonehang empa hole le mesaletsa e lerata le likarolo tsa matla. Etsa hore likhokahano tsa bona ho converter IC le sefofane sa eona sa pseudo-fatše e be khutšoanyane ka hohle kamoo ho ka khonehang.
8. Beha li-circry tse utloang lerata, joalo ka li-block tsa radio-modem IF, hole le converter ea DC-DC, li-block tsa dijithale tsa CMOS, le li-circuits tse ling tse lerata.

Nalane ea Phetoho

HLOKOMELA: Linomoro tsa maqephe bakeng sa litokiso tse fetileng li ka fapana le linomoro tsa maqephe a mofuta oa hajoale.
Liphetoho ho tloha ho Revision E (April 2013) ho ea ho Revision F (Hlakola 2022)

• E ntlafalitse mokhoa oa ho etsa linomoro bakeng sa litafole, lipalo, le litšupiso tse amanang le tokomane eohle. …………… .2
• E ntlafalitse sehlooho se ntlafalitsoeng sa tataiso ea basebelisi……………………………………………………………………………………………………… 2

TSEBISO LE BOHLOKOA

• TI E FANA KA DATA YA MOSEBETSI OA TŠEBELETSO LE HO TŠEPAHALA (HO KAKARETSOA LE LIPAKENG TSA LITŠOANTŠISO), MESEBETSI EA HO HLAHALA (HO TSEBA LE MERARO EA TŠEBELETSO), KOPO KAPA KELETSO E MONG EA TLHALOSO, WEB LITHUTO, LITSEBISO TSA TŠEBELETSO, LE MESEBETSI E MONG “JALO KA HA E LE” LE KA LIPHOSO TSOHLE, LE E IKONELA LITIISETSO TSOHLE, TSE BOLELANG LE TSE BOLELANG, HO kenyeletsoa ntle le MOEDI LITIISETSO TSE FELENG TSA BORARO TSA THEKISO, HO LOKELA MOSEBETSI OA MOSEBETSI OA MOHOLO. LITHOELO LETLOTLO .
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BOHLOKOA TSEBISO

• Aterese ea poso: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
• Copyright © 2022, Texas Instruments Incorporated

Litokomane / Lisebelisoa

Texas Instruments LM3477 Buck Controller Evaluation module [pdf] Bukana ea Mosebelisi LM3477 Buck Controller Evaluation Module, LM3477, Buck Controller Evaluation Module, Controller Evaluation module, Evaluation Module, Mojule

Litšupiso

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