Povezava LDO Regulatorja

flux

2:01

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Super vprašanje. Uporabi ta ponovljiv postopek, da boš vedel “kaj gre kam” in “katere vrednosti vzeti” – najprej po metodi, nato konkretno za tvoj USB‑C -> LDO primer.
Kako se lotiš vsakega vezja
  1. Začni z datasheetom (Typical Application)
  • Odpri datasheet glavnega čipa (npr. tvoj LDO Regulator).
  • Prekopiraj “Typical Application” shemo 1:1: isti pini, isti zunanji elementi (Resistor, Capacitor, itd.) in njihove vrednosti/ESR, kot so predpisane.
  • Preveri poglavja: Recommended Operating Conditions, External Components, Stability, EN pin thresholds.
  1. Napajanje in LDO pravila (iz znanja)
  • Izbor LDO: dimensioniraj tok za vse porabnike + “add 25% buffer”.
  • Dropout: računaj na najslabši primer pri I_peak, ne samo I_avg.
  • Učinkovitost: LDO učinkovitost sledi Vout/Vin in Iq; večji Iq je smisel za boljši PSRR samo, če res potrebuješ tišjo napajalno tirnico.
  • C_in/C_out: vzemi točno takšne vrednosti in ESR, kot jih zahteva datasheet; postavi ju čim bližje pinoma IN/OUT. Če uporabiš Ferrite Bead na 5 V, naj bosta decoupling kondenzatorja takoj ZA biserom pri pinu VIN.
  • Derating: Capacitor naj delujejo pri največ 60% njihove nazivne napetosti; Resistor pri največ 60% njihove nazivne moči.
  1. Splošno razelektrenje/decoupling (iz znanja)
  • Pri vsakem IC daj 0.1 µF keramični čim bližje VCC pinu in večji (npr. 10 µF) v bližino iste tirnice.
  • Upoštevaj DC-bias MLCC: 10 µF X5R pri višji napetosti pogosto realno pomeni manjšo efektivno kapaciteto.
  1. Pull-up/pull-down (EN, GPIO) (iz znanja)
  • Ne uporabljaj “privzetih” vrednosti brez konteksta; manjši upor je hitrejši, a poveča tok ob vlečenju v nič.
  • Za visokimpedančne enable linije je tipično 100 kΩ, vendar preveri pragove v datasheetu.
  1. USB‑C 5 V vhod (iz znanja)
  • Ne veži CC linij direktno na GND. Uporabi eksplicitni Rd Resistor na CC1 in CC2 do GND, da signaliziraš “sink”.
  • Zaščiti D+/D− z nizkokapacitivno TVS Diode blizu konektorja na DP1, DN1, DP2, DN2.
Kako to uporabiš zdaj v tvojem projektu (USB‑C -> LDO 3.3 V)
  • IN LDO -> VBUS; dodaj C_in Capacitor med IN in GND po datasheetu. Če dodaš Ferrite Bead na 5 V, postavi C_in takoj za biserom.
  • GND LDO -> GND.
  • OUT LDO -> tvoja 3V3 tirnica; dodaj C_out Capacitor med OUT in GND po datasheetu.
  • EN LDO -> po datasheet logiki: za “vedno vklopljeno” ga priveži prek Resistor na IN/3V3 (če je active-high) ali na GND (če je active-low); ali ga vodiš na MCU GPIO s primernim pull-om.
  • NC -> pusti nezvezan.
  • CC1, CC2 -> vsak prek Rd Resistor na GND.
  • Zaščita USB podatkovnih linij: dodaj TVS Diode blizu konektorja na DP1, DN1, DP2, DN2.
Kaj še potrebujem od tebe, da greva do natančnih vrednosti
  • Povej točen MPN tvojega LDO Regulator. Potem ti iz datasheeta izluščim točne C_in/C_out vrednosti in ESR okno, logiko EN in priporočila za postavitev.
  • Ocenjen tok 3.3 V tirnice (povprečni in kratkotrajni vrh). Tako preveriva tokovno rezervo (+25%) in dropout na I_peak.
  • Če želiš, ti po tem pripravim kratek “checklist” za pregled napajanja celotne sheme.
Extract LDO required caps
Scan schematic for missing decoupling
Pick USB-C CC resistors/TVS
Check board power nets
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VBUS__2
GND
DN1
GND__3
SHELL
VBUS
SHELL__3
DN2
DP2
CC2
SHELL__2
GND__2
GND__1
DP1
SBU1
VBUS__3
CC1
SBU2
VBUS__1
SHELL__1
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Net Portal
    Net Portal
    Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
    jharwinbarrozo
    43.0M
  • Power Net Portal
    Power Net Portal
    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
    jharwinbarrozo
    11.4M
  • Generic Resistor
    Generic Resistor
    A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Capacitor
    Generic Capacitor
    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Inductor
    Generic Inductor
    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
    jharwinbarrozo
    15.8k
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
  • RMCF0805JT47K0
    RMCF0805JT47K0
    47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
    jharwinbarrozo
    1.2M
  • 875105359001
    875105359001
    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
    jharwinbarrozo
    1.1M

USB4085-GF-A

USB4085-GF-A thumbnail
USB-C (USB TYPE-C) USB 2.0 Receptacle Connector 24 (16+8 Dummy) Position Through Hole, Right Angle USB Type-C receptacle 16 pin power only#CommonPartsLibrary #IntegratedCircuit #Connectors #USB-C

Properties

USB C

GCT

USB4085-GF-A

gct.co/files/drawings/usb4085.pdf

J

creativecommons.org/licenses/by/4.0/

Pricing & Availability

Distributor

Qty 1

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