3.3V to 5V Step-Up Design

hoopla

hoopla

Vad jag kan se så är det redan kopplat. Fråga: skall 3V3_IN och 5V_OUT dela på samma GND när det är en sublayout i ett större schema?
170 days

flux

1:25

Accessing knowledge base.

Kort svar: Ja. En boost från 3.3 V till 5 V är icke‑isolerad, så både 3V3_IN och 5V_OUT ska dela samma GND (en enda sammanhängande jord).
Praktiska riktlinjer
  • Använd ett enda GND‑nät/plan som referens för både in- och utgång.
  • Lokalisera returströmmarna: lägg in‑ och ut‑kondensatorernas minus nära varandra och nära regulatorns GND, så blir switchslingorna små.
  • Om du exponerar pinnar i sublayouten får du gärna ha en GND‑pin; om du väljer både “GND_IN” och “GND_OUT” måste de kopplas ihop lokalt på sublayouten (en “stjärnpunkt” vid in‑kondensatorns GND är bra).
  • Dra lastens retur (5 V‑sidan) tillbaka till samma lokala GND‑nod, inte via SW‑området.
  • Enda skälet att separera jordar är om du medvetet använder galvanisk isolation (vilket en vanlig boost inte gör).
  • Om du behöver extra ren 5 V nedströms, kan ett litet post‑filter hjälpa, men var försiktig: “en LC eller π‑filter med 10 kHz cutoff kan orsaka stabilitetsproblem” med regulatorns återkoppling. Välj i så fall ett filter som inte interagerar med loopens dynamik.
skapa stjärnjord
antal jord-vias
välja filterkondensator
placering GND-pinnar
lägga till LC-filter
170 days
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U1
R1
Resistance
732kΩ
R2
Resistance
100kΩ
C2
Capacitance
22µF
5V_OUT
GND
GND
C1
Capacitance
10uF
D1
3V3_IN
GND
GND
L1
EN
Resistance
100kΩ
  • Ground
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    A common return path for electric current. Commonly known as ground.
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3.3V STEP UP 5V SUBLAYOUT

3.3V STEP UP 5V SUBLAYOUT thumbnail
SUBLAYOUT 3V3 step up boost to 5V

Properties

Properties describe core aspects of the project.

Pricing & Availability

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