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Power Entry

@electrace/power-entry@1.0.0 · CC-BY-4.0

vin 9–18 Viout_max 2 A

Power Entry

Takes a DC barrel-jack input (9–18 V) and protects everything downstream before handing off a clean VBUS rail and ground.

Q1 — a P-channel MOSFET for reverse-polarity protection. Unlike a series diode it drops almost no voltage, so you don't waste headroom or generate heat.
D1 — a TVS diode that clamps input spikes (plug transients, inductive kicks) before they reach the regulator.
C1 — bulk capacitance to hold the rail up through fast current demands.

Exposes: vout (VBUS, 9–18 V, up to 2 A) and gnd.

⚠ The TVS clamps around 33 V — sustained input above ~30 V will cook it. Keep the supply within the rated range.

Exposed nets

●voutout · power · 9–18 V

●gndout · gnd

Inside this block

J1

barrel-2.1mm

DC input jack

Q1

p-fet

blocks reverse polarity without a diode drop

D1

tvs

clamps input voltage spikes

C1

100uF

bulk input hold-up

Limits & gotchas

⚠vin.max 30V — Input TVS clamps ~33 V; sustained input above 30 V will cook it.

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