USB-C Temperature and Humidity Sensor Node

flux

I’ll harden the existing 24V→5V→3.3V power section: inspect the current LM2596/LDO wiring, verify datasheet-critical passives, update sizing/properties, and run power/ERC checks.

flux

I reviewed and annotated the existing industrial power section against the LM2596S-5.0 and TLV1117LV33 datasheets.
Completed:
  • Confirmed existing parts: 24V screw terminal, SMBJ33A TVS, LM2596S-5.0, 33µH shielded inductor, SS34 Schottky, and TLV1117LV33 LDO.
  • Updated power-part properties and net metadata for current, temperature, thermal, and layout constraints.
  • Updated the Design Notes with the full power-section review and required fixes.
Important findings:
  • The existing 33µH inductor and SS34 diode are marginal for a robust 24V/3A industrial LM2596 design.
  • The schematic still needs explicit PTC fuse, reverse-polarity protection diode or ideal-diode MOSFET stage, and real LM2596 VIN/5V bulk capacitors.
  • The 3.3V LDO is electrically valid, but thermally risky above a few hundred mA continuous because it dissipates (5V − 3.3V) × IOUT. For a heavy RP2350B/W5500/USB-hub system, a 3.3V buck or buck-plus-LDO architecture is safer.
Fix power stage
Use buck for 3.3V
Run power review
Choose LCSC parts
Create power schematic
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J10
J8 2 - J9 2
RP2350B Industrial Ethernet Controller thumbnail
Industrial-grade RP2350B controller with W5500 Ethernet, 24V input power, isolated industrial I/O, RS485, USB hub, relay outputs, and robust connector protection for -40°C to +85°C consumer/industrial use.

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