AC to 5V Converter

flux

I’ll compare viable non-isolated 3 W architectures against current capability, thermal margin, BOM area, cost, and ESP32/relay burst behavior, then implement the best datasheet-backed option and re-verify the schematic.
Created a component
LNK3208D-TL
LinkSwitch-TN2 highly integrated 725 V offline switcher for non-isolated buck supplies; up to 775 mA typical CCM buck output capability per family datasheet, SO-8C.

flux

I established the evaluation criteria and implementation plan, but no schematic or BOM changes were made because the account has no available ACUs.
Remaining work:
  • Compare LNK3206D, 12 V plus secondary buck, and alternative integrated offline regulators
  • Verify a genuine ≥3 W continuous operating point and thermal margin
  • Select the smallest practical architecture
  • Replace the LNK3204D power stage and update all component ratings
  • Re-run ERC and update the hazardous-live safety documentation
The current schematic remains the verified LNK3204D, 5 V/120 mA design and should not be used for the ESP32-plus-relay load.
Compare AC-DC ICs
Check LNK3206D thermal
Review BOM changes
Document requirements
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5V Hazardous-Live LNK3204D Offline Buck

5V Hazardous-Live LNK3204D Offline Buck thumbnail
230 VAC to 5 V non-isolated offline buck using Power Integrations LNK3204D. Every net, including HAZ_5V and HAZ_RETURN, is hazardous live/mains-referenced; sealed internal use only with galvanically isolated test and programming equipment.

Properties

Power Supply

0.6W non-isolated

Safety review required

All circuitry including 5 V rail and return is HAZARDOUS LIVE; sealed internal smart-plug use only; isolated programming and galvanically isolated instrumentation mandatory.

230

V

Pricing & Availability

Distributor

Qty 1

Arrow

$0.99–$2.22

Digi-Key

$0.00

HQonline

$0.18–$0.19

LCSC

$1.99–$2.19

Mouser

$3.50–$3.75

TME

$2.27–$2.81

Verical

$0.83–$2.20

Controls