USB Fan

Single-cell USB Fan with voltage selection and USB-C Charger built around TP4056+DW01A and TPS61170.

This board is untested.

Designed to be manufactured by JLCPCB as 4layer PCB. It is not possible to manufacture as 2layer PCB.

Features

• 4 fan voltages (5V / 9V / 12V / 24V)
  • Select before turning the SW1 on
• USB-C charging
  • 5V 1.5A max (5.1k resistors)
  • TP4056 charger
    • Status LEDs
      • Red = Charging
      • Blue = Standby
    • 1S 1A charging (1 cell in series, unlimited in parallel)
  • 1.5A discharge (DW01A)
• Power-on switch
  • Only affects the output, battery can still charge
  • Do not turn on when charging
  • Minimum current runs through the switch
    • No special switch needed
    • It is not a toggle!

Warnings

• There are no reverse-polarity protections
  • Not on battery or USB-C
• D3+D4 don't have JLCPCB part number, pick any 1206 LEDs you like
• Default component placement has to be tweaked on JLCPCB online editor
  • J1 shifted to right position
  • L1 rotated 90deg
  • U1, U2, U3 and U4 must be rotated so 1st pin is in the corner with long line on Stencil layer
    • U1 = top right, U2 = top left, U3 = bottom right, U4 = top left

TODO

• Power LED (white) ?
• Add assembly tooling holes