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moPsy-project / eurorack-power-breakout

Breakout board for Eurorack power on the breadboard
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Explore zero drop diodes #21

Open penguineer opened 3 months ago

penguineer commented 3 months ago

Using FETs, it is possible to build a "diode" without voltage drop. Explore this option for the next revision.

penguineer commented 3 months ago

https://components101.com/articles/design-guide-pmos-mosfet-for-reverse-voltage-polarity-protection

image

The most popular MOSFETs that are used for a wide range of reverse polarity protection-related circuits

  • IRF9530
  • IRF9540
  • Si2323 (Low Voltage Low Current Operations)
  • ILRML6401 (Low Voltage Low Current Operations)
penguineer commented 3 months ago

IRF 9530 - MOSFET, P-Kanal, -100V, -12A, RDS(on) 0,3 Ohm, TO-220AB

penguineer commented 3 months ago

Biggest issue is that viable p-channel MOSFETs for THT come in the TO-220 form factor, which makes them not very suitable for the specific application.

Ideally there would be a TO-92 or similar device with U_DS > 12V, U_gs > 12V (to drop the Zener), I_D > 1.5A and very low RDS_on.