The picture shows the 12V power supply interface. What are the functions of D9, D10, D11, and D12 in the picture?
Shelly postato su January 12, 2021
D10 should play a protective role to prevent J13 from being plugged in reversely and to protect the back circuit.
D9 should be a rectifier
I don't know what D11 and D12 mean. . But it should be a role. Also, your 12V VCC_IN reversely connects to D12 and then powers the USB?
Denny postato su January 12, 2021
D9 rectification, anti-reverse; D10 ESD protection; D11/D12 input 2 select 1 to prevent backflow.
Bradford postato su January 12, 2021
D10 is a TVS, anti-surge voltage and the like play the role of input voltage protection, the others should be anti-reverse and anti-backflow
