Here’s
is a circuit that used for the USB source, power will enter through the USBVCC
section into a P-channel MOSFET FDN340P. Explaining briefly, MOSFETS are transistors that
are normally closed (connected) until a certain amount of voltage triggers the
gate. Consequently, triggering the MOSFET opens the transistor (disconnected).
Using this characteristic, a comparator is connected to the gate terminal of
the MOSFET to function as a switch mechanism. If you use the USB source, it
will just power up the 3.3V regulator since the MOSFET is normally connected.
If you plug a dc supply, the LMV358 op-amp will produce a high output triggering the gate
of the MOSFET, disconnecting the USB source from the 3.3V regulator. So if both
are plugged, the board will use the DC power supply. This is the figure
of the circuit.
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Showing posts with label Arduino. Show all posts
Showing posts with label Arduino. Show all posts
Thursday, 8 September 2022
USB Power Source Circuit for Arduino
Power Supply Circuit for Arduino
This is the schematic diagram powers our Arduinos. For this, we can use either DC power supply or USB connection as a source. To trace how the circuit works, let us start with the 5V linear voltage regulator NCP1117ST50T3G. This regulator has a pretty straightforward function. It takes voltage input up to 20V and converts it to 5V. The Vin of this regulator is connected to the DC power supply via the M7 diode. This diode provides reverse polarity protection, which means current can only flow from the power supply to the regulator and not the other way around. This the figure of the circuit.
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