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Putting the PCB in an enclosure will make the effect worse.
The primary source of heat is likely the LDO regulator. (These are inherently inefficient because they burn off excess voltage as heat.) The next suspects are the LEDs (LEDs were blinking in this case) and then the MCU.
There are a few options here:
Move the sensor to the corner of the board
Add cutouts to the ground plane around the sensor to reduce sensitivity
Switch the LDO regulator for a switching regulator.
Lower the clock frequency of the MCU
disable the LEDs during normal operation.
Note
It's worth confirming that the regulator is the problem using a thermal camera.
Regulator Option
The RT6150B is a good candidate for a new power supply option. It is 90% efficient in the operating region we will use, and it's identical to what's used on the Pico 2 board. See Pico 2 Datasheet. It will cost more board space, though.
The text was updated successfully, but these errors were encountered:
The PCB has ~3 degrees C of self-heating.
Putting the PCB in an enclosure will make the effect worse.
The primary source of heat is likely the LDO regulator. (These are inherently inefficient because they burn off excess voltage as heat.) The next suspects are the LEDs (LEDs were blinking in this case) and then the MCU.
There are a few options here:
Note
It's worth confirming that the regulator is the problem using a thermal camera.
Regulator Option
The RT6150B is a good candidate for a new power supply option. It is 90% efficient in the operating region we will use, and it's identical to what's used on the Pico 2 board. See Pico 2 Datasheet. It will cost more board space, though.
The text was updated successfully, but these errors were encountered: