New YwRobot MB102 power module overheats

Other Hardware General Electronics
21

Zapro:
PLEASE note, that the USB connector is connected in parallel with the DC barrel jack

Of course it is not. The USB is connected to 5V output of the regulator and it can be used as both input and output. When USB is used as input then input voltage should be 5V and barrel connector should be disconnected not to power the 5V regulator. Here is another schematics where the connection is more clear.

Addicore YwRobot Breadboard Power Supply.pdf (152 KB)

22

chupo_cro:
Of course it is not. The USB is connected to 5V output of the regulator and it can be used as both input and output. When USB is used as input then input voltage should be 5V and barrel connector should be disconnected not to power the 5V regulator. Here is another schematics where the connection is more clear.

Well the one i had, it was in parallel. The switch didn't disconnect the USB-plug. When i put in 9V in the DC-jack it had 9V in the USB-plug.

23

Zapro:
Well the one i had, it was in parallel. The switch didn't disconnect the USB-plug. When i put in 9V in the DC-jack it had 9V in the USB-plug.

Strange. It probably was some badly designed model. On the other hand, I might have such (bad) modules too :slight_smile: I didn't check all of them and I order a few now and then from different sources. I burnt one of them just a few days ago, 5V regulator didn't survive accidentally shorted output although it lasted just for a moment. But that wasn't a surprise because I used 12V input.

Regards