MCP236 damaged when turned on/off
Posted: Wed Feb 05, 2020 6:17 pm
Hi all,
I think I am doing something wrong with some MCP236 controllers, but cannot figure out what, so I would like to ask for your help. I have 3 MCP236, had some issues with 2 of them in the past, and now have an issue with one, for the same reason I think.
My setup is as follows: I have a controller, 2 DC motors (these ones: https://www.pololu.com/product/3497) with encoders (these ones: https://www.pololu.com/product/3499). I have a 2.2 kohms pull-up resistors attached to each encoder channel (2 DC motors with quadrature encoders, so 2 channels, and a total of 4 resistors). Everything is powered by a DC power supply. See the attached picture.
The motors are not used when the issue occurs. The issue seems to happen when turning the controllers on or off (I don't know) a few times. I think there may be something wrong with the way I turn it on or off. To turn it on, I connect the power supply to the controller, with a voltage set to 12V, and the current set to 0A. I then increase the current, and the controllers turn on. To turn it off, I decrease the current to 0A, with the voltage always set to 12V. After turning it on and off a few times, the controller is drawing 0.15A with no red/green light on (so... damaged I guess).
Do you know what mistake I am doing, that causes a damage to the controller?
Best,
Cedric
I think I am doing something wrong with some MCP236 controllers, but cannot figure out what, so I would like to ask for your help. I have 3 MCP236, had some issues with 2 of them in the past, and now have an issue with one, for the same reason I think.
My setup is as follows: I have a controller, 2 DC motors (these ones: https://www.pololu.com/product/3497) with encoders (these ones: https://www.pololu.com/product/3499). I have a 2.2 kohms pull-up resistors attached to each encoder channel (2 DC motors with quadrature encoders, so 2 channels, and a total of 4 resistors). Everything is powered by a DC power supply. See the attached picture.
The motors are not used when the issue occurs. The issue seems to happen when turning the controllers on or off (I don't know) a few times. I think there may be something wrong with the way I turn it on or off. To turn it on, I connect the power supply to the controller, with a voltage set to 12V, and the current set to 0A. I then increase the current, and the controllers turn on. To turn it off, I decrease the current to 0A, with the voltage always set to 12V. After turning it on and off a few times, the controller is drawing 0.15A with no red/green light on (so... damaged I guess).
Do you know what mistake I am doing, that causes a damage to the controller?
Best,
Cedric