Hi,
I just placed a quadruple half h bridge driver in my circuit. I am running it with a pic18, and a TI H - bridge.
This is the data sheet for the driver: https://www.electro-tech-online.com/custompdfs/2008/09/sn754410.pdf
Anyhow, I tried it first with the 5V off the microcontroller to power a small hobby motor, and it worked fine. It was reversing fine as well. I then tried to use a gear motor that I want with same 5 volts and that was fine as well. I have 4 of these motors that need to be driven in pairs. They are 12V motors so I have a 12V Ni-MH battery at 2300mAh. I have tried it with no chips and it drives the motors fine.
I then hook up the 12V batter to the designated pin on the driver and the other to the common ground for the microcontroller and everything, turn on the microcontroller and the driver starts smoking. Looking at the data sheet, the driver should be able to handle 2A at peak and 1.1A steady. When I connect the motor the the battery by it self, I read 70mA of current draw.
The other half (2/4) of the driver still work correctly. I have a spare but just one.
I was wondering what I am doing wrong? Maybe I connected the battery wrong, but I would your advice before I try again.
Thanks
I just placed a quadruple half h bridge driver in my circuit. I am running it with a pic18, and a TI H - bridge.
This is the data sheet for the driver: https://www.electro-tech-online.com/custompdfs/2008/09/sn754410.pdf
Anyhow, I tried it first with the 5V off the microcontroller to power a small hobby motor, and it worked fine. It was reversing fine as well. I then tried to use a gear motor that I want with same 5 volts and that was fine as well. I have 4 of these motors that need to be driven in pairs. They are 12V motors so I have a 12V Ni-MH battery at 2300mAh. I have tried it with no chips and it drives the motors fine.
I then hook up the 12V batter to the designated pin on the driver and the other to the common ground for the microcontroller and everything, turn on the microcontroller and the driver starts smoking. Looking at the data sheet, the driver should be able to handle 2A at peak and 1.1A steady. When I connect the motor the the battery by it self, I read 70mA of current draw.
The other half (2/4) of the driver still work correctly. I have a spare but just one.
I was wondering what I am doing wrong? Maybe I connected the battery wrong, but I would your advice before I try again.
Thanks