Hi there,
I am having a problem with my SMD MOSFET H Bridge. One of the N Ch MOSFETs burns up when no signal is being applied to the driver (a 4427, also surface mount), i.e. the inputs of the 4427 are pulled down.
The board can be seen below:
The FET with the arrow pointing to it is the faulty device. I have labelled the others, the power rails and drawn in the traces under the 4427 for clarity.
Does anyone know why this might be happening? The MOSFETs are rated at 4A each, and this also happened with no motor connected.
I'll try to dig out the datasheets for the MOSFETs… Can't tell the part number from the device, but I'll have written it down somewhere…
EDIT: Forgot to mention, the circuit is running off 7.4v unregulated from a LiPo battery. The logic signals coming in are 5v regulated.
Thanks,
Barnaby
I am having a problem with my SMD MOSFET H Bridge. One of the N Ch MOSFETs burns up when no signal is being applied to the driver (a 4427, also surface mount), i.e. the inputs of the 4427 are pulled down.
The board can be seen below:
The FET with the arrow pointing to it is the faulty device. I have labelled the others, the power rails and drawn in the traces under the 4427 for clarity.
Does anyone know why this might be happening? The MOSFETs are rated at 4A each, and this also happened with no motor connected.
I'll try to dig out the datasheets for the MOSFETs… Can't tell the part number from the device, but I'll have written it down somewhere…
EDIT: Forgot to mention, the circuit is running off 7.4v unregulated from a LiPo battery. The logic signals coming in are 5v regulated.
Thanks,
Barnaby
Last edited: