Hello all,
I'm working on a UCD type amplifier.
Got my proto pcb made with the help of LTspice.
It's based on the UM10155.
My problem is that in LTspice everything works great and its oscillating around 400 kHz, but in reality i get oscillation around 1.1 MHz and the mosfet driving looks like ****....
I know that simulations and real world can diver greatly but this is way off !
What i understand from UCD is that the feedback network mainly determines the switching frequency by pushing the transfer function(s) through 180 degree phase shift.
I must say that i'm relatively new to the UCD topology and have a lot to learn and learned a lot allready...
But maybe someone has some tips on where to look at...
Or someone has build a UCD like amplifier and can give me hints/tips to look at.
Cheers, and thanks...
I'm working on a UCD type amplifier.
Got my proto pcb made with the help of LTspice.
It's based on the UM10155.
My problem is that in LTspice everything works great and its oscillating around 400 kHz, but in reality i get oscillation around 1.1 MHz and the mosfet driving looks like ****....
I know that simulations and real world can diver greatly but this is way off !
What i understand from UCD is that the feedback network mainly determines the switching frequency by pushing the transfer function(s) through 180 degree phase shift.
I must say that i'm relatively new to the UCD topology and have a lot to learn and learned a lot allready...
But maybe someone has some tips on where to look at...
Or someone has build a UCD like amplifier and can give me hints/tips to look at.
Cheers, and thanks...