Hello everybody,
I am building an H Bridge for a motor controller and I have encountered a problem, in which I havent found a solution online. Maybe is a stupid question, but I really dont know what to think.
I use 2 PCH MOSFETs for the high side and 2 NCH MOSFETs for the low side and my power supply is about 24V. So the PCH's source is connected to 24V, and if I want this FET to conduct I have to give on gate a potential low enough, considering the Vth. But, the thing is that every FET that I found online can handle a gate to source voltage up to 20V, so the minimum of the input voltage (ie the gate voltage) has to be 4V. So far it is ok, but another problem is that using a FET with max Vgs=20V I have to use NCH FETs for the low side with a threshold voltage higher than 4V (so not to conduct when the PCH does) and searching on the internet I did not find any.
Is it ease to find FETs with threshold voltage higher than 4-5 Volts?
Also, I cannot get how to drive the bridge. I found many ICs, but I want to do it by myself with decrete components. Anyway, the main problem is how to manage the fact that FETs handle Vgs<20 and 2<Vth<4.
I am building an H Bridge for a motor controller and I have encountered a problem, in which I havent found a solution online. Maybe is a stupid question, but I really dont know what to think.
I use 2 PCH MOSFETs for the high side and 2 NCH MOSFETs for the low side and my power supply is about 24V. So the PCH's source is connected to 24V, and if I want this FET to conduct I have to give on gate a potential low enough, considering the Vth. But, the thing is that every FET that I found online can handle a gate to source voltage up to 20V, so the minimum of the input voltage (ie the gate voltage) has to be 4V. So far it is ok, but another problem is that using a FET with max Vgs=20V I have to use NCH FETs for the low side with a threshold voltage higher than 4V (so not to conduct when the PCH does) and searching on the internet I did not find any.
Is it ease to find FETs with threshold voltage higher than 4-5 Volts?
Also, I cannot get how to drive the bridge. I found many ICs, but I want to do it by myself with decrete components. Anyway, the main problem is how to manage the fact that FETs handle Vgs<20 and 2<Vth<4.