im kind of new to the concept of using, more specifically, driving mosfets under different conditions. just a couple questions:
1. ive been playing with a few IRFZ44N's and i noticed on the datasheet it specifies a max drain-source voltage of 55v, and a max gate-source voltage of +/- 20v. i was led to believe you would need around 12v more than your Vds, on the gate, in order for the mosfet to be completely 'on'. obviously i wouldnt be able to go to some 60v on the gate to drive a 48v load. so my question is, would it be fully on at 20v on the gate regardless of drain-source voltage?
2. ive been thinking of trying logic level mosfets, but the same question popped up. would a logic level mosfet be fully on at 5v TTL or 12v CMOS on gate regardless of Vds?
3. is there a somewhat simple way to obtain a higher voltage (very low current) from a 12v source other than a dc-dc converter? i have a PWM hooked up to the lights on my gokart, but the IRF540s doing the work are being driven at 12v. even paralleled they are generating a good amount of heat. (dont ask me why i have PWM on my headlights, i was bored, lol)
thanks guys!
1. ive been playing with a few IRFZ44N's and i noticed on the datasheet it specifies a max drain-source voltage of 55v, and a max gate-source voltage of +/- 20v. i was led to believe you would need around 12v more than your Vds, on the gate, in order for the mosfet to be completely 'on'. obviously i wouldnt be able to go to some 60v on the gate to drive a 48v load. so my question is, would it be fully on at 20v on the gate regardless of drain-source voltage?
2. ive been thinking of trying logic level mosfets, but the same question popped up. would a logic level mosfet be fully on at 5v TTL or 12v CMOS on gate regardless of Vds?
3. is there a somewhat simple way to obtain a higher voltage (very low current) from a 12v source other than a dc-dc converter? i have a PWM hooked up to the lights on my gokart, but the IRF540s doing the work are being driven at 12v. even paralleled they are generating a good amount of heat. (dont ask me why i have PWM on my headlights, i was bored, lol)
thanks guys!