ekline309
10 W
Based on observation, it seems many controls use dual N-channel instead of P-N FET pairs. How can the top NMOS ever be saturated?? I don't get this....
ekline309 said:Based on observation, it seems many controls use dual N-channel instead of P-N FET pairs. How can the top NMOS ever be saturated?? I don't get this....
Jeremy answered this question correctly, but the other answer is: Although N-channel FETs are "better" FETs in some respects, a lot of people use P Channel FETs in simple controls because theya re soooo much easier to drive and they are "good enough" FETs. A 2n2222 connected to a high side P channel FET will drive it just fine, for about a nickel, vs a complex high side driver circuit with all kinds of parts.ekline309 said:Based on observation, it seems many controls use dual N-channel instead of P-N FET pairs. How can the top NMOS ever be saturated?? I don't get this....
my thoughts exactly.mikal said:highside n channel??????? why,why would you wanna do that.
this is what I've been using as well.llile said:A 2n2222 connected to a high side P channel FET will drive it just fine
Jeremy Harris said:The snag with P channel FETs, though, is that you just can't get them with specs that match those of N channel FETs for a reasonable price
dnmun said:i thought that the H-bridge ICs had a special charge pumping circuit that allowed the high side to be on continuously. gotta google when i get a chance and see what wikipedia says.
ekline309 said:Jeremy Harris said:The snag with P channel FETs, though, is that you just can't get them with specs that match those of N channel FETs for a reasonable price
so really the only reason is cost, but if you add the extra gate drive componentry its a wash...