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I bought a bunch of IRFZ44Ns from China in the hopes of driving a motor bidirectionaly controls from and Arduino, but now I realise that a full bridge requires both P and N channel mosfets.. Is it possible to make a half bridge, or even a full bridge from N channel fets only?
Also, is there any reasons I don't see any schematics using IRFZ44Ns? Are they a poor choice for the application? It's only a small 4v motor.
Although you didnot mention the current rating of your motor and the available supply voltage I see 3 Solutions to your problem :
1-First to drive a Permenant magnet DC motor bidirectionally using an H-Bridge. you can use all N channel (this is the common practice) but you have to provide something called high side gate drive , this can be using pulse transformer , or gate driver IC , etc ... please note that even then low side mosfet need 10-15v on its gate to work properly unless it is a special type called (logic level or trech) mosfet which work at 4.5v to provide low RDS. Since your motor is 4v , i assume your battery is close to 4 maybe 6v ??
2-Another solution is to use a single mosfet in low side configuration , and use a double throw relay to reverse the motor wires . but this requires the motor to stop completey before changing direction.
3-The option most prefered for small scale applications is to buy an IC that contains the mosfets and drivers built in , inaddtion to current and thermal protection , for example : L298 L6201 DRV8816 TLE 5206 LMD18245.
