shaiqbashir Posted May 28, 2006 Report Share Posted May 28, 2006 Hi guys!well im building an H-bridge circuit for driving my powerful 12V 5A motor. Im using the following block diagram for my circuit:Okz now, Im using IRF9540 as P-channel and IRF540 as N-channel. what i have seen that P channle gets on when we apply 0V to its gate and it gets off when we apply a 12V on its gate. On the contrary N channle gets on when 12V is applied on its gate and it gets Off when 0V is applied.So, what i have done is connected LEft gates of both mosfets with each other and right gates of both mosfets with each other. Then from each side the connected is given to TC4420 which is a single MOSFET Driver IC. Quote Link to comment Share on other sites More sharing options...
shaiqbashir Posted May 28, 2006 Author Report Share Posted May 28, 2006 okz there is a bit info i forgot to draw in my H-bridge diagram and that is. With every P-channel MOSFET there is a 10K resistor connected between its gate and Vcc. and with every N-channle MOsfet, there is a 10K resistor connected between its gate and Ground. Please explain me the logic behind connecting this resistor as well. Quote Link to comment Share on other sites More sharing options...
indulis Posted June 3, 2006 Report Share Posted June 3, 2006 Those resistors make sure the MOSFET's turn off. MOSFET input impedance is very high and a slight amount of leakage current could turn them on. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.