Power H Bridge

This is a h bridge with protective diodes and in a real build with a capacitor. http://puu.sh/w5osO/2843b067e2.png But since I am using an arduino the voltage is too low to correctly drive the irlz44n, without turning into a nuclear reactor without coolant. So as a question how should I drive these mosfets, I intend to use PWM and a vast array of frequencies. I was thinking of using a TC4420 but I am not particularly sure as how that should be wired. Does it require capacitors and how would this all look?

I don't know the answer but your title gives no indication that you want help with mosfets. if you edit your Original Post you can change the title and then someone who does know might notice it.

...R

The IRLZ44N is a logic-level MOSFET: http://www.irf.com/product-info/datasheets/data/irlz44n.pdf It should switch fine at 5V. Is your Arduino not running at 5V?

There are MOSFET driver chips. Perhaps one of those could be used between the Arduino and the MOSFET.

An alternative might be to drive the MOSFET input with a pull-up resistor to the power rail and pull the line low with an NPN transistor.

johnwasser: The IRLZ44N is a logic-level MOSFET: http://www.irf.com/product-info/datasheets/data/irlz44n.pdf It should switch fine at 5V. Is your Arduino not running at 5V?

There are MOSFET driver chips. Perhaps one of those could be used between the Arduino and the MOSFET.

An alternative might be to drive the MOSFET input with a pull-up resistor to the power rail and pull the line low with an NPN transistor.

Pretty sure it runs at 5 volts its a pretty regular uno. But I might try using an NPN as I have a few of them.

Your problem are the top FETs, which act as high-side drivers - see sample circuits in the web. If you use N-channel FETs for such drivers, their gate voltages should be higher than the supply voltage, to turn them fully on. Even if you use a NPN transistor for a level shifter, a voltage higher than the FET’s threshold voltage will remain between source and drain, at least 2V for the IRLZ44N. This will not only reduce the full voltage swing on the load to <10V, with a 12V battery, but the FETs also will burn 2W * output current, so that they need a heat sink. No such problem exists with P-channel FETs for the high-side drivers.