# Proper power supply for this gate driver IC

I will use the gate driver configuration shown below:

Gate Driver datasheet

As you can see, the 5V and 12V are isolated. I chose this AC/DC converter for the 5V supply. It's 1 Output 5V/3A. It will supply a STM32 and a Raspberry Pi.

I decided to step up the 5V to 12V using this Isolated Module DC DC Converter.

That module is just 1W/ 84mA max. My question is: Can it effectively supply the peak currents to charge gate capacitance using decoupling capacitors?

Do the math. Find the total effective gate capacitance of the FET. Determine the maximum rate you will ever switch the FET. From that you can get the average current required on from the 12 V supply. If that's more than 84 mA, then you chose inappropriate parts.

If less than 84 mA, then it is doable. Find the total charge that is required to drive the get high once. Assume all that charge will come from the cap across the power input of the gate driver. Use a capacitance large enough so that the voltage drop is acceptable.

Once you do all that, you'll realize that you don't really need much. Then just plunk down a 1 µF 20 V cap and be done with it.