Hi,

I will use the gate driver configuration shown below:
Gate Driver datasheet
MOSFET 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?

 

This is my approach:

The 12V step-up module will supply an average current of I = Qxfs, where Q is the total charge of the mosfet and fs my pwm frequency. According to my mosfet datasheet the total charge is 160nC, my pwm frequency is 10 kHz. So I = 160nC * 10000 = 1.6 mA... am I right?

 

No it wont work on the 12V rail as it only supplies 84mA.

I would use a 12V 3A adapter and use a dc/dc to step down your 5V for the raspberry pi.

 

No it wont work on the 12V rail as it only supplies 84mA.

How is so?