I want to know the reason behind why this elements are connected in mosfet driver circuit. Basically I want to know the use of this elements .
elements are
(1)R1,R2 and diode in parallel with them
(2)R3,R4
MOSFET Driver Circuit – Detailed Guide on Driving Circuits
diodesgate-drivingmosfetmosfet-driverresistors
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Best Answer
The resistor is there to control the gate charge current and through that the MOSFET off-to-on time. It's important for the whole bunch of reasons. My personal favorite is that MOSFET going on too fast creates current through the miller capacitance (D to G) and makes itself oscillating (sometimes kills the driver and other circuits, if totally out of control). Other reason is EMI. The resistor of course comes at a tradeoff: the MOSFETs gets hotter.
The diode is there to quickly discharge the MOSFET gate and turn it off.
Pull down resistors ensure that when the driver is off, the MOSFET's gate is discharged. Without it it can pick up noises, randomly open, destroy itself and the other one.