Dc to Dc Buck Converter and Mosfet Driver

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Tony_Ulp

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I am trying to design dc to dc buck converter to be controlled by micorcontroller or fpga.

The problem i am having is that the gate resistor is getting hot quickly. (please see attachment - diagram excatly as
connected on the stripboard).

1. Can you please have a look at the diagram and advise me whats wrong. TC4451 inverter / TC4452 non inverter. (only had these types available)
Resistor between gate and source. Do i need one for this application? how to calculate the value?
2. I want to test buck converter with external pwm, e.g. 555 timer just to be sure is working ok beforeconnected to micorcontroller / fpga board.

Please help me with this project i really appreciated.


Thank you very much

Tony
 

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  • DC2DC Buck Converter and Mosfet Driver.jpg
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    Fahim.max

    Points: 0
    Its wrong connection of zenar diode
reason could be the frequency at which you are driving the MOSFET is too high......

EA
 

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