I am designing a boost converter which is rated on 100 watts, 12 volts to 24 volts, switching frequency is 20 khz, in open-loop conditions. when I give the input power supply to the circuit as 12 volts, my driver (HCPL 4506 Mosfet Driver) will take VCC as 24 volts due to My microcontroller can generate a 3.3-volt output PWM 20khz switching frequency so when low-level amplitude generated by a microcontroller will be given to the low side of mosfet driver to get a large amplitude of voltage from the high side of the driver. the voltage should be large enough which can turn on the gate terminal of mosfet. the threshold voltage of my mosfet is 15 Volts for turning on the gate.

So suppose if I provide VCC as 12 Volts in the driver, so they will give low amplitude voltage as volts approx, it is not enough to turn on the gate of the mosfet. So when we are working in the circuit we checked we need to provide 24 volts to the driver circuit (VCC) then it can generate 15 volts approx, it is enough to turn on the gate of mosfet.

now when I have built this circuit with proper orientation in an open loop, the problem is coming I have 24 volts Dc supply (SMPS) for the input power supply where I am using a voltage regulator 7812 IC which will convert 24 to 12 volts for the boost converter(power circuit) and 24 volts directly given to the Driver VCC. when I powered on the circuit, the output voltage of the boost converter is coming 4 volts, I should come 24 volts. I checked this circuit, all the things are good. I think I am getting a grounding problem. Anyone can help me with this.