So I will be providing my buck converter with external PWM signal, which I will give through a microcontroller. The microcontroller spits out 3.3V PWM signal but to drive the MOSFET in the converter I need a 5V PWM, so bacially I need to design a circuit that converts 3.3V PWM signal to 5V PWM signal. I have attached by circuit design and the oscilloscope graph for input PWM and output PWM as well.
My problem is that because of high frequency, the output is not a square wave. I only tested for 50% duty cycle, and the converter worked properly with my circuit, however, I fear that if the duty cycle is anything else, the weird waveform will interfere with correct convert output.
How do I fix the output so that it is a square wave? Do I need to add capacitor elements or should I replace the optocoupler? What do you think about using ADUM3400 here?
My problem is that because of high frequency, the output is not a square wave. I only tested for 50% duty cycle, and the converter worked properly with my circuit, however, I fear that if the duty cycle is anything else, the weird waveform will interfere with correct convert output.
How do I fix the output so that it is a square wave? Do I need to add capacitor elements or should I replace the optocoupler? What do you think about using ADUM3400 here?
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