Hi, I Have designed this very simple PWM LED Driver, but have couple question needs to make sure before i order all the parts and build a prototype.
This circuit will be controlled with a 5v PWM from a microcontroller and that signal will go through a comparator turns the 5v PWM singal to 12v. Then the singal will drive the power mosfet and it will light up the LEDs.
ok The questions i have is..
1) what kind of power mosfet should i use? If i only want to draw 3A of current MAX.
2) for the comparator, I can just pick up any cheapo op-amp and it should be fine right?
2) Why at that node (red arrow) the voltage goes below zore, from what i learned from school, that node should never go below zore right?
Thanks so much in advance,
Sonoma_Dog
This circuit will be controlled with a 5v PWM from a microcontroller and that signal will go through a comparator turns the 5v PWM singal to 12v. Then the singal will drive the power mosfet and it will light up the LEDs.
ok The questions i have is..
1) what kind of power mosfet should i use? If i only want to draw 3A of current MAX.
2) for the comparator, I can just pick up any cheapo op-amp and it should be fine right?
2) Why at that node (red arrow) the voltage goes below zore, from what i learned from school, that node should never go below zore right?
Thanks so much in advance,
Sonoma_Dog
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