Electronics > Beginners
MOSFET switching a load on a buck module really fast a good idea?
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skillz21:
Am I able to directly wire into the buck circuit and somehow control it between 0v (or the lowest possible) and the maximum voltage, which I would set with the onboard potentiometer?
Seekonk:
The 2596 shutdown pin #5 far right is quite fast.  I use it to turn these modules into MPPT solar controllers.  Just lift that lead from the trace and feed your PWM signal directly into that pin.  Then just set the maximum voltage from the pot and let the micro adjust it down. High turns it off. Regardless, you should learn to do this trick.
skillz21:
I had a look at the datasheet yesterday, and I did notice the ON/OFF pin, although I didn't think of PWMing it. If I directly used a PWM signal on that pin, I could just ditch the first MOSFET altogether... right? Since when the pin is in the OFF state, it will basically switch the whole circuit off...?
skillz21:
Also, just a thought, if I were to go with my initial solution of putting a MOSFET in beetween the buck converter and the LED, would I just be able to put a large capacitor on the output to avoid the converter output from swinging around too much?
Seekonk:
All these modules have just enough capacitance to keep them stable and extra capacitors should be added. That would be a good idea. If you go with the ON/OFF pin, you have to do that also the capacitor is needed to average the lower frequency of the PWM.
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