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ansemjo / luftctl

small esp32-c3 based pwm fan controller which powers from usb
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The 12V LED keep on even Boost_EN low #1

Open kscccc opened 1 year ago

kscccc commented 1 year ago

The 12V LED keep on even Boost_EN low. It should be better by using Boost_EN pin drive the LED. or Add a PMOS/Load switch on 5V before Boost IC Vin to totally cut off the supply.

ansemjo commented 1 year ago

Well, yes, you're absolutely right. :P For some reason I thought that disabling the regulator would turn off the 12V supply altogether – which is, of course, not the case due to the straight path through the inductance and diode.

I am currently in no real need for a new luftctl PCB .. do you want to make one with the above already fixed?

I'm thinking that having the "choice" between 5V and 12V is a "feature". But I know that some fans do not completely turn off, even at 5V and zero duty cycle .. so yes, an additional load switch seems like a good idea.