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DC/DC converter with uC interface
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aix:
Driven by curiosity, I took apart a cheap Chinese 7530 blower fan that I'd managed to kill earlier.

Quality of construction aside, the PCB does have provisions for a third pin, though that part of the PCB is unpopulated.  The pin is labelled "O/P" and — if populated — would have been derived from FG/RD signals, all of which makes me think it's a sense output rather than a PWM input.
ogden:

--- Quote from: aix on May 05, 2019, 09:17:34 am ---I am a hobbyist working on a microcontroller project in which I’d like to control the speed of a 12V BLDC fan by varying its supply voltage (no PWM).

I’d like to power everything from a single 5V USB supply

--- End quote ---

There is no point to make 5V->12V boost converter for 12V fan when you can just use 5V fan.  There are gazillions of various 5V fans available.
Simon:
True, I meant to say that and forgot to mention it.
Simon:

--- Quote from: aix on May 06, 2019, 10:10:25 am ---Driven by curiosity, I took apart a cheap Chinese 7530 blower fan that I'd managed to kill earlier.

Quality of construction aside, the PCB does have provisions for a third pin, though that part of the PCB is unpopulated.  The pin is labelled "O/P" and — if populated — would have been derived from FG/RD signals, all of which makes me think it's a sense output rather than a PWM input.

--- End quote ---

i tried looking for the datasheet for the controller. It's very vague and does not even explain the chip. I am not sure what they mean by single phase motor.
aix:

--- Quote from: ogden on May 06, 2019, 10:16:48 am ---There is no point to make 5V->12V boost converter for 12V fan when you can just use 5V fan.  There are gazillions of various 5V fans available.

--- End quote ---

The fan form factor (7530 blower, I posted a drawing earlier) is a hard constraint for my project.  While 5V versions do exist, they seem to be much less readily available.  Additionally, I'd like compatibility with a pre-existing controller whose replacement I am designing.  That controller requires a 12V fan.

P.S. This is also an opportunity for me to learn some new skills, which is an end in itself.
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