Further to all the help I had on this thread: https://www.techpowerup.com/articles/160/images/ps229.pdf
I have decided not to bugger around trying to run power supplies in parallel but instead to use one high power PSU for my ~14v power supply.
This will be to power an old JBL BP300.1 amplifier I had kicking around into a 4 ohm load.
I have identified what seems to be the IC to concentrate on:
https://www.techpowerup.com/articles/160/images/ps229.pdf
The PS229.
My question is firstly is it this chip that regulates the voltage or does it simply shut things down in case of out of spec voltage?
If the former than would it possible to doctor some voltage in or out of it to produce something in order of 13.-14.4v?
there is also a SMD 393 dual regulator which might need attention too, all help gratefully received.
I have decided not to bugger around trying to run power supplies in parallel but instead to use one high power PSU for my ~14v power supply.
This will be to power an old JBL BP300.1 amplifier I had kicking around into a 4 ohm load.
I have identified what seems to be the IC to concentrate on:
https://www.techpowerup.com/articles/160/images/ps229.pdf
The PS229.
My question is firstly is it this chip that regulates the voltage or does it simply shut things down in case of out of spec voltage?
If the former than would it possible to doctor some voltage in or out of it to produce something in order of 13.-14.4v?
there is also a SMD 393 dual regulator which might need attention too, all help gratefully received.
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All it does is monitor the voltages and if out of spec FPO tells the control IC to shut down. PGO is the Power Good line controller.
It doesn't have anything to do with regulation.
It doesn't have anything to do with regulation.
Thanks Jon. Looking at the data sheet it seems to monitor the voltage drop on the 12v line using a sensing resistor called Rs12 ( page 8 ) and gives recommended values of >0.002ohms.
Apart from not having come across a resistor that small in value can anything be done across this sense line?
Given it has nothing to do with regulation would it possible to fool it entirely by feeding it a regulated 12v supply from elsewhere?
Apart from not having come across a resistor that small in value can anything be done across this sense line?
Given it has nothing to do with regulation would it possible to fool it entirely by feeding it a regulated 12v supply from elsewhere?
The difference 12V supply of 14V supply is hardly audible.
And no, that is NOT the regulator chip.
And no, that is NOT the regulator chip.
Thanks for all your help chaps, I have in the end decided "bollocks to this" after being given two giant 12v toroidal transformers from a 12v lighting circuit.
The office next to mine was being refurbished and they pulled out all manner of stuff, mainly little 50W SMPS units but also these two toroids which I estimate to be around 800VA each.
They do almost exactly 12v RMS and so will be around 15.5v after rectifying.
Much easier than I think.
The office next to mine was being refurbished and they pulled out all manner of stuff, mainly little 50W SMPS units but also these two toroids which I estimate to be around 800VA each.
They do almost exactly 12v RMS and so will be around 15.5v after rectifying.
Much easier than I think.
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