500W 12V to ±45V Invertor PSU For Car Audio!!!

[siliconray]

This is absolute a cool gadget for audio DIYers. It convert 12V from car battery to dual ±45V DC power supply for audio amplifiers. Voltage is adjustable by adding feedback resistors in parallel with the on board res. The max power is up to 500W! Don't tell me it's not enough for your car audio...
See details here:
500W 12V to ±45V car audio PSU

[IMGDEAD]http://www.siliconray.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/c/a/car-audio-power-1.jpg[/IMGDEAD]

[IMGDEAD]http://www.siliconray.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/c/a/car-audio-power-3.jpg[/IMGDEAD]

 

[siliconray]

Did a test today with a electronic load. The voltage was set to 45V, current set to 6A. Postive and negative output are tested seperated because the electronic load don't have dual input
Positive voltage dropped from 45.1V to 44.7V and negative voltage drops from -45.1V to -44.8V. Result is quite positive.

 

[thesoundkid]

what voltage can it be reduced to?
25-28v +/-?

 

[siliconray]

can be down to ±15V. Only need to add a resistor in parallel to the voltage feedback resistor.

 

[siliconray]

More pics. The newest version upgrated the MOSFET with a more powerful part. Output is more stable.

[IMGDEAD]http://gallery.siliconray.com/var/resizes/Power-supply/500W-12V-to-%2B-45V-car-audio-power-inverter/DSCN8813.JPG?m=1320038006[/IMGDEAD]
[IMGDEAD]http://gallery.siliconray.com/var/resizes/Power-supply/500W-12V-to-%2B-45V-car-audio-power-inverter/DSCN8808.JPG?m=1320038016[/IMGDEAD]
[IMGDEAD]http://gallery.siliconray.com/var/resizes/Power-supply/500W-12V-to-%2B-45V-car-audio-power-inverter/DSCN8809.JPG?m=1320038012[/IMGDEAD]

 

[siliconray]

How to enable the module

Hello customers, sorry for the valgue instruction. To enable the modue, the pad marked with R must be connected to +12V. See the photo attached

 

[siliconray]

Hot to modify the voltage

Just solder 2 resistors to modify the output voltage. See the attached photo

 

[norazmi]

this board have short circuit protection?

 

[siliconray]

Yes it is short circut protected.

 

[JZatopa]

I have been looking for something like this, now I just need to find the right chassis.

 

[JZatopa]

I have a quick question. If I were to use this at +/- 18V, could it handle the continuous power draw of 2 F5 amplifier boards?

 

[siliconray]

Hi DJNBUZ, how many amper does one F1 board need? the module can supply max 15A current

 

[JZatopa]

The F 5 needs about 1.3A, with +/-24Vdc (not sure why I used 18V). That is continuous current, though.

 

[siliconray]

oh..then it's more than enough.

 

[AudioSan]

the F5 will draw up to 2.6A pr ch.
1.3A at idle and up to the point it switch to class B.
but yes. it can be used on 2ch of F5.

 

[JZatopa]

Thanks

 

[th3bl0b]

I had a quick question regarding this module. How do you set the output voltage to be less? I know that you just have to put a resistor in parallel but say I wanted +/- 25V what value would I put in parallel?

 

[JZatopa]

I would also like to know this. Is it possible to soldier in a pot here? If so what would you recommend?

 

[th3bl0b]

What I've found is that... you can determine your new output voltage by using the following equation...

45V / 82.6kohms = new voltage / new equivalent resistance.

 

[siliconray]

Hello s sorry for the late reply.

Please look at the schematic below:
[IMGDEAD]http://gallery.siliconray.com/var/resizes/Power-supply/500W-12V-to-%2B-45V-car-audio-power-inverter/tl494.pdf3.jpg?m=1334731135[/IMGDEAD]
the feedback network is formed by R24//R20 + R11 and R21//R25 + R22. Voltage on Pin14 is 5.0V. The voltage on Pin15 must equal to pin 16. R20 and R21 is actually 82.6ko. It's not quite complicate to calcualte the value of R24 and R25 with this conditions.