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-   -   Regulated powersupply for UCD modules?? (http://www.diyaudio.com/forums/class-d/109106-regulated-powersupply-ucd-modules.html)

Jonnravn 26th September 2007 07:41 PM

Regulated powersupply for UCD modules??
 
Has anybody tried using a regulated powersupply with there UCD modules?

Pierre 26th September 2007 08:09 PM

Some people has tried regulated PSUs but switching ones, not linear. You will ruin the high efficiency of a Class-D using a regulated linear PSU.

Jonnravn 27th September 2007 05:16 PM

Why will I ruin the effeciency of the modules by using a regulatet supply?.....is that not just a question of making the regulated supply able to deliver the 20 amps that UCD modules are limited to?

Pierre 27th September 2007 09:16 PM

Well, in a linear regulated PSU, you need a raw DC voltage above the regulated value. Let's say that, in order to have some margin, you need above 10-15V over the required output. Any current drawn by the amplifier, multiplied by that difference will becompe power dissipated in the pass devices (transistors, typically) of your regulated PSU.

ghemink 28th September 2007 03:34 AM

Quote:

Originally posted by Pierre
Well, in a linear regulated PSU, you need a raw DC voltage above the regulated value. Let's say that, in order to have some margin, you need above 10-15V over the required output. Any current drawn by the amplifier, multiplied by that difference will becompe power dissipated in the pass devices (transistors, typically) of your regulated PSU.

Unless you use a capacitance multiplier, which is kind of semi-regulated. Then you can have less voltage drop in the regulator itself.

Best regards

Gertjan


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