Power Supply for Class D Amplifiers
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 Class D Switching Power Amplifiers and Power D/A conversion

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 10th July 2011, 08:53 PM #1 adailton diyAudio Member   Join Date: Feb 2011 Power Supply for Class D Amplifiers Hi Guys, Im building a class d amplifier (traditional,not ucd), Im using a signal generator for triangle reff signal and HIP4080 gate driver for mosfets. My amplifier will be BTL class and has max 30-50 W for 4 Ohm speaker. My question is about power supply. I don't want to build a power supply, I wanna buy new one. For my amplifiers specs., what is power supply's spec. be? I think 20-25V 4A max current smps is enough for me. What do you think? And how am I calculate current and voltage requirements from supply? And last silly question. My amplifiers power is (RMS current on load(speaker))^2 * impedance of speaker ? is it so easy? Thanks..
 10th July 2011, 09:33 PM #2 nigelwright7557   diyAudio Member     Join Date: Apr 2008 Location: Carlisle, England Yes power is I squared R. You can use a SMPS or a normal power supply. Have a look on ebay. __________________ PCBCAD51 pcb design software. 2018 version out now. http://www.murtonpikesystems.co.uk
diyAudio Member

Join Date: Feb 2011
Quote:
 Originally Posted by nigelwright7557 Yes power is I squared R. You can use a SMPS or a normal power supply. Have a look on ebay.
Thank you. But i want to learn which spec. is supply has?(for in spacing that i said)

For ex, how much current is my circuit take(max current)?

 10th July 2011, 11:54 PM #4 nigelwright7557   diyAudio Member     Join Date: Apr 2008 Location: Carlisle, England It takes about 100VA. I would go for 150VA supply. __________________ PCBCAD51 pcb design software. 2018 version out now. http://www.murtonpikesystems.co.uk
 13th July 2011, 09:03 PM #5 adailton diyAudio Member   Join Date: Feb 2011 My notebook's power supply(smps) is 20Vdc and 3,25 A. Is it enough for experiment? I don't need high power, because of BTL structure. Can I use? Is max current of supply inhibitory?
 11th August 2011, 07:19 PM #6 shon35us   diyAudio Member   Join Date: Oct 2005 POWER SUPPLY FOR CLASS D AMPS Can you use a transformer that unregulated output?
trevmar
diyAudio Member

Join Date: Jan 2011
Quote:
 Originally Posted by shon35us Can you use a transformer that unregulated output?
No, usually the transformer-based unregulated power 'bricks' have a much higher no-load voltage than the rated value.

Any laptop power-supply 'brick' is usually OK, however. You can usually tell by the shape and weight whether they are transformer based (bad) or switching-supplies (good).

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