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Class D Switching Power Amplifiers and Power D/A conversion

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Old 10th January 2005, 04:11 PM   #1
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Default 556 Timer IC 723 regulator

I have a schematic in a older book that uses the ne556 dual timer and a 723 regulator for the switching power supply. I am wondering if this system has since become obsolete? I haven't found anyone using these chips so im kinda wondering. Here is some of the perdinant data.
556 based oscillator/PWM Trigger pulse width slightly larger than 1us(micro sec)
it switches at 41KHz
ton median pulse width is 12us(micro s)

it takes 12vdc and converts to 24V dc and i was looking to modify it to take 14.4(car) and output 30+v I was going to build two of them for a split power supply.
I am looking to power a 50Wx2 rms amp based on 2 LM3875 chips like gainclones. If I'm heading in the wrong with this power supply please let me know.
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Old 11th January 2005, 03:02 AM   #2
Kenshin is offline Kenshin  China
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boost converter to power a D-AMP?

maybe a full-bridge D-AMP running at 14.4 will be better
-- efficiency,sound,and more simple gate drivers.
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Old 14th January 2005, 07:57 PM   #3
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hmm i thought that was the simpler approach...
I thought that class D would be not be suitable to a full range application. I only know of one Xant class D that is full range. I would like for it to be able to 50x2 full range and 100W Lp bridged. If class D is what would give better sound I guess thats what Im looking for....
Efficiency isn't really a concern because even 55% efficiency is 182W and about 12.6A. My 2 rockford amps draw around 90A.
Do you know of a schematic online that would meet my needs or that could be easily modified? I need +-35 to 40v split pwer supply
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