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Old 25th September 2009, 07:25 PM   #1
sivrat is offline sivrat  South Africa
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Default confused with with schematic

Hi,

I was looking at the tda 2030A datasheet ( http://www.st.com/stonline/products/...9/tda2030a.pdf) and on page 10, they have a schematic of a active filter tri amp, each amp having the filter on its input. very interesting.

However, the circuit is designed around using a single source 36v supply.
With my limited electronics knowledge, I cant figure out how that works, considering that the chip's max is 18v

Could someone, point me in a direction where or how I can learn more on what they are doing to give the chip the correct voltage?

I guess the filtering will also work if the seperate amps were powered from +/- rails?

Thanks a bunch.

Travis
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Old 25th September 2009, 07:30 PM   #2
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The chip's max is +/-18V, which is just like 36V. Note the input and output coupling caps.
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Old 26th September 2009, 06:09 AM   #3
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From the spec, the absolute max supply voltage is +/- 22 V. It is equivalent to single-rail 44 V. An app note from TI, SLOA058, describes single-supply op-amp. TDA2030 is essentially a power op-amp.
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Old 27th September 2009, 05:58 AM   #4
sivrat is offline sivrat  South Africa
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Thanks guys,

will have to read up so more
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