confused with with schematic

sivrat · 25th September 2009, 07:25 PM

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

dsavitsk · 25th September 2009, 07:30 PM

The chip's max is +/-18V, which is just like 36V. Note the input and output coupling caps.

panson_hk · 26th September 2009, 06:09 AM

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.

sivrat · 27th September 2009, 05:58 AM

Thanks guys,

will have to read up so more

25th September 2009, 07:25 PM	#1
sivrat diyAudio Member Join Date: Jun 2009	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

25th September 2009, 07:30 PM	#2
dsavitsk diyAudio Member Join Date: Jan 2005 Location: Chicago	The chip's max is +/-18V, which is just like 36V. Note the input and output coupling caps. __________________ http://www.ecpaudio.com

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26th September 2009, 06:09 AM	#3
panson_hk :) diyAudio Member Join Date: Aug 2005 Blog Entries: 10	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.

27th September 2009, 05:58 AM	#4
sivrat diyAudio Member Join Date: Jun 2009	Thanks guys, will have to read up so more

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