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Chip Amps Amplifiers based on integrated circuits

Spice Model TDA2040
Spice Model TDA2040
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Old 30th September 2011, 03:07 AM   #1
Tubekwk is offline Tubekwk
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Default Spice Model TDA2040


I am about to build some test equipment and was considering using a TDA2040 in the output. My concern was the stability at unity gain. Has anybody a spice model for a TDA2040 or TDA2030? Has anyone tried running these at unity gain?

The idea is to generate a spit supply from a 24 volt plug pack (wall wart to some) so the supply will be +/- 12 volts.

The 12 bit DAC output from a Xmega micro will supply the signal. DC to audio frequencies only. Voltage out +/- 8 maximum. Good output control at mV required so I may have digital gain control (relay Hi Lo).

Regards Ken
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Old 30th September 2011, 03:20 AM   #2
abraxalito is offline abraxalito  United Kingdom
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I created an LTSpice model of LM1876 which is quite similar. Have run TDA2030 at 6dB gain, not totally convinced about the stability yet though - you need to fit a series RC to 'bleed off' some of the excess loop gain.
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Old 2nd October 2011, 12:54 PM   #3
Tubekwk is offline Tubekwk
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HI abraxalito

Thank you for your reply, it is good to know you have ran one at 6dB of gain. I shall draw up and rout a circuit board making provision for feedback gain adjustment and also a voltage divider on the input. If you are interested I shall report back.


BTW it has taken me this long to sort out the xmega code as I'm new to the beast.
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Old 11th April 2017, 05:45 PM   #4
MINUX75 is offline MINUX75  France
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I tryed mount a TDA2030 at unity gain. It works but the sound is not good due to the lack of margin phase. A zobel network at the otput could be a good idea.
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Old 21st April 2017, 04:24 PM   #5
Kay is offline Kay  Germany
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Location: Emden
TDA2030 at unity gain,
you need a cap across the feedback resistor!
best regards
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Old 22nd April 2017, 07:23 PM   #6
Mooly is offline Mooly  United Kingdom
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Spice Model TDA2040
You could try running the chip with an increased 'noise gain'.

R2 and R3 as shown here give a signal gain of 1 (unity gain) while the chip is happy as it sees a standard feedback network arrangement. There are many variations, this is just the basic outline.
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