Spice Model TDA2040

Tubekwk · 30th September 2011, 03:07 AM

Hi

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

abraxalito · 30th September 2011, 03:20 AM

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.

Tubekwk · 2nd October 2011, 12:54 PM

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.

regards
Ken

BTW it has taken me this long to sort out the xmega code as I'm new to the beast.

30th September 2011, 03:07 AM	#1
Tubekwk diyAudio Member Join Date: Jun 2010	Spice Model TDA2040 Hi 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

30th September 2011, 03:20 AM	#2
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 46	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. __________________ I think ideas are what you want to get rid of. I don't really like songs with ideas. - Leonard Cohen

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2nd October 2011, 12:54 PM	#3
Tubekwk diyAudio Member Join Date: Jun 2010	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. regards Ken BTW it has taken me this long to sort out the xmega code as I'm new to the beast.

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