Spice Model TDA2040

[Tubekwk]

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]

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]

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.

 

[MINUX75]

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.

 

[Kay]

TDA2030 at unity gain,
...
you need a cap across the feedback resistor!

 

[Mooly]

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.

 

[MINUX75]

here is spice model for TDA2030 TDA2030 fur LTspice

 

[Tubekwk]

Thank you for that, spice models are always good to have.

 

[MINUX75]

there is also asy file probably for LTSPICE https://stromrichter.org/d-amp/content/images/18_2030.asy