Bridge Chipamp based on TDA2050 60W

[Lira]

Hi,
This time I drawed a bridge circuit for the TDA2050.
Carefull on building this circuit, the ICs get a little warm even without signal, so, before you start testing, mount it in a heatsink. Every bridge configuration using tda20xx gets a little warm without signal, so, thats quite normal.
The power and quality is good (Not great, just good), but its the best you can take on a 16v 0v 16v transformer. Built to be cheap!

Hope you like it

All the best

Lira

DIYSMPS

[Cheopps]

Old thread but simply had to reply.

some 10 years ago I played with those chips alot. The heating issue may be caused by self oscillation. Those chips tend to do it. You could try to modify output zobel network or limit input bandwith. For 4 ohm applications I have tried current boosting circuitry with additional transistors. Schematic can be found here:
http://album.ee/node/17065204/50126920

The transistors can be whatever power BJT, MOSFETs or even IGBTs(if one can find P IGBTs). R3 needs to be changed only for proper current. It has to be calculated so, that the chip current is equal to transistor current.

[Lira]

Old thread but simply had to reply.

some 10 years ago I played with those chips alot. The heating issue may be caused by self oscillation. Those chips tend to do it. You could try to modify output zobel network or limit input bandwith. For 4 ohm applications I have tried current boosting circuitry with additional transistors. Schematic can be found here:
http://album.ee/node/17065204/50126920

The transistors can be whatever power BJT, MOSFETs or even IGBTs(if one can find P IGBTs). R3 needs to be changed only for proper current. It has to be calculated so, that the chip current is equal to transistor current.

How do you calculate the R3 resistor?

Thanks for your attention.