need for tda 7264 BTL circuit

[bigcatdairy]

Dear All, I would like to build a 2-ways TDA 7264 btl as amp for sub, can anybody give me a circuit sketch cos i don't know how to design.

The tda7264 will be taken off my old home theatre system, and the datasheet you can view via http://www.datasheetcatalog.org/data...ics/mXytyq.pdf

any kinda help will be very appreciated.

[picowallspeaker]

By looking at the figure of the frequency response of the chip ,the output drops exactly from 100 Hz , so it's not a good choice for powering a sub

[bigcatdairy]

Originally Posted by picowallspeaker

By looking at the figure of the frequency response of the chip ,the output drops exactly from 100 Hz , so it's not a good choice for powering a sub

I see the output drop as you say, could you please recommend an IC or driver IC for powering a sub?
thanks in advance.

[picowallspeaker]

Me ??? I was wandering in search of a good 500 W class D amp for subwoofer duties ...

[geraldfryjr]

Originally Posted by picowallspeaker

By looking at the figure of the frequency response of the chip ,the output drops exactly from 100 Hz , so it's not a good choice for powering a sub

According to the chart the output drops less than .5db (.3db) from 100hz to 20hz.
This chip won't have any problems for sub use except that it only has an output power of 20 watts which is very limiting for subwoofer use.

jer

[sregor]

Read the print - it says with Cin = 1uF. If you want a lower cut off frequencey, use a larger input cap. And, as previously mentioned, it is only down .5 db at 20Hz, so is not a big deal to begin with. Since the feedback is internal, would require an external circuit (phase inverter) to run bridged. Also, want to keep supply to 16V for bridged operation - think 4 ohm equivalent load for each channel when bridged into 8 ohms.

[bigcatdairy]

Originally Posted by geraldfryjr

According to the chart the output drops less than .5db (.3db) from 100hz to 20hz.
This chip won't have any problems for sub use except that it only has an output power of 20 watts which is very limiting for subwoofer use.

jer

what about to use it as a driver to drive a couples of diod or mosfets?
will it work that way to compensate it's limit in output power?

[geraldfryjr]

That is a whole another topology It has been mentioned before and has been done with such chips as the LM1877.

It might be something fun to research,But if you need more power you are better off just getting a higher power chip and starting there, like the LM3886 or TDA7293 or TDA7294 or somthing.


jer

[bigcatdairy]

Originally Posted by geraldfryjr

That is a whole another topology It has been mentioned before and has been done with such chips as the LM1877.

It might be something fun to research,But if you need more power you are better off just getting a higher power chip and starting there, like the LM3886 or TDA7293 or TDA7294 or somthing.


jer

Jer:

Thanks Jer.

by the way, what's the difference between class D and class AB power sub amp?

because it seems good to use a class D power sub amp.

[bigcatdairy]

AND WHAT KINDA CLASS D IC I CAN USE FOR A POWER SUB AMP?