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Old 16th June 2011, 03:06 AM   #1
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Default TDA7293 Bridge Parallel Circuit

Hello, I want to make TDA7293 Bridge/Parallel Amp (as like BPA200 LM3886 Amp).
TDA7293 datasheet show parallel circuit & TDA7294 datasheet show bridge circuit.

I want to know about TDA7294 bridge circuit where capacitor in series with 680 ohm resistor is not connected & why 22k ohm resistor connected between inverting pin of one chip and output pin of another chip.

If i use same bridge circuit of TDA7294 in TDA7293 than what change must be done. If i connect bootstrap pin with bootstrap loader pin than a capacitor is required or not in series with 680 ohm resistor.

I want to use TDA7293 in Parallel because these not reruired precision resistor value for gain setting in parallel mode. (as like BPA200)

BPA200
TDA7293
TDA7294

Please answer. Thanks
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Old 16th June 2011, 03:52 AM   #2
lithoc is offline lithoc  Malaysia
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I think you can't use parallel configuration mode after you bridge.

You need external circuit to bridge the circuit if you really need to parallel those chips.

For TDA7293, there's master & slave mode for multiple parallel chips

IMHO,
>= 8ohm speaker, better stick with TDA7294 bridge mode (can obtain >150w easily)

<= 4ohm go for parallel mode in TDA7293 (with +-40v , can get >150w )

Last edited by lithoc; 16th June 2011 at 03:55 AM.
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Old 16th June 2011, 05:06 AM   #3
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Quote:
Originally Posted by lithoc View Post
I think you can't use parallel configuration mode after you bridge.

You need external circuit to bridge the circuit if you really need to parallel those chips.

For TDA7293, there's master & slave mode for multiple parallel chips

IMHO,
>= 8ohm speaker, better stick with TDA7294 bridge mode (can obtain >150w easily)

<= 4ohm go for parallel mode in TDA7293 (with +-40v , can get >150w )

I am no chipamp expert but the BPA-200 is a bridged parallel amplifier and I dont see why either one of them can't be used in that mode.

jer
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Old 16th June 2011, 05:58 AM   #4
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Thanks for your suggestion.
But my question is about, how connect TDA7293 into bridge mode. As like TDA7294
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Old 16th June 2011, 07:29 AM   #5
Dxvideo is offline Dxvideo  Turkey
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There is a simple way to connect them as BTL mode. However its not practical because of the input impedance..

So the second (and the robust) way is to use a bridge adaptor like this;

- Make two identical TDA7293 amplifier (refer to TDA7293 datasheet page 1),
- Connect the first amplifiers input to the bridge adaptors +OUT,
- Connect the second amplifiers input to the bridge adaptors -OUT..
- Connect the speakers + pole to the first amplifiers out and -pole to the second amplifiers out.
Thats all.

To make a BPA 200 like amplifier with TDA7293s. Then make two identical modular amplifier (TDA7293 datasheet page 10 figure 7) and use bridge adaptor before them as discripted..
...
Not at all..
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Last edited by Mooly; 22nd June 2014 at 06:01 AM. Reason: E.S.P. copyright image removed.
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Old 16th June 2011, 08:09 AM   #6
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Thanks Ozgur ,
Your idea is good .
If you have any suggestion , which i asked in starting.
please tell me.

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Vikram Raj
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Old 16th June 2011, 09:33 AM   #7
Dxvideo is offline Dxvideo  Turkey
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Ok..
In TDA7294 datasheet. They show the regular way to make a BTL amp. Which is a practical solution. However I think it will be some unwanted results with multi parallel - bridge using with TDA7293..
However if you make two modular 7293 amplifiers and connect them with a bridge adapter then you will have no difficulties like that. Only thing you must concern is the bootstrap capacitor must be 22u x IC quantites, mean if you use two paralell IC per modul then you will use a 47u for bootstrap.
I think it will be a piece of cake for you..
By the way, I have made a modular amplifier with two 7293 chip several days ago. And Its very very comparable with my LM4702 or Pass F5 amplifier..
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Last edited by Dxvideo; 16th June 2011 at 09:35 AM.
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Old 16th June 2011, 09:35 AM   #8
lithoc is offline lithoc  Malaysia
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Quote:
Originally Posted by geraldfryjr View Post
I am no chipamp expert but the BPA-200 is a bridged parallel amplifier and I dont see why either one of them can't be used in that mode.

jer
BPA200 method require the chipamp configured as parallel rather than bridge. then bridge using DRV134.


IMHO, TDA7293 parallel can produce > 150W using 40V++ PSU & 4ohm speaker which is more than enough to drive big speakers.

Bridged mode a bit risky.
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Old 16th June 2011, 09:40 AM   #9
Dxvideo is offline Dxvideo  Turkey
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I am currently using a TDA7293 parallel amplifier. I could measure 250W distorted and 200W pure sinus output with +/-42v supply and 4 ohm resistive load. That means you may have a 400W RMS amplifier with just two parallel modules in BTL mode.
Of course under this condition you must consider a really robust cooling.
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Old 16th June 2011, 09:45 AM   #10
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Thanks Ozgur for help me ,

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Vikram Raj
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