Using TAS5630 Analog Input PWM Amplifier for Vocal/Keyboard Amplification?

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#1 21663172 25 Jul 2012 10:41

Leslie Perjes Leslie Perjes

Anonymous

Post #1
21663172 25 Jul 2012 10:41

I see analog input PWM amplifiers available, like TAS5630. I would like to ask if somebody tried this for amplifier design. As I see, these chips made for home theater and DVD players, but I would like to use it for vocal/keyboard amplification. Is this possible?
Datasheet: http://www.ti.com/product/tas5630
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#2 21663173 25 Jul 2012 11:03

Cody Miller Cody Miller

Anonymous

Post #2
21663173 25 Jul 2012 11:03

I noticed on TI's website that they recommend the "TAS5630b":http://www.ti.com/product/tas5630b for any new designs.

I have not used the part, but it looks like Class D amplifier so you should be able to use it for your project.
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#3 21663174 25 Jul 2012 11:13

Leslie Perjes Leslie Perjes

Anonymous

Post #3
21663174 25 Jul 2012 11:13

What is the difference the parts if one not recommended for new design? These chips recommended for home DVD/etc... systems. Maybe useful for instrument amplifications?
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#4 21663175 25 Jul 2012 13:27

Steve Lawson Steve Lawson

Anonymous

Post #4
21663175 25 Jul 2012 13:27

A part marked as "Not recommended for new design" is a part that is being phased out. If you want to use it for a "one off" design (i.e. for yourself or a friend, for example), then the impact of using such a part is low. The only drawback that I can think of is, if it fails at some later time, it might be difficult to get a replacement, so it might be wise to buy several backups.

BUT, if this is a design that you plan to put into production, then VERY not wise to use a part that is being phased out--for reasons that should be obvious. You put all that work and capital into you design and then can't get the part in the volumes you need to deliver your product to market.
#5 21663176 25 Jul 2012 13:32

Steve Lawson Steve Lawson

Anonymous

Post #5
21663176 25 Jul 2012 13:32

One other drawback that I thought of for the "one off" case is, if down the road, your design generates interest among friends and family, and they want you to make one for them, it might be a problem if you can't get the part.
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#6 21663177 25 Jul 2012 13:59

Leslie Perjes Leslie Perjes

Anonymous

Post #6
21663177 25 Jul 2012 13:59

Thanks Steve. Now I understand the NRND. But If I design PCB for TAS5630 what is NRND, I can replace with 5630b what is exactly same.

The another thing, what if I want to use this part for instrument amplification, not for home like DVD systems?
#7 21663178 25 Jul 2012 15:00

Steve Lawson Steve Lawson

Anonymous

Post #7
21663178 25 Jul 2012 15:00

Don't know if you can replace the 5630 w/ 5630b. I'd have to study the data sheets to see what is different. Also, I'd need to know what your application is. But, don't have time for that now.

Also, don't have answer for the second question, either...anybody?
#8 21663179 26 Jul 2012 03:42

Leslie Perjes Leslie Perjes

Anonymous

Post #8
21663179 26 Jul 2012 03:42

On the Ti webpage: "The device is an EXACT EQUIVALENT in functionality and parametrics to the compared device.". I think the 5630 and 5630b can be changed.

The difference between the datasheet of chips is on the page 10. The 5630 offers 2 ohm speaker impedance with clipped out signal, this is 600W. This row missing from the datasheet of 5630b, the maximum output power is 400W on 3 Ohm impedance. But 2 Ohm available with unclipped output signal with 480W, this is maybe failure?

The another difference is the output offset voltage on the page 9. This is typ/max 40/150 mV on the 5630, 20/50 mV on the 5630b what is much better.
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Topic summary

The TAS5630 is a Class D analog input PWM amplifier primarily designed for home theater and DVD player applications. It is possible to use it for vocal and keyboard amplification, but considerations include the chip's "Not Recommended for New Design" (NRND) status, indicating it is being phased out. For new designs, Texas Instruments recommends the TAS5630b, which is functionally equivalent but with some differences: the TAS5630 supports 2 Ω speaker impedance with clipped output at 600W, while the TAS5630b supports 3 Ω at 400W and 2 Ω at 480W unclipped, which may risk failure. The TAS5630b also has a lower output offset voltage (typical/max 20/50 mV) compared to the TAS5630 (40/150 mV), improving performance. Using the TAS5630 for instrument amplification is feasible, but designers should consider availability and replacement issues due to NRND status, especially for production or multiple units. PCB designs for TAS5630 can potentially be adapted for TAS5630b due to their equivalence in functionality and parametrics.
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Using TAS5630 Analog Input PWM Amplifier for Vocal/Keyboard Amplification?

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