H-bridge IC for digital class D

[asenapati]

Hi,

I have a model of a closed loop digital class D amplifier system for driving an 8 ohm speaker load. I want to test the system. I am planning to use FPGA for the digital portion (includes the digital filters, PWM generator etc.) and discrete components for the other analog blocks( the H-bridge and its driver) and the ADC.

I need help in finding an H-bridge and it's driver. I surfed the internet for it, but following mentioned are a few doubts.

(1) Is there any difference between H-bridge for motor control or audio application?

(2) I found a lot of H-bridge drver ICs for audio, but not any H-bridge in particular for audio application.

There is a related thread. However, mostly the members have replied on using the H-bridge driver, not about the H-bridge.
Help needed - H-bridge, ClassD output stage IC for digital amplifier - diyAudio

I need to drive 4W into an 8 ohm load. Please suggest how can I implement the class D output stage (the H-bridge driver+ the H-bridge)

Thank you.
With regards,
asenapati

 

[ledsscp7]

Texas Instruments's chips - TAS5352, TAS51** 42, 52, 62.

 

[asenapati]

Thank you 🙂

 

[asenapati]

Hi ledsscp7,

Thank you for replying.

My intended output power requirement is 4 W into an 8 ohm load. TAS5132 can deliver 25 W max Pout. This is the least Pout, I could find from an H-bridge IC. Are there any H-bridge IC available within 4 W range?

Thanks and regards,
asenapati

 

[ledsscp7]

For low output power - need low power supply TAS5132.
For example 12V.

 

[asenapati]

Yes. I can use lower supply to get lower output power.
But from the efficiency vs output power plots, efficiency is only 85% for output power of 4W in TAS5132. So, I feel that if the H-bridge is designed for a lower Pout,max , the power efficiency for my requirement would be better. Please correct me if I am wrong. And let me know if any low power H-bridge IC is available.

Thanks and regards,
asenapati

 

[fireworks]

If you only need 4W at the output, you might be able to use a driver IC and no H bridge.

 

[asenapati]

Thanks fireworks!

could you please suggest a driver IC for audio application?

 

[fireworks]

You can check the manufacturers' web sites for "low side driver".
For example:

Low-side driver | Products | TI.com

If your output stage is half bridge you can use a chip with one channel.
If it's full bridge, you can get a chip with two channels.

Good luck and let us know how it goes.

 

[asenapati]

Thank you so much fireworks!

Sure 🙂

 

[asenapati]

Can TAS5103 have dual power supply? (Can its PVDD and PGND pins be +8V and -8V respectively)?
I couldn't find any info about PGND pin voltage level in the datasheet.

 

[Pafi]

Yes. I can use lower supply to get lower output power.
But from the efficiency vs output power plots, efficiency is only 85% for output power of 4W in TAS5132.

Yes, at 18V supply voltage. But you need only 10 V, there idle loss will be significantly lower.