Hi,
I'm currently designing a 100Vrms 50W-100W amplifier for an evacuation system. One of the issues is the output transformer which is large and heavy. To remove the need of the transformer I’m looking at using a D Class amplifier in an H Bridge configuration. The output stage would be powered from a 150Vdc supply.
It looks like 2 x IRS20124 D Class Amplifier drivers and 4 x IRF6785 Digital Audio MOSFETs might be suitable.
I also wish to use I2S (output from the MPU), and was looking at using an Audio Process chip such as the STA309A to drive the IRS20124s.
Has anybody tried doing the above or have any suggestions?
Cheers,
Hugh
I'm currently designing a 100Vrms 50W-100W amplifier for an evacuation system. One of the issues is the output transformer which is large and heavy. To remove the need of the transformer I’m looking at using a D Class amplifier in an H Bridge configuration. The output stage would be powered from a 150Vdc supply.
It looks like 2 x IRS20124 D Class Amplifier drivers and 4 x IRF6785 Digital Audio MOSFETs might be suitable.
I also wish to use I2S (output from the MPU), and was looking at using an Audio Process chip such as the STA309A to drive the IRS20124s.
Has anybody tried doing the above or have any suggestions?
Cheers,
Hugh
Interesting idea. 🙂
I guess it's a distributed system and every speaker will have its own transformer anyway.
Conceptually looks fine, in principle making an amp delivering 20 or 28V (100/4 or 100/8) should not be different to one delivering 100V.
The output would be balanced, but there are conventional PA systems doing so.
Don't anticipate any big problems, just design your output filters considering the long wiring where both capacitance and inductance will become significant, and also that they will be excellent antennas so you'll have to filter switching frequency very well.
I guess it's a distributed system and every speaker will have its own transformer anyway.
Conceptually looks fine, in principle making an amp delivering 20 or 28V (100/4 or 100/8) should not be different to one delivering 100V.
The output would be balanced, but there are conventional PA systems doing so.
Don't anticipate any big problems, just design your output filters considering the long wiring where both capacitance and inductance will become significant, and also that they will be excellent antennas so you'll have to filter switching frequency very well.
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