I'm thinking of drawing a schematic for a full bridge single supply irs2452 design,and making my own pcb,has anyone tried this chip or has a design than I can go off?,I'm thinking of doing feedback in the plus and minus input of comparator like other full bridge amps found online ,I'd power it around 80v and maybe use totem pole drivers if needed,Would anynone be interested in such a design ?Keep in mind I'm not super experienced but I have played about with a lot of switching power supplies so I understand some board layout considerations.I like this chip because it has integrated overcurrent protection and seems fairly easy to implement using irs2092 resources which are plentyful online.I will post an unfinished rough schematic below,with no values for now
You might want to check out the 'functional description'
https://www.infineon.com/cms/en/pro...screte-class-d-audio-amplifier-ics/irs2452am/
The underlying technology looks to be the same as the MA5332MS so you can get some hints from the single supply application board for this chip:
https://www.infineon.com/cms/en/pro...egrated-class-d-audio-amplifier-ics/ma5332ms/
I also collated some whatever info I could find on this chip here:
https://www.diyaudio.com/community/threads/ma5332.379537/#post-6951846
looking at your schematic I see an imediate issue that the IRF540 is pretty ancient! we live in a world of GaN etc. I'm sure you can get something with much better figure of merit than this.
https://www.infineon.com/cms/en/pro...screte-class-d-audio-amplifier-ics/irs2452am/
The underlying technology looks to be the same as the MA5332MS so you can get some hints from the single supply application board for this chip:
https://www.infineon.com/cms/en/pro...egrated-class-d-audio-amplifier-ics/ma5332ms/
I also collated some whatever info I could find on this chip here:
https://www.diyaudio.com/community/threads/ma5332.379537/#post-6951846
looking at your schematic I see an imediate issue that the IRF540 is pretty ancient! we live in a world of GaN etc. I'm sure you can get something with much better figure of merit than this.
Thanks for the response,I selected Irf540 because that's the first 100v n type that came to mind,exact values are not final,I will look into what you sent me and report back with a more complete schematic!
here is a slightly more complete schematic,still no values but i'm wondering if I have to take feedback from both sides of the bridge or if one is enough,I'm using the internal btl mode so I don;t use input 2
see this post for how Infineon do it and my comments: https://www.diyaudio.com/community/threads/ma5332.379537/#post-6852026
I would consider the full bridge amplifier as two half bridge amplifiers (one driven with the inverse signal of the other) and take feedback from both sides. In my designs I always use a differential output OPAMP or FDA as the input stage to ensure correct driving of the two sides of the amplifier. If you look at the schematics of any amplifier with a 'bridge' mode switch you will see various schemes though. I would also use an external clock to ensure synchronization to a common clock for the two amplifiers otherwise there will be a tendency for weird 'beat' effects caused by oscilation frequency mismatch between the two amplifiers. How to do this is detailed in the functional description document.
Unrelated and more of a personal preference thing; if you use labels in your schematics rather than joining everything with lines they can be far more readable. Often if I'm trying to understand a circuit the first thing I do is redraw the schematic.
Your project is making me want to do some electronics ha; I have far too many projects. I did prototype an IRS4301 full bridge board but never got it to a fully working state as the MA5332 was released which meant continuing with the IRS4301 was pointless and I became very busy. My prototype used a mix of aluminimum single sided boards and conventional two layer boards to try and get much more power out the chips but this radical construction turned out to be a bit to radical (soldering the aluboard to the carrier conventional PCB was barley posible with an 80W metcal iron). When I get round to it I will do a thin 4 layer PCB for the MA5332.
Unrelated and more of a personal preference thing; if you use labels in your schematics rather than joining everything with lines they can be far more readable. Often if I'm trying to understand a circuit the first thing I do is redraw the schematic.
Your project is making me want to do some electronics ha; I have far too many projects. I did prototype an IRS4301 full bridge board but never got it to a fully working state as the MA5332 was released which meant continuing with the IRS4301 was pointless and I became very busy. My prototype used a mix of aluminimum single sided boards and conventional two layer boards to try and get much more power out the chips but this radical construction turned out to be a bit to radical (soldering the aluboard to the carrier conventional PCB was barley posible with an 80W metcal iron). When I get round to it I will do a thin 4 layer PCB for the MA5332.
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I Changed the feedback to the style used in the ma5332 pdf,and disabled bridge mode,this would require as you have said a fda,the 2452 has internal clock sync,I screw around a lot with leds which use aluminium substrate which requires the board to be properly preheated at first(think heat gun or hot plate),I agree I could have made a better schematic,but redrawing it really made me understand it better,I think i'll put this project on hold for a while since getting the parts is quite costly and I can't get them locally,so I might explore designs with common parts,it's quite a learning curve for me to draw schematics and pcb since I mostly modify stuff and rarely make my own designs from scratch.I think i'll try to implement over current limiters into standard designs like irs900d from this forum and give up and use a split supply.I wanted to use a single supply to be able to use a buck converter to power other amps like tpa3116.Basically what i;m trying to build is an amplifier integrated into a computer which handles crossover and eq,and just hook power and speakers and be ready to go.Anyways thanks for tuning in and responding and i'll post around here whenever I have something ready to go,I want to give back to the diy community
Its a tricky time to do anything with electronics, I'm a profesional and I dread having to build anything electronics. All these class-D IC's are actualy not super complicated so it might be worth building their functionality in simulation and then building your own amp out of common parts rather than using special IC's. Ltspice is good for switching simulations once you get a handle on all the usage of VCVS blocks etc. Also the Hypex UcD is out of patent if you want to build other self oscillating loops!