Choosing 200W class-D type

[TroelsM]

Hi.

Please forgive me if this is answered elsewhere, but things move so fast in this field.

I'm considering making a classD amp for a active speaker and the requirements will be something like this:

• 100Wrms, 200Wpeak @8Ohm, 200Wrms, 300Wpeak @4Ohm
• Double-sided homemade PCB
• Stable: as in not blowing up and killing speakers
• mid-fi performance: no need for HighEnd, as we are talking semi-PA.
• Low EMI: it will placed right next to the PSU, filters and amp for an sensitive treble-horn.
• Overcurrent-protection is probably not needed, but would be a nice feature.
• DC-protection would be big plus
• What other protection do we need for a basic classD?
• Thermal protection, limiter and distortion-indicator will be added.
• runs on unregulated or regulated LLC-smps

Ideas for implementation:

• Most likely discrete TO220 mosfets (more options than the integrated packages)
• Torroid output-inductor (because I have them)
• Maybe a seperate driver-board for the IRSXXXX ( if it would make the PCB-design better
• Ground/Vss-planes
• SMD-resistors and capacitors (1206-0805)
• Some sort of LC-filter on all connections
• A few 330uf/100V caps on board

I have a solid background in EE, basic switching knowledge and access to scopes, but lack actual up-to-date experience on classD.

Will the IRS2092 IRAUDAMP7S be the best starting point:
https://www.infineon.com/dgdl/iraudamp7s.pdf?fileId=5546d462533600a40153569addc92bfb

Any inputs are welcome.

Kind regards TroelsM

 

[astx]

The best DIY Class D design you can get:

SystemD LiteAmp

I have build a 4 channel bridged (8 amplifiers). Sounds excellent and is powerful, safety, proven.

Best regards, Toni

 

[TroelsM]

Thanks for the input. Is the schematics released? ( Too lazy to go through 70+ pages ).

 

[astx]

Yes all schematics and gerbers are released but Chocoholic hasn't added an index in his first post. Just ask him directly in the forum.

BR, Toni

 

[TroelsM]

Great! - schematics would be nice help, and the gerbers may be helpfull, but I don´t wont to copy his project 1:1. - thats too boring

Kind regards

 

[astx]

... then SystemD lite amp meets exactly your needs.
Chocoholic has given many tips and hints for pcb design too.

My 4 channel bridged "SystemD lite" based amplifier makes really fun not only at high power levels - even at 1W power level it is really a performer!.

Have fun,

Toni

 

[TroelsM]

ASTX: I would like to avoid bridge-mode to keep parts-count down. I know that there are some benefits from the bridging, but 250W/4Ohm should be doable without bridge. - especially if I can sacrifice some hifi-performance for durability.

I don´t see any ferrite-beads/LCL on the connections to LiteAmpm - but maybe the noise is kept all internal to the PCB?

Kind regards TroelsM

 

[astx]

yes 4R high power should be able with a single module. The pcb is very clever designed to minimize EMI.