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Class D Switching Power Amplifiers and Power D/A conversion

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Old 17th April 2013, 05:04 AM   #3431
paskal9 is offline paskal9  Malaysia
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Location: the tropics with 97% humidity
Quote:
Originally Posted by ChocoHolic View Post

Definitely one of the preferable types for classD.
Besides low gate charge and low RDSon it has a good body diode with low Qrr and also IR specifies a high dv/dt rating.

From my conservative view it is fine for rails up to +/-65V.
Considering +/-65V and switching frequencies around 400kHz it can easily feed 4R loads from a half bridge and still has good headroom for impedance dips of the load.
Quote:
Originally Posted by norazmi View Post
current rating its depend what type of mosfet you are using, 20-30 amp is enough. Btw you can give a try and tell us the result.
Quote:
Originally Posted by Tekko View Post
I cannot try the IRFB4615 as i don't have any...yet.
been a while since i last stopped by.

anyway while i don't have any IRFB4615, i've been using IRFB5615 for quite a while now.
IRFB4615 150V 35A 0.039 26NC
gate charge Qg (nC)(typical/max) 26/26
trr (ns)(typical/max) 70/83
qrr (nC)(typical/max) 177/247

IRFB5615 150V 35A 0.039 26nc
gate charge Qg (nC)(typical/max) 26/40
trr (ns)(typical/max) 80/120
qrr (nC)(typical/max) 312/468

as you can see, the rated specs are quite similar, but the 5615 are sold at nearly ~50% less compared to the 4615 here. so i'm using them since they're cheaper.

i've tested running them at 800khz and they're stable at that frequency. currently they're running at ~200khz, 50V rail to 2 ohm load. got good result drawing ~1kw out of them.

previously i've even mistakenly wired them to a short and it took them around a good 10-15 second before blowing up. they're more robust compared to lower voltage mosfet that i've used before.
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Old 17th April 2013, 01:33 PM   #3432
norazmi is offline norazmi  Malaysia
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yo paskal, long time no see, yea it will need double stacked t106-2 and big coil at output. and also use good aux supply for hi power class D amp.
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Old 20th April 2013, 08:18 AM   #3433
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Default AUD600 PCB IRFP4768 Mosfet and AUD600 PCB with 2 Mosfets totem pole driver

Hello Guys


Nobody want give or share PCB files for supplier, often same with schematic, people make big secret

Detex Audio Thailand dont sell IRS amplifier Boards to me and friends,
he say, dont sell for foreigner and Thai People have foreigner friends,
crazy this guy !

I get angry this week and design AUD600 PCB by myself !
I accept to share files for PCB supplier and schematics with other DIY

Only manojtm share AUD600 schematic with me....

Have design double Layer PCB for AUD600
- add DC protect Crowbar (thanks to APEX)
- add Led for Power - Signal and Clip (thanks to APEX)


Attachments:

AUD600 PCB IRFP4768 Mosfet with Crowbar and LED Power - Signal - CLIP

AUD600 PCB with 2 x IRFP4768 Mosfets with totem pole driver, Crowbar DC protect and LED Power - Signal - CLIP
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Old 20th April 2013, 08:56 AM   #3434
khalsa is offline khalsa  India
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Insomnia very nice work
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Old 20th April 2013, 09:54 AM   #3435
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dear khalsa where to buy IRFP4768 Mosfets in india.
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pb
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Old 20th April 2013, 11:46 AM   #3436
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Im sorry but that layout is crap!! would work ok for a class AB amp but for a class D your lucky if it works somewhat properly above 20kHz switching frequency.
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Old 20th April 2013, 03:07 PM   #3437
manojtm is offline manojtm  India
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Hi Insomnia,

Thank you for using AUD600 amp

I am not discouraging you, your PCB design is not good for class D big GND loop will create more EMI in to the input and it will create cross talk when you using 2nd CH. Using Ground plane for reducing EMI
2. Use c18 close to the MOSFET for reducing EMI & RF
3. I am not suggesting crowbar for class D b'cause any issues causes in your PCB/components will create -Ve supply comes in SP line and it will damage 7414,2110 and MOSFET.

Regards
MANOJ
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Old 20th April 2013, 03:55 PM   #3438
akraj is offline akraj  Bangladesh
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Quote:
Originally Posted by manojtm View Post
Hi Insomnia,

Thank you for using AUD600 amp

I am not discouraging you, your PCB design is not good for class D big GND loop will create more EMI in to the input and it will create cross talk when you using 2nd CH. Using Ground plane for reducing EMI
2. Use c18 close to the MOSFET for reducing EMI & RF
3. I am not suggesting crowbar for class D b'cause any issues causes in your PCB/components will create -Ve supply comes in SP line and it will damage 7414,2110 and MOSFET.

Regards
MANOJ
Hi Manoj:

How about my one? MY CLASS D AMP

Please suggest me changes, I will start making code if pcb is okay. Let me know if you need DC protect schematic.

Thanks
Raj
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Old 20th April 2013, 03:58 PM   #3439
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SUCKS! No ground plane, long current loops asking for EMI galore, no good.
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Old 20th April 2013, 05:24 PM   #3440
akraj is offline akraj  Bangladesh
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Quote:
Originally Posted by Tekko View Post
SUCKS! No ground plane, long current loops asking for EMI galore, no good.
Thanks a lot for your feedback. Now please help me where to change and what?

This is single layer pcb, how to give gnd pane? How long current loops is allowable?

Thanks again.
Raj
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