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Old 28th July 2012, 10:29 PM   #1
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Default irs2092 mosfet bridging considerations

irs2092 mosfet bridging considerations

Hi I'm working on irs2092 based amplifier.
I got the amp working great in Half bridge mode at 40vdc giving around 180W@4ohms as expected.
MOsfet : IRFB4212


I read this things about Full-bridge:
  • The output power increases 4times in Full-Bridge.
  • There is a minimum LOAD to work with.
  • Mosfet Vds 1.5times for safe,How It's working at 40volts , in Full-Bridge it will be 80volt,so I have to choose a proper mosfet to deal with.
  • The Load Impedance is seen as a half of total load by the mosfet

What considerations should I have to make it work in Full-bridge mode ?

I would like to get around 400W@8ohms. and 400W@4ohms.
I can control the Voltage rails by microcontroller.

Could it be posible to use it with 4-8 ohms Load? or what should I do ?

Mosfet requirements

Vds
Id
Rds(on)
Minimum Load
Mosfet requirements

I have some IRFB4020 mosfets

regards!

Last edited by electroconico; 28th July 2012 at 10:50 PM.
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Old 28th July 2012, 11:31 PM   #2
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Bridged should be fine into 8 ohms.
You will get 400watts RMS.
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Old 29th July 2012, 02:54 AM   #3
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Quote:
Originally Posted by nigelwright7557 View Post
Bridged should be fine into 8 ohms.
You will get 400watts RMS.
Ty nigelwright.

What about using it 4-8 ohms ?
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Old 30th July 2012, 08:40 PM   #4
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Should I sync the amplifier clocks?


regards!
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Old 30th July 2012, 09:29 PM   #5
Boscoe is offline Boscoe  United Kingdom
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Quote:
Originally Posted by electroconico View Post
Should I sync the amplifier clocks?


regards!
With sufficient output filtering it shouldn't be a problem.
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Old 31st July 2012, 08:25 AM   #6
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Quote:
Originally Posted by Boscoe View Post
With sufficient output filtering it shouldn't be a problem.
Ty!

I'm just using the second order filter.

Sync terminal added.

I have some IRFB4020 mosfets.

This will be the prototype, It also include the basic protections.
DCP.UVP.OVP.

Decoupling capacitors as closes as posible.

470uF electrolitic
1uF ceramic
0.1uF ceramic
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