Replacing AUIRF1010EZ w/ IRF3205's (SMPS)

[807tubenut]

Hey Perry, I have a few amps with the AUIRF1010EZ's in the SMPS section, Can you advise the 3205's as a drop-in?

 

[Perry Babin]

It depends on the drive circuit. What amps are they?

Why not order the originals?

 

[807tubenut]

Hifonics Titan TXi7508 is the one I have open now.

 

[Perry Babin]

I'm not familiar with that amp. What are they using for drivers?

 

[807tubenut]

A pair of 2SC2383's, and A pair of 2SA1013's per side.

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An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[Perry Babin]

I believe that the 3205s would be OK in this amp. If it's regulated and the pulse width is not 50% at idle, you need to reduce the voltage on your 12v power supply to make the duty cycle go to 50%. If the current draw increases when the duty cycle increases, you'll need to modify the circuit to make it reliable.

 

[807tubenut]

Last time I looked at this ones pwm output, it was indeed locked @ 50%

 

[Perry Babin]

Was the amp fully functional at the time?

 

[807tubenut]

Yes.

 

[Perry Babin]

If the amp was fully functional and the supply voltage was at least 12.5v and the gate drive was at 50%, it's likely unregulated and there's no need to do any additional testing. If the 3205s run cool for abut a minute out of the sink at idle, they're being switched properly.

 

[807tubenut]

indeed!

just got the amp fired up with it's new output's and 3205's in the smps, it's running with a light 1khz sine-wave load right now, nothing weird about temps thus far, and the smps is appears to run slightly cooler then the other amp with it's stock mosfet's.