Replacing AUIRF1010EZ w/ IRF3205's (SMPS)

807tubenut · 16th December 2010, 07:31 PM

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 · 16th December 2010, 10:20 PM

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

Why not order the originals?

807tubenut · 17th December 2010, 02:54 PM

Hifonics Titan TXi7508 is the one I have open now.

Perry Babin · 17th December 2010, 03:16 PM

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

807tubenut · 20th December 2010, 03:29 PM

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

Perry Babin · 20th December 2010, 03:50 PM

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 · 20th December 2010, 04:25 PM

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

Perry Babin · 20th December 2010, 04:27 PM

Was the amp fully functional at the time?

807tubenut · 05:20 PM

Yes.

Perry Babin · 20th December 2010, 07:15 PM

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.

16th December 2010, 07:31 PM	#1
807tubenut diyAudio Member Join Date: Jun 2010 Location: SinCity	Replacing AUIRF1010EZ w/ IRF3205's (SMPS) 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? __________________ All my battles have been won, But the war has just begun.

16th December 2010, 10:20 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It depends on the drive circuit. What amps are they? Why not order the originals? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

17th December 2010, 02:54 PM	#3
807tubenut diyAudio Member Join Date: Jun 2010 Location: SinCity	Hifonics Titan TXi7508 is the one I have open now. __________________ All my battles have been won, But the war has just begun.

17th December 2010, 03:16 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I'm not familiar with that amp. What are they using for drivers? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

20th December 2010, 03:29 PM	#5
807tubenut diyAudio Member Join Date: Jun 2010 Location: SinCity	A pair of 2SC2383's, and A pair of 2SA1013's per side. __________________ All my battles have been won, But the war has just begun.


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20th December 2010, 03:50 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

20th December 2010, 04:25 PM	#7
807tubenut diyAudio Member Join Date: Jun 2010 Location: SinCity	Last time I looked at this ones pwm output, it was indeed locked @ 50% __________________ All my battles have been won, But the war has just begun.

20th December 2010, 04:27 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Was the amp fully functional at the time? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

20th December 2010, 05:15 PM	#9
807tubenut diyAudio Member Join Date: Jun 2010 Location: SinCity	Yes. __________________ All my battles have been won, But the war has just begun. Last edited by 807tubenut; 20th December 2010 at 05:20 PM.

20th December 2010, 07:15 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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