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Old 20th December 2012, 07:48 PM   #1
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Default Sure IRS2092 Amp Issue, Please Help

I am building a stereo amp using the Sure IRS2092 amp board along with a power supply I built myself. This is a simple linear power supply consisting of a 45+45 volt secondary toroidal transformer, a pair of rectifier bridges, and a pair of capacitor banks.

I measured the voltage using my DMM and it is putting out +/- 68 VDC. When I switch the power on to the supply/amp the amp briefly turns on for a split second (while the caps charge I assume) then turns off. When I remove the mains power the power supply caps start to discharge then the amp turns on until the caps drain down to a lower voltage.

Using crude measurement it seems that the amp operates between the voltages of 55 and 65 VDC, which is what its rated to operate at.

Now I am trying to determine if I need to get a 40+40 transformer to lower my voltages, or is there something else causing my amp to not turn on with the mains power connected to my transformer?

I am somewhat surprised that the over voltage protection would be set below 68 volts. Does anyone have any experience with this board? Any help will be greatly appreciated!
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Old 21st December 2012, 12:02 AM   #2
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Its difficult to help without the circuit diagram.

The 2092 has low voltage resets but not high.
If VCC and VAA go low the 2092 resets.

I can only guess that there is some extra circuitry that resets the 2092 if an over voltage event occurs.

I have quite a bit of experience with the 2092 having designed a few high power amplifiers but haven't seen the problem you have.

The 2092 spec says it works up to 100 volts supply so your 68 is well within spec.
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Old 21st December 2012, 02:05 AM   #3
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The Sure Electronics amp is based on the Internal Rectifiers AMP7D-200 reference design. Here is a link to that: http://www.inductor.com/irf/iraudamp7d.pdf

If you look at page 22-24 it is explained there. I am guessing that Sure used a Zener Diode with a cascade voltage right at 65 volts for "Z100".

Is there an easy way to test this Zener?
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Old 23rd December 2012, 12:58 AM   #4
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There is overvoltage protection set at 68 volts.
If you get near or over 68 volts it will trip.
Change z100 for a slightly higher value.
The 3k3 resistors on VAA and VSS will allow 20mA at 68 volts so you are on the border of what the internal zeners will take.

A better solution would be to change z100 to 75 volts and change VAA/VSS 3k3 resistors to 4K7.
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Old 20th January 2013, 08:04 PM   #5
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Quote:
Originally Posted by jdboone1986 View Post
The Sure Electronics amp is based on the Internal Rectifiers AMP7D-200 reference design. Here is a link to that: http://www.inductor.com/irf/iraudamp7d.pdf

If you look at page 22-24 it is explained there. I am guessing that Sure used a Zener Diode with a cascade voltage right at 65 volts for "Z100".

Is there an easy way to test this Zener?
Have ridden several of these and it worked well ..
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Old 27th January 2013, 06:25 PM   #6
vdij is offline vdij  Moldova
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Luizcpimenta, sorry, D3,D4 - MUR120, SF16 (1N4148, 1N4448 +-35V).
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Old 20th March 2013, 05:10 AM   #7
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Default 2092 nedd help !

Hi all !
I built irs2092 amps base on amp_7d , Vcc +/- 50v dc fo~380 khz,
Rgate 15 ohms and 5819 , coil 22uh and .47uf/250v, with no input signal , but the output have some hi frequency noise.
Can anyone help me to make it clean ?

Thanks in advance !
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