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Xenon 11.5k amplifier output card driver
Xenon 11.5k amplifier output card driver
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Old 30th July 2017, 03:28 AM   #1
Pulse-R is offline Pulse-R  Australia
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Default Xenon 11.5k amplifier output driver card poosible fault, or error in test procedure

Hi just found this thread here.
Output driver card

Capture.PNG

What is the pwm frequency supposed to be?
I have 2kHz pwm with 0us dead time. Everything appears OK but it blows output devices. Totem poles all OK as far as I can tell.
It is the same board as rrae's picture, included above.
Thanks
Simon
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Last edited by Pulse-R; 1st August 2017 at 07:10 AM. Reason: Creation of new thread.
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Old 1st August 2017, 07:08 AM   #2
Pulse-R is offline Pulse-R  Australia
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Further to this,
The output only pops when both halves of the output are installed - i.e. each side of the amplifier is driven from one IRS21844 and 1 set of 16 totem poles.

I have used my bench supply to power up the output stage only, with +/- 39V rails and -ve Rail+12 and +/- 15V for the preamp/driver stage.
Also I put isolated 12V supply in each side for the high side driving of the IRS21844.

The totem poles have a healthy 12v (low side referenced to rail, high side referenced to output terminal).

Do I need to also connect the output to a load in the absence of the FETs?

Thanks
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Old 1st August 2017, 05:47 PM   #3
Perry Babin is offline Perry Babin  United States
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The 2k isn't the carrier frequency. Some amps will produce it and some will not, when the circuit isn't complete.

Drive a 50-100Hz signal into the amp and follow the signal to the output gate pads. I don't know this particular amp but in most amps that use similar circuits can be better tested for drive signals when the rectifiers are removed because you can have the output FETs in the circuit to load the drive circuit.
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Old 1st August 2017, 06:13 PM   #4
maurosubito is offline maurosubito
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test the amplifier with output transistor and check the drivers that drives output transistors (kta1715-ktc2814) near the driver board.
The pwm frequency is about 90 khz
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Old 2nd August 2017, 12:53 AM   #5
Pulse-R is offline Pulse-R  Australia
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Thanks guys, will do further testing later in the week.
Is there an easy way to trick the circuit to oscillating correctly?
I have put a 1nf capacitor between gate and source on a few of the pads to load the totem poles, and they still drive ok to that load.

As mentioned, it seems to work when one "pair" of fets or the other is installed, but pops when both "sides" are installed - even only one FET per totem pole set.
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Old 2nd August 2017, 01:35 AM   #6
Perry Babin is offline Perry Babin  United States
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IT won't oscillate at the normal high frequency unless the circuit is complete.

Connect a 10k resistor between pins 1 and 2 of the TL072 (wherever you can easily solder it into the circuit). Remove the rail supply and that will allow you to directly connect the scope to the output FETs with no risk to the FETs. You should see a square wave of whatever is driven to the amp at all output FETs.Having the 10k resistor will allow you to see a square wave all of the way through the circuit.
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Old 2nd August 2017, 06:02 AM   #7
Pulse-R is offline Pulse-R  Australia
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Thanks Perry,
How can I check the Dead Time with this test setup, as I think that may be the problem?
Is it as simple as ramping up the input to the TL072 to 90kHz?
The 10k resistor will be bypassing C6 feedback capactor.
(it's pin 6 + 7 on these amps, as it uses the 2nd op-amp in the package.

Thanks for your help.
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Last edited by Pulse-R; 2nd August 2017 at 06:06 AM.
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Old 2nd August 2017, 05:12 PM   #8
Perry Babin is offline Perry Babin  United States
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Unless you inject signal at the driver board, you can only use lower frequencies for testing. Low frequency testing (50-100Hz) is generally good enough to determine if all components are working as they should be.

The deadtime is determined by the 21844. If you check it, it will have to be after the 21844. I've never had the deadtime be a problem on an amp using a 21844.

OK on the 'pins 6 and 7'. I'm going by similar amps. I've never had to repair one with this driver board.
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Old 3rd August 2017, 07:07 AM   #9
Pulse-R is offline Pulse-R  Australia
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Thanks again.
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Old 14th August 2017, 09:22 PM   #10
Tom7227 is offline Tom7227  United States
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Xenon 11.5k amplifier output card driver Send a message via AIM to Tom7227
Is there a schematic for this driver board some where?
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