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blowing output transistor DD Z2
blowing output transistor DD Z2
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Old 7th December 2018, 12:34 AM   #31
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
This is what I mean. The yellow is the rail voltage. It comes up first, then the rail-rail oscillation begins. I think there may be an issue (on some 21844 amps) if the oscillation starts as the rail voltage is coming up. The delay allows all of the supplies to stabilize before the driver IC is enabled.
http://www.bcae1.com/temp/ampstartup01.mkv
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Old 7th December 2018, 06:33 PM   #32
yoppi is offline yoppi
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Join Date: Jan 2016
Quote:
Originally Posted by Perry Babin View Post
This is what I mean. The yellow is the rail voltage. It comes up first, then the rail-rail oscillation begins. I think there may be an issue (on some 21844 amps) if the oscillation starts as the rail voltage is coming up. The delay allows all of the supplies to stabilize before the driver IC is enabled.
http://www.bcae1.com/temp/ampstartup01.mkv
I have performed the test that indicates me. the result on all 4 sides (4 irs21844) is identical.
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File Type: mp4 WhatsApp Video 2018-12-07 at 19.30.41.mp4 (649.5 KB, 7 views)
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Old 7th December 2018, 07:41 PM   #33
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
I'm not sure what I'm seeing in your video. I don't think that the rail-rail oscillation should not start until the rail voltage is steady (I could be wrong. I've never really checked this).

The rail-rail oscillation should not go beyond the rail if you took the signal from the input to the output filter inductor.

The r-r oscillation should also be centered between the rails and not have DC.
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