Author Topic: The GDT2 output of my UD 2.7C looks bad  (Read 556 times)

Offline Admiral Aaron Ravensdale

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The GDT2 output of my UD 2.7C looks bad
« on: January 08, 2024, 01:41:10 PM »
Noob needs help 🙂
Got my UD 2.7C driver back from my friend.
Soldering looks good like expected, check everything on my microscope
BUT
the GDT2 don't work porperly.
Probes connected direct to the board and I switch the probes to confirm they are OK.
Is it the driver IC UC27423 damaged or one/both Mosfets FDD8424H.
Anyone ever seen this scope picture issue before?
When I Power Up the board it draws 0.024A at 24.2V and 0.029A when I add the signals.
So it don't seems like a short.
This is when I had long 500us mesurement


This is it in detail at 10us

Offline Admiral Aaron Ravensdale

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Re: The GDT2 output of my UD 2.7C looks bad
« Reply #1 on: January 08, 2024, 03:41:48 PM »
Just check the IC UCC27243 for GDT2 input looks like the Input of GDT1


The Output is in different to GDT1 und look like this.


Is the IC damaged or something with the power line or the smal caps?

Offline Admiral Aaron Ravensdale

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Re: The GDT2 output of my UD 2.7C looks bad
« Reply #2 on: January 08, 2024, 04:00:44 PM »
Resolder IC10 with 4 coffee and my solder iron with smallest tip!
This was still a nightmare but it was a bad contact!
Everything works now \o/



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Re: The GDT2 output of my UD 2.7C looks bad
« Reply #2 on: January 08, 2024, 04:00:44 PM »

 


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